Preliminary FEMA Floodplain Maps Copyrighted
September 17, 2018
City of Dubuque Consent Items # 16.
ITEM TITLE: Preliminary FEMA Floodplain Maps
SUMMARY: City Manager recommending approval of a recommended
response from the City of Dubuque to the Federal
Emergency Management Agency(FEMA) regarding
correspondence from FEMA Region VI I related to
preliminary floodplain maps for the City of Dubuque.
SUGGESTED DISPOSITION: Suggested Disposition: Receive and File; Approve
ATTACHMENTS:
Description Type
Preliminary FEMA Floodplain Maps for City of City Manager Memo
Dubuque-NNM Memo
Staff Memo Staff Memo
Flood Insurance Study part 1 Supporting Documentation
Flood Insurance Study Part 2 Supporting Documentation
Preliminary FIRM maps 1 Supporting Documentation
Preliminary FIRM maps 2 Supporting Documentation
Master inset map key Supporting Documentation
Inset map - structures added Supporting Documentation
Inset maps - structures removed Supporting Documentation
Preliminary FEMA ins rate maps Supporting Documentation
Preliminary FEMA panels not being revised Supporting Documentation
Stone Valley Dri�Area FEMA map Supporting Documentation
THE CTTY OF Dubuque
�"
ui���eNe�ary
DUB E 'il��i;'
Masterpiece on the Mississippi Z°°' Z°'Z
2013 2017
TO: The Honorable Mayor and City Council Members
FROM: Michael C. Van Milligen, City Manager
SUBJECT: Preliminary FEMA Floodplain Maps for City of Dubuque
DATE: September 11, 2018
Planning Services Manager Laura Carstens recommends City Council approval of a
recommended response from the City of Dubuque to the Federal Emergency
Management Agency (FEMA) regarding correspondence from FEMA Region VII
regarding preliminary floodplain maps for the City of Dubuque.
FEMA delineates flood hazard areas in a community through flood risk zones identified
by a Flood Insurance Study report and Flood Insurance Rate Maps. The flood risk
zones determine the flood insurance requirements and floodplain development
regulations that apply in each zone.
The preliminary Flood Insurance Rate Maps for Dubuque County and the City of
Dubuque dated August 27, 2018 are being revised to reflect new data, including revised
flood hazard analysis and digital topographic data. Planning Services and Engineering
staff continually collaborate with the lowa Department of Natural Resources on ensuring
the most accurate flood maps possible for the city.
There are 236 structures in the 100-year floodplain currently. The preliminary Flood
Insurance Rate Maps will remove 49 structures from the floodplain, mostly in the North
Fork of Caffish Creek. The preliminary Flood Insurance Rate Maps will add 5 structures
to the 100-year floodplain: 4 non-residential structures at Hoot Owl Hollow Campground
off Middle Road, and 1 residence, a duplex, along West 32"d Street. The result is a net
reduction to 192 structures in the 100-year floodplain.
FEMA will contact the City of Dubuque soon to schedule a formal community
coordination meeting to discuss the revised flood hazard information, ordinance
adoption, and other frequently asked questions and concerns.
Comments from the City of Dubuque at this point in the floodplain mapping process are
limited to non-technical information, such as the city limits, street and creek names, etc.
The City's best option to recommend technical changes to FEMA is to continue the
collaboration with the lowa Department of Natural Resources.
I concur with the recommendation and respectfully request Mayor and City Council
approval.
���.1.lL�'t't*'1 �t.v,����,
Mic ael C. Van Milligen
MCVM:jh
Attachment
cc: Crenna Brumwell, City Attorney
Teri Goodmann, Assistant City Manager
Cori Burbach, Assistant City Manager
Laura Carstens, Planning Services Manager
2
Dubuque
THE CITY OF �
AII�America Clry
U B � i'i`I �''r
Maste��piece on the Mississippi z�'.Z°'Z
2013•2017
TO: Michael C. Van Milligen, City Manager
FROM: Laura Carstens, Planning Services Manager
SUBJEC7: Preliminary FEMA Floodplain Maps for City of Dubuque
DATE: September 5, 2018
INTRODUCTION
This memo transmits for City Council review and approval, a recommended response
from the City of Dubuque to the Federal Emergency Management Agency (FEMA)
regarding the enclosed correspondence from FEMA Region VII regarding preliminary
floodplain maps for the City of Dubuque. Additional supporting documentation from
FEMA, including a Flood Insurance Study, is enclosed. A series of illustrative flood
maps also is enclosed for City Council consideration.
BACKGROUND
FEMA delineates flood hazard areas in a community through flood risk zones identified
by a Flood Insurance Study report and Flood Insurance Rate Maps (FIRM), The flood
risk zones determine the flood insurance requirements and floodplain development
regulations that apply in each zone.
The FIRM identifies Special Flood Hazard Areas that have a 1% or greater chance of
flooding in any given year. Flood insurance must be purchased for structures in these
areas if a federally backed mortgage is used. These Special Flood Hazard Areas are
referred to as "the 100-year floodplain" in this memo.
The Federal government makes flood insurance available for these properties through �
the National Flood Insurance Program if the community has a floodplain management
ordinance. The City of Dubuque floodplain management regulations are part of the
Unified Development Code. The City has participated in the National Flood Insurance
Program since 1971.
DISCUSSION
The preliminary FIRM for Dubuque County and the City of Dubuque dated August 27,
2018 are being revised to reflect new data, including revised fiood hazard analysis and
digital topographic data. Planning Services and Engineering staff continually collaborate
with IDNR on ensuring the most accurate flood maps possible for the city.
1
In 2017, the City of Dubuque and the lowa Department of Natural Resources (IDNR)
collaborated on recommended updates to the existing FIRM for the City. These
recommendations were sent to FEMA.
Our recommendation to include the drainage improvements to the North Fork of Catfish
Creek, which were documented in an engineering study called a Letter of Map Revision
(LOMR), was approved by FEMA for the preliminary floodplain map.
There are 236 structures in the 100-year floodplain currently. The preliminary FIRM will
remove 49 structures from the floodplain, mostly in the North Fork of Catfish Creek. The
preliminary FIRM will add 5 structures to the 100-year floodplain: 4 non-residential
structures at Hoot Owl Hollow Campground off Middle Road, and 1 residence, a duplex,
along West 32"d Street. The result is a net reduction to 192 structures in the 100-year
floodplain.
Enclosed is a citywide inset key map that shows the locations where structures would
be removed and added with the preliminary FIRM. Inset maps show the two locations
where structures will be added and 12 locations where properties and structures will be
removed from the 100-year floodplain.
The City and IDNR recommended two map changes based on the Bee Branch
Watershed improvements to FEMA that were not incorporated into the preliminary
floodplain maps:
1. Removal of the floodplain along Kaufman Ave. and the streets around Comiskey
Park.
2. Extension of floodwall/levee system protection for the North End / Comiskey
Park area.
FEMA did not approve these recommendations because they are located in one or
more of five map panels that include the City's floodwall/levee system. Including these
changes would negate the 2011 certification of the City's floodwall/levee system. The
certification is extremely important, as it ensures protection from 0.2% of flooding or the
"500 year flood". This means these areas have minimal flood hazard which is very
beneficial to the homes, businesses, and industries protected by the floodwall/levee
system.
Enclosed is a map that shows the preliminary FIRM panels for the City of of Dubuque.
The panels shaded in orange are the five that include the floodwall/levee system. Also
enclosed is an aerial photo that shows the location of the five orange panels in relation
to the floodwall/levee system and the existing floodplain that is not being revised.
The City and IDNR also discussed with FEMA incorporating the topographic and
floodplain changes in the construction area of the intersection of U.S. Highway 20 and
the Southwest Arterial and the frontage road connection to Stone Valley Drive. In 2017,
these improvements were not far enough along to be added to the preliminary FIRM.
In 2018, the City and IDNR are requesting assistance from the lowa Department of
Transportation (IDOT) to provide as-built drawings and more definitive topographic data
2
for inclusion in the preliminary FIRM. Enclosed are a series of FEMA flood maps that
show the effective FIRM, the preliminary FIRM, and the overlap of the two FIRMS.
FEMA will contact the City of Dubuque soon to schedule a formal community
coordination meeting to discuss the revised flood hazard information, ordinance
adoption, and other frequently asked questions and concerns. The City is encouraged
to circulate the preliminary FIRM to organizations and individuals in the community
before the FEMA meeting.
Comments from the City of Dubuque at this point in the floodplain mapping process are
limited to non-technical information, such as the city limits, street and creek names, etc.
The City's best option to recommend technical changes to FEMA is to continue our
collaboration with IDNR.
RECOMMENDATiON
Staff recommends that the City Council send a response to FEMA Region VII that the
City is supportive of the collaborative floodplain mapping process involving the IDNR
which has resulted in a revised preliminary FIRM that better reflects conditions in our
community.
Enclosures
cc: Gus Psihoyos, City Engineer
Deron Muehring, Civil Engineer
Kyle Kritz, Associate Planner
Wally Wernimont, Assistant Planner
3
FL OD INSURANCE STUDY
0
VOLUME 1 OF 1
_�t- = ; - Dl1BUC�UE COUf�TY,
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� � � IOWA
�- AND INCORPORATED AREAS
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T- � �-1�
COMMUNITY NAME CID COMMUNITY NAME CID
CITY OF ASBURY 190053 CITY OF FARLEY" 190578
CITY OF BALLTOWN` 190449 CITY OF GRAF 190370
CITY OF BANKSTON` 190107 CITY OF HOLY CROSS* 190055
CITY OF BERNARD" 190028 CITY OF LUXEMBURG 190040
CITY OF CASCADE 190117 CITY OF NEW VIENNA 190121
CITY OF CENTRALIA' 190500 CITY OF PEOSTA 190079
CITY OF DUBUQUE 195180 CITY OF RICKARDSVILLE 190526
DUBUQUE COUNTY 190534 CITY OF SAGEVILLE 190122
(UNINCORPORATED AREAS)
CITY OF DURANGO 190119 CITY OF SHERRILL* 190306
CITY OF DYERSVILLE 190120 CITY OF WORTHINGTON 190123
CITY OF EPWORTH 190576 CITY OF ZW INGLE 190371
'No Special Flood Hazard Areas Identified
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REVISED:
TBD
FLOOD INSURANCE STUDY NUMBER
19061CVOOOC
Version Number 2.4.3.0
I �
TABLE OF CONTENTS
Volume 1
Paqe
SECTION 1.0— INTRODUCTION 1
1.1 The National Flood Insurance Program 1
1.2 Purpose of this Flood Insurance Study Report 2
1.3 Jurisdictions Included in the Flood Insurance Study Project 2
1.4 Considerations for using this Flood Insurance Study Report 6
SECTION 2.0— FLOODPLAIN MANAGEMENT APPLICATIONS 15
2.1 Floodplain Boundaries 15
2.2 Floodways 16
2.3 Base Flood Elevations 22
2.4 Non-Encroachment Zones 22
2.5 Coastal Flood Hazard Areas 22
2.5.1 Water Elevations and the Effects of Waves 22
2.5.2 Floodplain Boundaries and BFEs for Coastal Areas 22
2.5.3 Coastal High Hazard Areas 22
2.5.4 Limit of Moderate Wave Action 23
SECTION 3.0 — INSURANCE APPLICATIONS 23
3.1 National Flood Insurance Program Insurance Zones 23
3.2 Coastal Barrier Resources System 24
SECTION 4.0—AREA STUDIED z5
4.1 Basin Description z5
4.2 Principal Flood Problems 25
4.3 Non-Levee Flood Protection Measures 26
4.4 Levees 26
SECTION 5.0 — ENGINEERING METHODS 29
5.1 Hydrologic Analyses 29
5.2 Hydraulic Analyses 3�
5.3 Coastal Analyses 42
5.3.1 Total Stillwater Elevations 42
5.3.2 Waves 43
5.3.3 Coastal Erosion 43
5.3.4 Wave Hazard Analyses 43
5.4 Alluvial Fan Analyses 43
I
TABLE OF CONTENTS (continued)
Volume 1 (continued)
SECTION 6.0 — MAPPING METHODS 44
6.1 Vertical and Horizontal Control 44
6.2 Base Map 44
6.3 Floodplain and Floodway Delineation 45
6.4 Coastal Flood Hazard Mapping 71
6.5 FIRM Revisions 71
6.5.1 Letters of Map Amendment 71
6.5.2 Letters of Map Revision Based on Fill 71
6.5.3 Letters of Map Revision 72
6.5.4 Physical Map Revisions 72
6.5.5 Contracted Restudies 73
6.5.6 Community Map History 73
SECTION 7.0— CONTRACTED STUDIES AND COMMUNITY COORDINATION 75
7.1 Contracted Studies 75
7.2 Community Meetings 77
SECTION 8.0 —ADDITIONAL INFORMATION 79
SECTION 9.0 — BIBLIOGRAPHY AND REFERENCES 81
Fiqures
Pape
Figure 1: FIRM Panel Index 8
Figure 2: FIRM Notes to Users 9
Figure 3: Map Legend for FIRM 12
Figure 4: Floodway Schematic 17
Figure 5: Wave Runup Transect Schematic 22
Figure 6: Coastal Transect Schematic 23
Figure 7: Frequency Discharge-Drainage Area Curves 35
Figure 8: 1% Annual Chance Total Stillwater Elevations for Coastal Areas 42
Figure 9: Transect Location Map 43
Tables
Paqe
Table 1: Listing of NFIP Jurisdictions 3
Table 2: Flooding Sources Included in this FIS Report 18
Table 3: Flood Zone Designations by Community 24
Table 4: Coastal Barrier Resources System Information 24
Table 5: Basin Characteristics 25
Table 6: Principal Flood Problems 25
Table 7: Historic Flooding Elevations 26
Table 8: Non-Levee Flood Protection Measures 26
Table 9: Levees Z8
�
TABLE OF CONTENTS (continued)
Volume 1 (confinued)
Tables (continued)
Table 10: Summary of Discharges 30
Table 11: Summary of Non-Coastal Stillwater Elevations 36
Table 12: Stream Gage Information used to Determine Discharges 36
Table 13: Summary of Hydrologic and Hydraulic Analyses 38
Table 14: Roughness Coefficients 42
Table 15: Summary of Coastal Analyses 42
Table 16: Tide Gage Analysis Specifics 43
Table 17: Coastal Transect Parameters 43
Table 18: Summary of Alluvial Fan Analyses 43
Table 19: Results of Alluvial Fan Analyses 44
Table 20: Countywide Vertical Datum Conversion 44
Table 21: Stream-by-Stream Vertical Datum Conversion 44
Table 22: Base Map Sources 45
Table 23: Summary of Topographic Elevation Data used in Mapping 46
Table 24: Floodway Data 47
Table 25: Flood Hazard and Non-Encroachment Data for Selected Streams 71
Table 26: Summary of Coastal Transect Mapping Considerations 71
Table 27: Incorporated Letters of Map Change 72
Table 28: Community Map History 74
Table 29: Summary of Contracted Studies Included in this FIS Report 75
Table 30: Community Meetings 7$
Table 31: Map Repositories �9
Table 32: Additional Information 8�
Table 33: Bibliography and References 82
Exhibits
Flood Profiles Panel
Bear Creek 01 P
Bloody Run Creek 02 P
Catfish Creek 03-06 P
Cloie Branch 07-09 P
Couler Valley 10-11 P
Couler Valley Tributary 12 P
Durion Creek 13-14 P
Granger Creek 15-16 P
Hewitt Creek 17-18 P
Hewitt Creek Tributary 19 P
Little Maquoketa River 20-25 P
Middle Fork CatFish Creek 26-33 P
Mississippi River 34-35 P
North Fork Catfish Creek 36-37 Pb
North Fork Little Maquoketa River 38 P
North Fork Little Maquoketa River Tributary 39-40 P
North Fork Maquoketa River 41-45 P
North Fork Maquoketa River Tributary 46-47 P
Sherill Creek 48-49 P
South Fork Catfish Creek 50-53 P
Union Park Hollow 54-55 P
iii
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Published Separately
Flood Insurance Rate Map (FIRM)
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FLOOD INSURANCE STUDY REPORT
DUBUQUE COUNTY, IOWA
SECTION 1.0 — INTRODUCTION
1,1 The National Flood Insurance Program
The National Flood Instiu'ance Pro�'ain (NFIP) is a voluntary Pederal prog�am that enables
property owners in participating communities to purchase insw'ance pirotecrion against losses
from flooding. This insurance is designed to provide an ii�surancc aliernative to disaster
assistance to meet the escalating costs of re�airin�dan2age to buIldings aud their contents caused
by floods.
For decades, the nationa] response to floocl clisasters was generally ]imited to constnicting flood-
conti'ol works such as dams, levees, sea-walls, and tlie like, and providing disaster relief to flood
victims. This approach did not reduce losses nor did it discourage unwise clevelopment. Li sane
instances, it may have actually encouraged additional deve]opmenL To compound the problem,
t�he public generally coiild uot buy flood coverage from insurance cmn�anies, and buildiug
teclmiques to reduce flood dTmage were often overlooked.
In d�e face of moui�ting flood losses aud escalati��g costs of disaster relief to the general
taxpayers, the U.S. Cong�ess created the NF1P. The intent was to reduce future floocl damage
through commm�iry floodplain �nanagement orclinances, ai�d pro�ride �rotectiou for properry
owners against poteotial losses tturoagli an insurance mechaoisiu that requires a premium to be
paid for the protection.
Thc U.S. Congress establishe�d the NFIP on August 1, 1968, witli the passage aF the National
Flood Insur�nce Act of 1968. The NFIP was broadened and modified ��vith die passage of the
Flood Disaster Protectiai Acl of 1973 and olher legislative measw'es. It was fiirllier �nodified by
tl�e National Flood Insurance Refonn Act of 1994 and the Flood Insurance Refonn Act af 2004.
Tlie NFIP is adn�inistered by t]ie Federal Emergency Management Ageucy (FEMA), which is a
compouent of the Department of Homelaud Security(DHS).
Partici�2tion ii� the NFIP is based on an agreement betwcen loca] commm�ities and tl�e I'edera]
Govennnent If a couumtnity adopts and enforces flood�lain managetncnt regulations to reduce
future flood iisks fo new conshucGon and substantially iinproved structures in Specia] Flood
Hazard Areas (SFHAs), the Federal Gover��ment will make flood insurance available within the
commuoity as a financial protection against flood losses. The community's floodplain
inanagement regulations nmst nleet or exceed crite�ia establis6ed in accotdance with Title 44
Code of Federal Regulations (CFR)Part 60.3, 6'iten�qfor land Managem�e�zt nrid Use.
SFHAs v'e delineated on the community's Ftood Insurance Rate Mflps (PIRMs). Under the NFIP,
bnildings tliat were built befoce tl�e flood hazard was identifietl on the community's F[RMs are
generally refened to as "Pr�FIRM" buildings. �Vl�en tUe NFIP was crented, tl�e U.S. Congress
recoo�ized that insurance for Pre-FIRM buildii�gs would be prohibitively expensive if dte
pre�niums were not subsidized by tlic Pederal Gover�unenC. Congress�Iso s'ecognized that most of
tliese floodprone buildings �vere built by indivichials wl�o did not have sufficient laiowledge of the
flood l�azarcl to make iufonned decisions. Tl�e NFIP req�ires that full actuadll rztes reflecting Uie
complete floocl iisk be charged on all buildings coilsVucted or siibstantially improved on or after
1
i
the effective date of tl�e initial FIIZM for the communiry or after December 31, 1974, whichever is
later. These buildings are generally referred to as"Post-FIRM" buildiugs.
1.2 Purpose of this Flood Insurance Study Report
This Flood Insurance Study (FIS) report revises and updates infon�iation on the existence and
severity of flood l�azards for the shidy area. Tiie studies describcd in this re�ort developed flood
hazard daCa tliat will be used to establisli actuarial flood insurance rates and Yo assist conununities
in efforts to impleuient sound floodplain mauagement.
[n some staCes or conunuuities, flooclplain manageii�ent criteria or regulations may eYist that are
more restrictive than Hie minimum Federal requirements. Contact your SfaCe NFIP Coordinator to
eusure that any higl�er Siate stand�rds are included in tl�e commu��ity's regulatioos.
1.3 Jurisdictions Included in the Flood Insurance Study Project
This FIS Report covers fhe entire geographic area of Dubuque Counry, Iowa and Incoiporated
Areas.
17ie jnrisdictions that are included in ihis project area, alottg with the Commmtity Ideutification
Number (CID) for each eot�vnmiity and Che 8-digit Hydrologic Unit Codes (HUC-8) stib-basins
affectiug each, are shown in Table 1. The Flood Insurance Rate Map (FIRM) panel numUers Chat
affect each commnnity are listed. If the flood l�azard data for the communiry is not included in
this FIS Repmt, the location of that data is identified.
Tl�e location of�flood hazard data for participating coinmunities in �uultiple iurisdictions is also
indieated in the table.
Jurisdictions that have no identified SFI-IAs as of tl�e effective date of this study are indicated i❑
tbe table. Cl�a��ged conditions in these communities (such as w�banization or annesation) or the
availaUility of new scienlific or technical data aUout flood hazards could make it necessary to
detennine SFHAs in these jurisdictions in Lhe future.
�
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Table 1: Listing of NFIP Jurisdictions
If Not Induded,
HUC-S Location of Flood
Communit CID Sub-Basin s Located on FIRM Panel(s Hazard Data
CityofAsbury 190053 07060003, 19061CO215F,19061CO220F,19061CO238F,19061C0332F,
07060005 19061C0335F
CityotBalltown' 190449 07060003 19061C0100F
City ofBankston' 190107 07060003 19061CO200F
City ofBemard' 190028 07060006 19061C0525F
City ofCascade 190117 07060006 19061C0467F,19061C0486F
City ofCenValia' 190500 07060003, �g061C0330F
07060005
19061CO215F,19061CO21�F,19061CO220F,19061CO236F,
19061CO237F,19061CO238F,19061CO239F,19061CO241F,
CityofDubuque 195180 07060003, 19061CO242F,19061CO243F,19061CO244F,19061C0330F,
07060005 19061C0332F,19061C0335F,19061C0351F,19061C0352F,
19061C0354F,19061C0356F,19061C0358F, 19�61C0360F,
19061C0365F,19061C0370F
'No Special Flood Hazard Areas IdeNified
3
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Table 1: Listing of NFIP Jurisdictions(confinuedf
If Not IncWded,
HUGB Location of Flood
Communit CID Sub-Basin s �ocated on FIRM Panel s Hazard�ata
� 19061C0025F, 19061C0050F,19061C0075F,19061COt00F,
19061C0125F, 19061C0135F,19061C0145F,19061C0155F,
19061C0160F,19061C0161F,15061C0165F,19061C0170F,
19061CO200F,19061CO205F,19061CO210F, 19061CO215F,
19061CO216F,19061CO217F,19061CO220F, 19061CO230f,
19061CO235F,19061CO236F,19061CO237F, 19061CO238F,
07060003, 19061CO241F,19061CO242F,19061CO257F, 19061CO260F,
Dubuque County 07060004, �9061CO269F,19061CO270F, 19061CO276F,19061CO278F,
(Unincorporated Areas) 190'34 07060005, �g061CO280F, 19061CO285F, 19061CO288F,19061CO290F,
07060006 19061CO295F, 19061C0325F,19061C0330F,19061C0332F,
1906�C0335F, 19061C0340F,19D61C0345F,19061C0351F,
19061C0352F, 19061C0353F,19061C0354F,19061C0358F,
19061C0360F, 19061C0365F,19061C0370F,19061C0400F,
19061C0425F, 19061C0435F,19061C0445F, 19061C0455F,
19061C0460F, 19061C0465F,19061C0467F, 19061C0470F,
19061C048DF, 19061C0485F,19061C0486F, 19061C0490F,
�9061C0495F, 19061C0525F,19061C0550F
City ofDurango 190119 07060003 19061CO217F
City of Dyersville 190120 07060006 19061C0165F, 19061C0170F, 19061CO257F,19061CO260F,
19061CO276F,19061CO278F,19061CO280F,19061CO285F
Ciry of Epwodh 190576 07060003, 19061C0325F
07060006
Ciry of Farley' 190578 07060003, �g061CO285F,79061CO295F,19061C0325F
07060006
Ciry ofGraf 190370 07060003 19061C0325F,19061C0330F
CityofHolyCross' 190055 07060003, �g061C0160F,19061CO200F
07060006
Ciry ofLuxemburg 190040 07060006 19061C0155F
Ciry of New Vienna 190121 07060006 19061C0161F
'No Special Flood Hazard Areas Identified
4
Table 1: Listing of NFIP Jurisdictions(continued)
If Not Induded,
HUC-8 Location of Flood
Communit CID Sub-Basin s Located on RRM Panel s Hazard Data
CityofPeosta 190079 07060005, �g061C0330F,19061C0340F
07060006
City ot Rickardsville 190526 07060003 19061CO200F,19061CO205F
CityofSageville 190122 07060003, 19061CO230F,19061CO236F,19061CO237F
CityofSherrill� 190306 07060003 19061CO210F
CityofWorihington 190123 07060006 19061CO269F, 19061CO288F
CityofZwingle 190371 07060006 19061COS50F
'No Special Flood Hazard Areas Identified
5
1.4 Considerations for using this Flood Insurance Study Report
The NFIP encourages State and local governments to implement sound floodplain maoagemeut
programs. To assist in this endeavor, each FIS Report provides floodplain data, which may
include a combination of the fol(owing: 10-, 4-, 2-, 1-, and 0.2-percent anntiai chance flood
elevations (tUe 1% annual cha�lce flood elevation is also refen�ed to as the Base Flood Elevation
(BFE)); delineations of the 1% annual chance and 0.2% annual cliance floodplains; ai�d 1%
annual chance floodway. This infonnation is }�resented on the FIRtVi and/or in n�any componenYs
of the FIS Report, including Flood Profiles, Flooclway Data taUles, Summary of Nou-Coastal
Stillwater Elevaeious Cables, and Coastal Transect Parameteis tables (not all componei�ts may be
piavided for a specific FIS).
This section �resents important considerations for using the infoi�nation contained in this FIS
Report a�d tl�e PIRM, including cl�anges in format and coiite�t. Figures l, 2, and 3 present
infonnation that applies to using the FIRM�vith the FIS Report.
• Part or all of diis FIS Report may be revised and republished at any time. In additioi�, part
of diis FIS Report may Ue revised by a Lefter af Map Revision (LOMR), which does not
involve republication or redistribution of the FIS Report Refer to Section 6.5 of this FIS
Report for infoimafion abouC Cl�e process to revise the FIS Report aild/or FIRM.
IC is, therefore, the responsibility of the user ro consult with community officials by
contacting tlie coimnunity repository to obtain the most curretit F1S Re�ort components.
Comilmi�ities participating in tlie NFIP hava estaUlished repositoiies of flood hazard data
for floodplain man�getnent and flood iusurance purposes. Community inap repository
adclresses are provided in Table 31, "Map Repositories," within this PIS Report.
• New FIS Reports are frequently developed for nmltiple communities, such as entire
counties. A countywide FIS Report incorporates previous PIS Reports for individual
commm�ities and the unincoiporated area of the county(ifnot juiisdictional)into a single
document and supersedes those documenfs for the puiposes of the NFIP.
The initial Countywide PIS Report for Dubuque County became effective on October ]8,
2011. Refer to Table 28 for information about subsequent revisions to the FIRMs.
• Previous FIS Reports and FIRMs may have included levees that were accredited as
�roviding protection from die 1°/o annual chauce flood based on the infot7nation available
and flie inapping standards of the NFIP at(hat time. For FEMA to conti�ue to accredit the
identified levees with providing protection froin the base flood, the levees must meet the
ciiteiia of the Code of Federal Regulations, Title 44, Section 65.10 (144 CFR 65.10),
titled "Mapping of Areas Protected b�� Levee Systems."
Since tlie stah�s of levees is suUject to chanoe at airy time, the user should contact tlie
appropriate agency foi the latest inforniation regarding levees presentecl in Table 9 of this
FIS Report. For levees owned or operated by tl�e U.S Anny Coips of Engineers
(USACE), infonnatio�t may be obtained froui the USACE national levee dataUase. For all
other levees, d�e user is encouraged to contact the appropiiate local convntiility.
o FEMA has developed a Guide Io Floo�l Maps (FEMA 258) and online tutorials to assist
users in accessii2g the iufoiniation contained on the FIRM. Tliese include how to read
(
i
panels and step-by-step instructions to obtain specific infomiation. To obfain this guide
and otl�er assistance in using tl�e FIRM, visit the FF.MA Web sile at
httu'dw�vw fema Qov/online-turorials.
The FIRM Index in Figure 1 sltows the ovcrall FIRM pane] layont withiu Dubuque Couuty, and
also displays the panel nuinber and effective clate for each FIRM panel in the coiiiity. Odier
informatiov shown ou the FIRM Index includes wmmunity boundaries, tlooding sources,
watershed boundaries, and USGS �NG8 codes.
7
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8
Each FIRM panel may contain specific notes to the user that provide additional information
regarding the flood hazard data shown on that map. However, the FIRM panel does not
contain enough space to show all the notes that may be relevant in heiping to better understand
the information on the panel. Figure 2 contains the fuli list of these notes.
Figure 2: FIRM Notes to Users
NOTES TO USERS
For information and questions about this map, available products associated with this FIRM
including historic versions of this FIRM, how to order products, or the National Flood
Insurance Program in general, please call the FEMA Map Information eXchange at 1-877-
FEMA-MAP (1-877-336-2627) or visit the FEMA Map Service Center website at
http://msc.fema.gov. Available products may include previously issued Letters of Map
Change, a Flood Insurance Study Report, and/or digital versions of this map. Many of these
products can be ordered or obtained directly from the website. Users may determine the
current map date for each FIRM panel by visiting the FEMA Map Service Center website or
by calling the FEMA Map Information eXchange.
Communities annexing land on adjacent FIRM panels must obtain a current copy of the
adjacent panel as well as the current FIRM Index. These may be ordered directiy from the
Map Service Center at the number listed above.
For community and countywide map dates, refer to Table 28 in this FIS Report.
To determine if fiood insurance is available in the community, contact your insurance agent or
call the National Flood Insurance Program at 1-800-638-6620.
PRELIMINARY FIS REPORT: FEMA maintains information about map features, such as
street locations and names, in or near designated flood hazard areas. Requests to revise
information in or near designated flood hazard areas may be provided to FEMA during the
community review period, at the final Consultation Coordination Officer's meeting, or during
the statutory 90-day appeal period. Approved requests for changes will be shown on the final
printed FIRM.
The map is for use in administering the NFIP. It may not identify all areas subject to flooding,
particularly from local drainage sources of small size. Consult the community map repository
to find updated or additional flood hazard information.
BASE FLOOD ELEVATIONS: For more detailed information in areas where Base Flood
Elevations (BFEs) and/or floodways have been determined, consult the Flood Profiles and
Floodway Data and/or Summary of Stillwater Elevations tables within this FIS Report. Use
the flood elevation data within the FIS Report in conjunction with the FIRM for construction
andlorfloodplain management.
FLOODWAY INFORMATION: Boundaries of the floodways were computed at cross sections
and interpolated between cross sections. The floodways were based on hydraulic
considerations with regard to requirements of the National Flood Insurance Program.
Floodway widths and other pertinent floodway data are provided in the FIS Report for this
jurisdiction.
9
Figure 2. FIRM Notes to Users (continued)
FLOOD CONTROL STRUCTURE INFORMATION: Certain areas not in Special Flood
Hazard Areas may be protected by flood control structures. Refer to Section 4.3 "Non-Levee
Flood Protection Measures" of this FIS Report for information on flood control structures for
this jurisdiction.
PROJECTION INFORMATION: The projection used in the preparation of the map was
Universal Transverse Mercator (UTM) Zone 15N. The horizontal datum was North American
Datum 1983. Differences in datum, spheroid, projection or State Plane zones used in the
production of FIRMs for adjacent jurisdictions may result in slight positional differences in
map features across jurisdiction boundaries. These differences do not affect the accuracy of
the FIRM.
ELEVATION DATUM: Flood elevations on the FIRM are referenced to NAVD88. These flood
elevations must be compared to structure and ground elevations referenced to the same
vertical datum. For information regarding conversion between the National Geodetic Vertical
Datum of 1929 and North American Vertical Datum of 1988, visit the National Geodetic
Survey website at http://www.nqs.noaa.qov.
Local vertical monuments may have been used to create the map. To obtain current
monument information, please contact the appropriate local community listed in Table 31 of
this FIS Report.
BASE MAP INFORMATION: Base map information shown on the FIRM was provided by the
lowa Geological and Water Survey, Department of Natural Resources (DNR). For information
about base maps, refer to Section 62 "Base Map" in this FIS Report.
The map reflects more detailed and up-to-date stream channel configurations than those
shown on the previous FIRM for this jurisdiction. The floodplains and floodways that were
transferred from the previous FIRM inay have been adjusted to conform to these new stream
channel configurations. As a result, the Flood Profles and Floodway Data tables may reflect
stream channel distances that differ from what is shown on the map.
Corporate limits shown on the map are based on the best data available at the time of
publication. Because changes due to annexations or de-annexations may have occurred after
the map was published, map users should contact appropriate community officials to verify
current corporate Ilmit locations.
NOTES FOR FIRM INDEX
REVISIONS TO INDEX: As new studies are performed and FIRM panels are updated within
Dubuque County, lowa and Incorporated Areas, corresponding revisions to the FIRM Index
will be incorporated within the FIS Report to reflect the effective dates of those panels.
Please refer to Table 28 of this FIS Report to determine the most recent FIRM revision date
for each community. The most recent FIRM panel effective date will correspond to the mosl
recentindex date.
10
i �
Figure 2. FIRM Notes to Users (continued)
SPECIAL NOTES FOR SPECIFIC FIRM PANELS
This Notes to Users section was created specifically for Dubuque County, lowa and
Incorporated Areas, effective October 18, 2011.
ACCREDITED LEVEE: Check with your local community to obtain more information, such as
the estimated level of protection provided (which may exceed the 1-percent-annual-chance
level) and Emergency Action Plan, on the levee system(s) shown as providing protection for
areas on this panel. To mitigate flood risk in residual risk areas, property owners and
residents are encouraged to consider flood insurance and floodproofing or other protective
measures. For more information on flood insurance, interested parties should visit
www fema pov/national-flood-insurance-proqram.
FLOOD RISK REPORT: A Flood Risk Report(FRR) may be available for many of the flooding
sources and communities referenced in this FIS Report. The FRR is provided to increase
public awareness of flood risk by helping communities identify the areas within their
jurisdictions that have the greatest risks. Although non-regulatory, the information provided
within the FRR can assist communities in assessing and evaluating mitigation opportunities to
reduce these risks. It can also be used by communities developing or updating flood risk
mitigation plans. These plans allow communities to identify and evaluate opportunities to
reduce potential loss of life and property. However, the FRR is not intended to be the final
authoritative source of all flood risk data for a project area; rather, it should be used with other
data sources to paint a comprehensive picture of flood risk.
Each FIRM panel contains an abbreviated legend for the features shown on the maps. However,
the FIRM panel does not contain enough space to show the legend for all map features. Figure
3 shows the full legend of all map features. Note that not all of these features may appear on the
FIRM panels in Dubuque County.
11
Figure 3: Map Legend for FIRM
SPECIAL FLOOD HAZARD AREAS: The 1% annual chance flood, also known as the base flood or
100-year flood, has a 1% chance of happening or being exceeded each year. Special Flood Hazard
Areas are subject to flooding by the 1% annual chance flood. The Base Flood Elevation is the water-
surface elevation of the 1% annual chance flood. The floodway is the channel of a stream plus any
adjacent floodplain areas that must be kept f�ee of encroachment so that the 1% annual cl�ance flood
can be carried without substantial increases in flood heights. See note for specific types. If the
floodway is too narrow to be shown, a note is shown.
Special Flood Hazard Areas subject to inundation by the 1% annual
chance flood (Zones A, AE, AH, AO, AR, A99, V and VE)
zone n The flood insurance rate zone that corresponds to the 1% annual chance
floodplains. No base (1% annual chance)flood elevations (BFEs) or
depths are shown within this zone.
zone nE The flood insurance rate zone that corresponds to the 1% annual chance
floodplains. Base fiood elevations derived from the hydraulic analyses are
shown wiihin this zone, either at cross section locations or as static
whole-foot elevations that apply throughout the zone.
zone aH The flood insurance rate zone that corresponds to the areas of 1% annuat
chance shallow flooding (usually areas of ponding)where average depths
are between 1 and 3 feet. Whole-foot BFEs derived from the hydraulic
analyses are shown at selected intervals within this zone.
zone no The flood insurance rate zone that corresponds to the areas of 1%
annual chance shallow flooding (usually sheet flow on sloping terrain)
where average depths are between 1 and 3 feet. Average whole-foot
depths derived from the hydraulic analyses are shown within this zone.
zone nrt The flood insurance rate zone that corresponds to areas that were
formerly protected from the 1% annual chance flood by a flood control
system that was subsequently decertified. Zone AR indicates that the
former flood control system is being restored to provide protection from
the 1% annual chance or greater flood.
zone ass The flood insurance rate zone that corresponds to areas of the 1%
annual chance floodplain that will be protected by a Federal flood
protection system where construction has reached specified statutory
milestones. No base flood elevations or flood depths are shown within
this zone.
zone v The flood insurance rate zone that corresponds to the 1%annual chance
coastal floodplains that have additional hazards associated with storm
waves. Base flood elevations are not shown within this zone.
zone vE Zone VE is the f�ood insurance rate zone that corresponds to the 1%
annual chance coastal floodplains that have additional hazards
associated with storm waves. Base flood elevations derived from the
coastal analyses are shown within this zone as static whole-foot
elevations that apply throughout the zone.
Regulatory Floodway determined in Zone AE.
12
i
Figure 3: Map Legend for FIRM (continuedJ
OTHER AREAS OF FLOOD HAZARD
Shaded Zone X: Areas of 0.2% annual chance flood hazards and areas
of 1% annual chance flood hazards with average depths of less than 1
foot or with drainage areas less than 1 square mile.
Future Conditions 1%Annual Chance Flood Hazard -Zone X: The flood
insurance rate zone that corresponds to the 1°/o annual chance
floodplains that are determined based on future-conditions hydrology. No
base flood elevations or flood depths are shown within this zone.
Zone X Protected by Accredited Levee: Areas protected by an accredited
levee, dike or other flood control structures. See Notes to Users for
important information.
OTHER AREAS
Zone D (Areas of Undetermined Flood Hazard): The flood insurance rate
zone that corresponds to unstudied areas where flood hazards are
undetermined, but possible
NO SCREEN Unshaded Zone X: Areas determined to be outside the 0.2% annual
chance floodplain
FLOOD HAZARD AND OTHER BOUNDARY LINES
Flood Zone Boundary(white line)
- Limit of Study
Jurisdiction Boundary
Limit of Moderate Wave Action (LiMWA): Indicates the inland limit of the
area affected by waves greater than 1.5 feet
GENERALSTRUCTURES
Apueduct
cnannei Channel, Culvert, Aqueduct, or Storm Sewer
culvert
Storm Sewer
Dam
Jetty Dam, Jetty, Weir
Wei�
� Levee, Dike or Floodwall accredited or provisionally accredited to provide
protection from the 1% annual chance flood
Levee, Dike or Floodwall not accredited to provide protection from the 1%
��� °11�°° �1i11°�� � annualchanceflood.
� Bridge
Brid�e
13
Figure 3: Map Legend for FIRM (continued)
COASTAL BARRIER RESOURCES SYSTEM (CBRS)AND OTHERWISE PROTECTED AREAS
(OPA): CBRS areas and OPAs are normally located within or adjacent to Special Flood Hazard
Areas. See Notes to Users for important information.
� Coastal Barrier Resources System Area: Labels are shown to clarify
where this area shares a boundary with an incorporated area or overlaps
CBRS AREA With the floodway.
0 913 012 0 0 9
\\�\\��\
\��\\��
\\ \ Otherwise Protected Area
OTHERWISE
PROTECTED AREA
09130/2009
REFERENCE MARKERS
ZZ'� River mile Markers
i
CROSS SECTION &TRANSECT INFORMATION
� Lettered Cross Section with Regulatory Water Surface Elevation (BFE)
�\ 21.1
�cc�u� Numbered Cross Section with Regulatory Water Surface Elevation (BFE)
17.5 Unlettered Cross Section with Regulatory Water Surface Elevation (BFE)
,� - - - - - - Coastal Transect
Profile Baseline: Indicates the modeled flow path of a stream and is
-- - shown on FIRM panels for all valid studies with profiles or otherwise
established base flood elevation.
Coastal Transect Baseline: Used in the coastal flood hazard model to
___ _, represent the 0.0-foot elevation contour and the starting point for the
transect and the measuring point for the coastal mapping.
,�w ��3,�w Base Flood Elevation Line (shown for flooding sources for which no cross
sections or profile are available)
ZONE AE Static Base Flood Elevation value (shown under zone label)
(EL 16)
ZONE AO Zone designation with Depth
(DEPTH 2)
ZONE AO
(DEPTH 2) Zone designation with Depth and Velocity
(VEL 15 FPS)
14
Figure 3: Map Legend for FIRM (continued)
BASE MAP FEATURES
nnissou�i cree�. River, Stream or Other Hydrographic Feature
� ��
3�1 Interstate Highway
234 U.S. Highway
234 State Highway
2sa County Highway
nnqp�e�p,NE Street, Road, Avenue Name, or Private Drive if shown on Flood Profile
� Railroad
RAILROAD
Horizontal Reference Grid Line
— Horizontal Reference Grid Ticks
+ Secondary Grid Crosshairs
Land GI'ant Name of Land Grant
7 Section Number
R. 43 W. T. 22 N. Range, Township Number
tz76000mE Horizontal Reference Grid Coordinates (UTM)
365000 FT Horizontal Reference Grid Coordinates (State Plane)
80° 16' 52.5" Corner Coordinates(Latitude, Longitude)
SECTION 2.0 — FLOODPLAIN MANAGEMENT APPLICATIONS
2.1 Floodplain Boundaries
To provide a national standard without regional discrimination, 11�e 1% annua] chance (100-year)
flood lias Ueen adopted by PEMA Ts the Uase flood for ffoodplain mana�ement pmposes. 1'he
0.2% annual cl�auce (500-year) flood is employed to ii�dicate acldiCional areas of flood hazard i❑
the cotrununity.
Each flooding source included ii� tUe project scope has been studied and inapped using
professional eugineering and mappii�g �uetl�odologies t�liat �vere agreed upon by FEMA and
Dubuque Coui�ty as a}�propiiate ro tlie nsk level. Flood risk is evaluated based on factors sucl� as
laiown ilood liazards and projected i�upact on the built environment E�igineeriog aualyses were
}�erfoimed for each sludied flooding source to calculate itsl% amu�al cliance flood elevatioi�s;
elevations corresponding to oiher floods (e.g. 10-, 4-, 2-, 0.2-percent annual chancc, etc.) may
15
have also bccn computed for certain flooding sources. Engineering models and metl�ods are
described in detail in Section S.0 of this FIS ReporL The tuodeled elevations at cross sections
were used to de�lineate the floodplain boimdaries on the PIRM; betwee�� cross sections, the
boundaries were intetpolated using elcvation data from various sources. More info�natio�i on
specific mapping metl�ods is provided in Section 6.0 of U�is FIS Report.
Depending on tl�e accuracy of available topographic clata (Table 23), study metl�odologies
eml�loyed (Section 5.0), and flood risk, certain flooding sources may Ue mapped to show both the
1% and 0.2% annual chance (loodplain boundaries, regulatory water sw'face elevations (BFLs),
and/or a regulatory floodwny. Similarly, other flooding sources may be mapped to show only the
1% annual chauce flood�lain boundary on tl�e FIRM, withoul published water surface elevations.
In cases where the 1% and 0.2% annual chance floodplain boimdaries are close together, only tl�e
1% annua] cl�ance floodplain boundaiy is shown oii the FIRM. Fib re 3, "Map Legend for
FIRM", describes tlie flood zones that are used on the FIRMs to accounC for d�e varying levels of
flood iisk that exist alonn flooding sources within the I�roject area. Table 2 and Table 3 indicate
[he flood zone desi�iations for eacl� floodi�g source ancl each commm�ity within Dubuque
County,respectively.
Table �, "Flooding Sources Licluded in dtis FIS Report," lists each flooding source, including its
shidy limits, affected communities, inapped zone on tl�e FIRM, and the completion date of its
engineerii�g analysis from which the flood elevations on tlie FIRM and in the FIS Report were
derived. Descriptions and dates for the latest hydrologic and hydrau]ic analyses of the flooding
sources�re sl�own in Table 13. Floodplaii� boundaries for these flooding sources are showu on the
F1RM (published separately) usin� tlie symUology described in Figure 3. On the map, the l%
annual chance tloodplain conespouds to the SFHAs. The Q.2% annual chance floodplaiu sliows
ereas tUat, altliough out of the regularoiy floodplain, are still subject to flood liazards.
Small areas within the floodplain boundaiies may lie above the flood elevations but camiot Ue
slio�vn due to limitltions of the �nap scale and/or lacic of detailed topod apliic data. The
procedures to remove these areas flom the SPHA are clescribed in Sec[ion 6.5 of this FIS Report.
2.2 Floodways
Encroaclm�ent ou floodplains, sucl� as struchues and fill, reduces flood-cauying capacity,
iucreases flood lieights and velocities, and increases flood hazards in areas beyond the
encroachn�ent ifself. One aspect of noodplain management involves balaucing die economic gain
Crom floodplaii� developinent agai�st ti�e resulting increase in flood hazard.
For puiposes of Uie NFIP, a floodway is used as a tool to assist local communities in balancing
floodplain development against iucreasing flood hazaid. Widi this approach, flie area of the 1%
annnal cl�ance floodplain on a river is divided into a floodway and a floodway fiinge based on
hydraulic modeling. The floodway is the channel of a shream, plus any adjacent flood�lain areas,
that mus[ be kept free of encroacl�inent in order to catry the 1% amma] ch�nce flood. Tlie
floodway fringe is the area between the floodway and the 1% anmial chance floodplain
boundaries where eucroachment is pennitted The floodway nuist be wide enough so fliat the
floodway fringe could be couipletely obstrucCed witl�oLit increasing the water-surface elavatiov of
tlie 1% annual chance flood more [hat� 1 foot at any point. Typical relationships beriveen tl�e
Iloodway aod tUe floodway fiinge and their significance to flooclplain development are sl�own in
Figw'e 4.
16
To p�rticipat�e in fhe NFIP, Fede��al regulations reqnire communities Co limit increases caused by
encroacUment to 1.0 foot, provided thaf hazardous velocities are not produced. The floodways in
this project are preseiited to local agcncies as nlinimum standards that can be adopted directly or
that czn be used as a basis for additional floodway projects.
Figure 4: Floodway Schematic
I�---LIMIT OF FLOO�PLAM FOR UNENCftOACHEU 1%ANNUAL CHANCE FLOOD�
PLOO�WAY FLOO�WAY FLOOUWAY
FRINGE FRINGE �
STREAM
LHANNEL
FLOOD ELEVATION WHEN
GROUNO SURFACE CONFINED WITHIN FLOODWAV
" ENGROACHMENT ENCROACHMENT
C �
FILL FILL
SORCHARGE•t
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ B
A
i
AREA OF ALLOWAeLE
FlLL ENCROACHMENT;RAISING FLOOD ELEVATION
GROUN�SURFACE WILL gEFORE ENCROACHMENT
NOT CAUSE A SURCHARGE ON FLOOOPLAIN
THAT EXCEEDS THE
INDIGATED STANDAROS
LINE A-B IS THE FLOOD ELEVATION BEFORE ENCROACHMENT
LINE C-D IS THE FLOOD ELEVATION AFTER ENCftOACHMENT
'SURGMARGE NOT TO EXLEED 1.0 FOOT�FEMA REQUIREMENT)OR LESSER HEIGHT IF SPEGIFIED BY STATE OR COMMIINITY.
17
Table 2: Flooding Sources Included in this FIS Report
HUC-8 Length(mi) Area(mi�) Zone
Sub- (streams or (esNaries Floodway shown �a�e of
Floodin Source Communit Downstream Limit U s[ream Limit Basin s coastlines or ondin YIN) on RRM Anal sis
Confluence with 02 miles March
Bear Creek City of Dyersville North Fork upsVeam of 07060006 1.9 NIA Y AE 1983
Maquoketa River Railroad
City of Sageville, Approximately
Bloody Run Dubuque County Confluence with Litlle 8,900 feet March
Creek Uninwrporated MaquokelaRiver ups�reamof 07060003 1] NIA Y AE �g83
Areas conFluence
City of Dubuque, Approximately 6.6
�ubuque Counry Confluence with March
Cat(ish Creek Unincorporated Mississippi River miles upsVeam of 07060005 8.0 N/A Y AE 1983
Areas Mason Road
Dubuque County Confluence with Little Appmxima[ely 26 March
Cloie Branch Unincorporated Maquoketa River miles upstream of 07060003 2.8 N/A V AE 1983
Areas Clay Hill Road
Couler Valley Dubuque County Confluence with Little Approximate 250 07060003, March
Creek Unincorporated Maquoketa River �eet upstream 07060005 Z'� N/A Y AE 1983
Areas John Deere Road
City of Sageville, Approximately
Couler Valley Dubuque Counry Confluence with 1,040 feet 070fi0003 0.4 N/A Y AE March
Creek Tributary Unincorporated Couler Valley Creek upstream of Old 1983
Areas U.S.Highway 52
City of Appmximately
Worthing�on, DelawarelDubuque 5,900 feet March
Durion Creek Dubuque Counry County Boundary upstream from ihe 07060006 22 NIA Y AE 1983
Unincorporated conFluence of
Areas Tri6utary B
City o(Dubuque, Approximately
Granger Creek Dubuque County Confluence with 5,450 feet 07060005 4.1 NIA Y AE March
Unincorporated Cat(ish Creek upstream of 1983
Areas Unnamed Road
18
Table 2: Flooding Sources Included in this FIS Report(continuedJ
HUC-8 Length(mi) Area(mi�) Zone
Sub- (streams or (estuaries Floodway shown Date of
Roodin Source Communit Downstream Limil U stream Limit 8asin s coastlines or ondin Y/N on FlRM Anal sis
CityofDyersville, Approximately
Dubuque Counry Confluence with 4,600 feet March
HewittCreek Unincorporaled NorlhFork upstream(mm 07060006 32 NIA Y AE 1983
Areas Maquoketa River confluence of
Tribu�ary D
City of Dyersville, Approximately
Hewi[t Creek Dubuque County Confluence with 8,100 feet 07060006 1.9 NIA Y AE March
Tributary Unincorporated Hewitt Creek upstream of 12'^ 1983
Areas Street
City of Sageville, At Old Chicago, Approximately 3.3
LilOe Maquoketa Dubuque County Milwaukee,SL Paul, miles upsUeam of 07060003 126 NIA Y AE March
River Unincorporated and Pacific Railroad Hales Mill Road 1983
Areas
Approximately
Middle Fork Cif of Dubuque Confluence with 4,100 feet 07060005 S.3 N/A V AE March
Ca[fish Creek Y Catfish Creek upstream of �983
Railroad
City of Dubuque,
Mississippi River Dubuque Counry At coun�y boundary At coun�y 07060003, �7 N/A Y AE 2004
Unincorporated boundary 07�60005
Areas
Confluence with Approxima�ely
Norlh Pork Cil o(Dubuque Middle Fork Catfish 3,600 feet 07060005 1.6 N/A Y AE March
Catfish Creek Y Creek upstream 1983
University Avenue
City of Cascade, Approxima�ely 25
North Fork Dubuque Counry Confluence wi[h Little miles upstream of 07060006 18.8 NIA Y AE �une 2,
Maquokela River Unincorporated Maquoketa River State Highway 136 1995
Areas
19
I
Table 2: Flooding Sources Included in this FIS Report(continued)
HUC-8 Leng[h(mi) Area(mi�) Zone
Sub- (streams or (estuaries Floodway shown Da[e of
Floodin Source Communit Downstream Limit U stream Limit Basin s coastlines or ondin Y/N on FIRM Anal sis
North Fork Dubuque Counry Coniluence with Approximately
Unincorporated 2,840feet June 2,
Maquoketa River Areas,City of North Fork upstream of 20'" 07060006 2.1 N/A Y AE �995
Tributary Dyersville Maquokefa Rlver Avenue
City of Durango, Approximately
Sherrill Creek Dubuque County Confluence with Little 1,600 feet 07060003 0.8 N/A Y AE March
Unincorporated Maquoketa River upstream of Glen i983
Areas Dalfa Road
City of Dubuque, Approximately 800
South Fork Dubuque Counry Confluence with feet upstream of 07060005 7.5 N/A Y AE March
Calfish Creek Unincorporaled Catfish Creek County Road 1983
Areas
City of Sageville, Approximately
Union Park �ubuque County Confluence with 8,500 feet March
Nollow Creek Unincorporated Couler Valley upstream of U.S. 07060005 2.1 N/A Y AE 1983
Areas Highway 52
20
Table 2: Flooding Sources Included in this FIS Report(continued)
HUC-S Length(mi) Area(mi') Zone
Sub- (streams or (esNaries Roodway shown Date of
Roodin Source Communit Downstream Limit U stream Limi( Basin s coastlines or ondin Y/N on FIRM Anal sis
City of Asbury,
City of Wscade,
City of Dubuque,
Dubuque County
(Unincorporated
Areas),
City of Duran9o,
City of Dyersville,
City ofEpworth, 07060003,
Approximate City o(Graf, Downstream limit of Upstream limit of 07060004, 351.4 NIA N A February
Rootling Sources Ciry of Luxemburg, sWdy sWdy 07060005, 4,2014
City of New 07060006
Vienna,
Ciry of Peosta,
City of
Rickardsville,
City of Sageville,
Ciry of
Worthington,
Cit of Zwin le
21
I I
Floodway widtlis ptesented in this F[S Report�ud on tl�e PIRM were computed at cross sections.
Beriveen cross sections, tUe floodway boundaries were i�teipolated. For certain strean� segntents,
flood�vays were adjusted so tUat the amount of floodwaters conveyed on each side of Qie
floodplain would be reduced equally. The results of ihe floodway cmnputations have been
tabulated for selected cross sections and are showo in Table 24,"Floodway Data."
All floodways that �vere developed 1or this FIS project are shown on the FIRM using the
symbology described in Figure 3. In cases where the floodway and 1% annua] chance floodplain
boundaries are either close [ogetl�er or collinear, only the floodway boundary has been shown on
U�e FIRM. For infonnatiou zbout Ihe delineation of floodways on tl�e PIRM,refer to Section 63.
2.3 Base Flood Elevations
The hydraulic cliaracteristics of flooding sources wexe analyzed to provide estimates of the
elevations of floods of the selected recuireuce intervals. The [3ase Flood Elevation (BFE) is the
elevation of the 1%� amival chauce flood. Tl�ese BFEs are most comnionly rounded to fhe whole
foot, as shown on tl�e FIRM, but in certain circumstances or locations they�nay be xounded to 0.1
foot Cross secdon ]ines sl�own on the FIRM may also be labeled with the BFE rou�ded to 0.1
foot. Whole-foot BFEs derived irom engineeiing analyses that apply to coasta] areas, areas of
pondiug, or oH�er static areas with litUe elevation cl�ange may also be shown at selected inte�vals
on ilie FIRM.
Cross sections wi[h BFEs shown on the FIRM conespond to the cross sections sl�own in the
Floodway Data table and Flood Profiles in this FIS Report. BFEs are priinarily intended for flood
iosurance rating pwposes. Por construction and/or floocl�laiu m�nagemevt purposes, users are
cautioned to use tlie flood elevation data presenled in this FIS Report in conjunction with the data
shown on tl�e FIRM.
2.4 Non-Encroachment Zones
"I7iis section is not applieable to this FIS project.
2.5 Coastal Flood Hazard Areas
2.5.1 Water Elevations and the Effects of Waves
This sectioi�is not applicable to tl�is FIS project.
Figure 5: Wave Runup Transect Schematic
[Not Applicable to this Flood Risk Project]
2.5.2 Floodplain Boundaries and BFEs for Coastal Areas
This secrion is not applicable to this FIS project.
2.5.3 Coastal High Hazard Areas
This section is not applicable to this Flood Risk Project.
22
! �
Figure 6: Coastal Transect Schematic
[Not Applicable to this Flood Risk Project]
2.5.4 Limit of Moderate Wave Action
This section is not applicable to this Flood Risk Project.
SECTION 3.0 — INSURANCE APPLICATIONS
3.1 National Flood Insurance Program Insurance Zones
Por flood insurance applications, the FIRM desib ates flood iusurance rate zones as described in
Figure 3, "Map Legend for FIRM." Flood insurance zone designations are assigned to flooding
sources based on the results of tha hydraulic or coastal analyses. Iusurance agents use the zones
sliown on tl�e PIRM aud depths and base flood elevations in this FIS Report in conjanerion with
infonnation on stnicCures and thcir contents Co assign premium rates for flood insurance policies.
The 1°/o annual chance floodplain boundary corres}�onds to the boundary of the areas of special
flood l�azaids (e.g. Zones A, AE, V, VE, ctc.), aild the 0.2% annua] chance floodplain boundary
corresponels to ihe boundary of areas of addiGonal flood hazards.
TaUle 3 ]ists the flood insurance zones in the unincorporated and incorporated areas of Dubuque
Cow�ty.
23
I
i
Table 3: Flood Zone Designations by Community
Community Flaod Zone(s)
City of Asbury A, X
City of Balltown X
City of Bankston X
City of Bernard X
City of Cascade A, AE, X
City of Centralia X
City of Dubuque A, AE, X
Dubuque County A, AE,X
(Unincorporated Areas)
City of Durango AE, X
City of Dyersville A, AE, X
City of Epworth A, X
City of Farley X
Ciry of Graf A, X
City of Holy Cross X
City of Luxemburg A, X
City of New Vienna A, AE, X
City of Peosta A, X
City of Rickardsville A, X
City of Sageville AE, X
City of Sherrill X
City of Worthington A, AE, X
City of Zwingle A, X
3.2 Coastal Barrier Resources System
This section is ilot app]icaUle to this FIS project.
Table 4: Coastal Barrier Resources System Information
[Not Applicable to this Flood Risk Project]
24
� I
SECTION 4.0 — AREA STUDIED
4.1 Basin Description
TaUle 5 confains a dcscription of tl�e characteiistics of the HUC-8 sub-basins within whicU eacli
commwiity falls. Tlie taUle includes the main flooding somces within eacU basin, a Urief
description of the basin,and its di�inage area.
Table 5: Basin Characteristics
Drainage
NL'G8 Pfim2ry A�P�
HUC-8 Sub- Sub-Basin Flooding (square
Basin Name Number Source Description of Affected Area miles)
This is the Dubuque County portion
Apple-Plum of the Apple-Plum, HUC8 ID
Apple-Plum 07060005 River (07060005), which drains to the 72
Upper Mississippi-Maquoketa-Plum
River Basin
This is the Dubuque County portion
Grant-Little Grant-Little of the Grant-Little Maquoketa,
Maquoketa 07060003 Maquoketa HUCB ID (07060003), which drains 138
River to the Upper Mississippi-
Maquoketa-Plum River Basin
This is the Dubuque County portion
Maquoketa of the Maquoketa, HUC8 ID
Maquoketa 07060006 River (07060006), which drains to the 29
Upper Mississippi-Maquoketa-Plum
River Basin
This is the Dubuque County portion
of the Turkey, HUC8 ID
Turkey 07060004 Turkey River (07060004), which drains to the 562
Upper Mississippi-Maquoketa-Plum
River Basin
4.2 Principal Flood Problems
Table 6 contains a desciipuon of the principal flood problems that ]�ave been noted for Dubuque
County by flooding source.
Table 6: Principal Flood Problems
Flooding
Source Description of Flood Problems
Catfish Creek In 1876, ravine flooding killed 40 persons and caused $28,000 damage on
Catfish Creek. Serious ravine flooding in the Catfish Creek basin was
also reported in 1852, 1857, 1918, and 1919. The 1918 peak discharge
was estimated at 28,100 cfs and the 1919 flood at 13,550 cfs. Systematic
records of floods are not available for Catfish Creek and flood stages
were not given.
25
Table 6: Principal Flood Problems (continued)
Flooding
Source Description of Flood Problems
Little For the Little Maquoketa River basin, large floods were reported in 1895
Maquoketa and 1919. The largest floods in this century recorded near Durango had
River stages and discharges of 22.1 feet and 29,000 cfs in 1925, 21.7 feet
and 23,900 cfs in September 1972, 23.8 feet and 40,000 cfs in August
1972.
Mississippi For the Mississippi River, the highest flood stages and discharges were
River 26.5 feet and 306,500 cubic feet per second (cfs) in April 1965; 23.1 feet
and 231,000 cfs in 1969; and 22.8 feet and 225,000 cfs in 1975. Although
no data are available, numerous floods for the Mississippi River are
reported for the 19th century, the highest appearing to be those of May
1826, July 1876, and spring 1888.
North Fork North Fork Maquoketa River basin, periodic flooding has also been
Maquoketa reported during the 20th century. Ice jamming resulted in additional
River problems in the 1965 flood, which came within a few feet of the bridge in
the City of Cascade.
Table 7 cont�aius informarion about historic flood elevations in the coimi�unities widiiu Dubuque
County.
Table 7: Historic Flooding Elevations
[Not Applicable to this Flood Risk Project]
4.3 Non-Levee Flood Protection Measures
Table 8 contains information about non-levee flood protection measures wilhii� Dubuque Counry
such as dams,jetties, and or dikes. Levees are addressed in Section 4.4 of this FIS Report.
Table 8: Non-Levee Flood Protection Measures
[Not Applicable to this Flood Risk Project]
4.4 Levees
For purposes of tl�e NFIP, FEMA only recognizes levee systems that meet, and continue to meet,
minimum desia, oper�tio��, a�d maintenance standards diat ara cousistei�t widi comprehensive
floodplain managemeot criteria. Tlie Code of Federal Regula[ions, Title a4, Section 65.10 (44
CFR 65.10) desciibes the infonnatio�� needed for FEMA to detennine if a levee system reduces
die risk from the 1% annual chance flood. This infonnaflon must be supplied to FEMA by the
community or otl�er party when a flood risk study or restudy is couducted, when PIRMs are
revised, or upon FEMA requesC. FEMA reviews the information for tUe purpose of estaUlishing
the appropdate FIRM flood zone.
Levee systems tl�at are detennined to reduce die risk from the 1% a�mual cliance flood are
accredited by FEMA. FEMA can also �ant provisional acereditation to a levee system that was
previously accredit�ed on zn effecrive FIRM and for which FEMA is awaiting data and/or
docmuentadon to demonsh�atc compliance with Sectiou 65.10. Tliese levee systeins are refened
to as Provisionally Accredited Levees, or PALs. Provisional accreditation provides communities
and levee owners �vith a s�ecified timeframe to oUtain tl�e necessary data to confirm the levee's
certification staws. Accredited levee systems and PALs are shown on the FIRM using tUe
26
symbology shown iu Iigure 3 and i� Table 9. If the required infonnation for a PAL is not
submitted widtin ilie required ti�neframe, or if iiifoin�arion indicates that a levee system �iot
longer meets Section 65.10, FCMA will de-accredit the levee system and issue an effective FIRM
sl�owing the levee-impacted area as a SFIIA.
PEMA coordinates its pro9'aius with USACE, wlio may iilspece, maintain, and repair levee
systems. The USACE lias authority Lmder Public Law 84-99 to suppleinent local efforts to re}�air
flood control projects [hat are damaged Uy floods. Like FEMA, the USACE provides a progam
to allow public spmisors or operators lo address levee system maintenance deficiencies. Failure to
do so within tUe required timeframe results in the levee system Ueing placed in an inactive status
in the USACE Rehabilitation and Inspection Pro��am. Levee systems in an inactive status are
iiieligible for reliabilitation assislance under Yublic Law iS4-y9.
FEMA coordinated with the USACE, the local comuumifies,and other organizations to compile a
list of levees Sl�at exist within Dubuque County. Table 9, "Levees," lists all accredited levees,
PALs, and de-accredited levees shown ou the FIRM for this FIS Report. Other categories of
levees may also be included in the table. The Levee ID shown iu this table may not match
numbers based on other identification systems tl�at were listed in previous FIS Reports. Levees
identified as PALs in the table are labeled on the FIRM to indicate their provisiona] status.
Please note that the information presented in Table 9 is subject to change at airy tinie. For fli�t
reason, the latest infonnation regarding any USACE stiucture presented in the table sl�ould be
obtaii�ed by contactiug USACE and accessing the USACE National Levee Database. For levees
owned and/or operated by son�eone other than the USACE,contact tl�e local commuuity shown in
Table 31.
Please note that PEMA has identified levees in this jurisdiction tl�at]�ave no[ beeil demonstrated
by the community or levee owner to meef tlie requirements of �F4 CFR 6510 of the NFIP
regulations as ie relates to the levee's capacity to provide 1-�ercent-anuual-chance flood
proCection. As such, the existing flood hazard analysis in the affected areas has been carried
forward fiom the previously-printed effecpve FIRM �anel(s) and the area has been clearly
identified on the PIRM panel with notes and bounding lines. This has been done to inform users
that a [emporary mappi�g action has been put iu place imtil such time as FEMA is able to initiate
a new flood iisk pro,ject to apply new flood l�azard mapping procedures for leveed areas. These
Ievees oecw� on FIRM paue](s) 19061CO242F, 19061CO244F, 19061C0356F, 19061C0360F,
19061C04C7F,
?7
I
i
Table 9: Levees
Covered
Under
USACE P�84-99
Community Plooding Source Levee Location Levee Owner Levee Levee ID Program7 RRM Panel(s) Levee Status
City of Cascade North Fork Maquoketa River West Bank City of Cascade No 510559020� Yes 19061C0467F Accredited
City of Cascade North Fork Maquoketa River East Bank City of Cascade No 1701000378 No 19061C0467F Non-Accredited
City of Cascade North Fork Maquoketa River Wesl Bank City of Cascade No 5101960367 No 19061C0467F Non-Accredited
City of Cascade North Fork Maquoketa Rlver West Bank City of Cascade No 5101960369 No 19061C0467F Non-Accredited
City ot Cascade North Fork Maquoketa River West Bank City of Cascade No 5101960370 No 19061C0467F Non-Aceredited
City of Cascade North Fork Maquoketa River West Bank City of Cascade No 5101960371 No 19061C0467F Non-Accredited
City of Cascade North Fork Maquoketa River West Bank City of Cascade No 5101960372 No 19061C0467F Non-Accredited
Ciry of Cascade North Fork Maquoketa Rlver West Bank City of Cascade No 5101960373 No 19061C0467F Non-Accredited
City of Cascade North Fork Maquoketa River West Bank Ciry of Cascade No 5101960374 No 19061C0467F Non-Accredited
City of Cascade North Fork Maquoketa River West Bank City of Cascade No 5101960375 No 19061C0467F Non-Accredited
City of Cascade North Fork Maquoketa River West Bank City of Cascade No 5101960376 No 19061C0467F Non-Accredited
City oi Dubuque, 19061 CO242F,
RoyalOaks 19061CO243F,
Ciry of Dubuque Mississippi River West Bank Development No 5104090�01 Yes 19061CO244F, Accredited
Corporalion 19061 C0356F,
19061C0360F
28
SECTION 5.0 - ENGINEERING METHODS
For tlie flooding sources in [l�e communiry, standard l�ydrologic and hydraulic shidy methods
were used to determine the floodhazard dlta required £or this study. Flood events of a mag�litude
that ere expected to be equaled or exceeded at]easf once on the average cluring any 10-, 25-, 50-,
100-, or S00-year period (racwrence interval) have been selected as having special sigiiificance
for floodplain management and fox flood insurance rates. Tliese events, comu�only teimed t1�e ]0-
, 25-, 50-, ]00-, and 500-year floods, l�ave a 10-, 4-, 2-, 1-, and 0.2% ammal chance,respectively,
of being equaled or exceeded during any year.
Althougl� the recwrence interval represen[s tl�e long-fenn, average peiiod between floods of a
specific magilitude, rue floods could occm� at sliort inCervals or even within Che same year. Tl�e
risk of experiencing a rare flood increases when periods �eater than 1 year are considered. For
exainple,the risk of having a flood tl�at equals or exceeds the 100-year flood(1-percentchance of
amiva] exceedance) dming the teim of a 30-year mortgage is approximately 26-percent (abonC 3in
10); for any 90-year period, tl�e risk increases to approxiinately 60 percent(6 in 10). Tl�e ana]yses
reported herein reflect flooding potentials based on conditions existing in lUe wimnunity at the
time of completion of this smcly. Maps and flood elevations will be amended �eriodically to
reflect fiiture changes.
The engineeiing analyses described liere incorporate tlie results of previously issued Letters of
Map Change (LOMCs) lisfed in Table 27, "Incorporated Letters of Map Change", which indude
Letters of Mai� Revisimt (LOMRs). For more informaUon abouf LOMRs, refer to Section 6.5,
"PIRM Revisiotis:'
5.1 Hydrologic Analyses
PIydrolo�ic analyses were canied out to establish the �eak elevation-fiequency relationsliips for
floods of the selected recun�ence inte�vals for each flooding source studied. Hydrologic analyses
are typically}�erfonned at the watersl�ed level. Depending on factors sucl� as wa[ershed size and
shape, land use and urUanization, and natuial or man-made storage, various inodels or
methodologics may be applied. A summary of the hydrologic methods applied to clevelop the
discl�arges used iu die hyciraulic analyses for each streatn is providecl in Table 13. Greater detail
(including assumptions, analysis, aud results) is available in the archiveci project documentarion.
A summary of the discharges is provided i❑ Table 10. Prequency Discliarge-Drainage Are�
Cu�ves used [o develop the hydrologic u�odels may also Ue shown in Figure 7 for selected
flooding sources. A summary of stillwater elevations developed for non-coascal flooding sources
is provided in TaUle IL (Coastal stillwater elevatioi�s are discussed in Secfion 53 and shown iv
Table ]7.) Streain gage infonnation is�rovided in Table 12.
29
Table 10: Summary of Discharges
Peak Dischar e cfs
DrainageArea 10°/Annual 2°/Annual 1%Annual 0.2%Annual
Floodin Source Location (S uare Miies Chance Chance Chance Chance
Bear Creek A[confluence with 37.0 4,700 9,20G 11,700 20,000
North Fork
Ma uoketa River
Bloody Run Creek At confluence with 8.9 2,410 4,380 5,370 7 770
Lit�le Maquoke�a
River
CatfishCreek Atconfluencewith 70.6 8,100 15,300 19,500 32,200
Mississi i River
Atconfluencewilh q0.0 5,000 9400 11,SOD 19,500
Mlddle Fork
Catfish Creek
Upstream of ZZ 3 3,650 6,950 8,750 14,800
confluence wi�h
South Fork Catlish
Creek
Upstreamo(sWdy 182 3,400 6,450 8,200 12,180
limit
Cloie Branch At confluence with 6.5 2,480 4A20 5,370 7,670
Little Maquokela
Rlver
About 5,700 feet 5.3 2,290 4,090 4,990 7,140
upstream of
confluence with
Little Maquoketa
River
30
Table 10: Summary of Discharges(continued)
Peak Dischar e cfs
Flooding DrainageArea 10°/Annual 2%Annual 1%Annual 02°/Annual
Source Location Square Miles Chance Chance Chance Chance
Couler Valley At coniluence with
Tributar Coler Valle 0.8 675 1,060 1,230 1,625
Durion Creek Downstream
count boundar 11A 2,420 4,400 5,470 7,910
Ups�ream of
corporate limits of 6.1 1,760 3,320 4,150 6,150
Worthin ton
Granger Creek At confluence with
Catfish Creek 15.0 3,940 6,700 8,010 11,120
Just upsVeam of
confluencewilh 11.6 3,560 6,090 7,300 10,170
Tributar Q
Just upstream of
confluence with �g 3,080 5,320 6,390 8,950
Tributar R
Hewit[Creek Upsiream of Z�� 4,100 8,000 10,200 17,500
corporale limits o(
D ersville
Hewitt Creek Ups�ream of g 6 2,200 4,300 5,500 9,400
Tributary corporate limits of
D ersville
3I
I I
Table 10: Summary of Discharges(continued)
Peak Dlschar e cfs
DrainageArea '10%Annual 2%Annual t%Annual 02%Annual
Floodin Source Location Square Miles Chance Chance Chance Chance
Little Maquoketa At mouth 157 19,290 33A50 39,870 58,110
River Upstream of
confluence with
CloieBranch- 130 17,710 30,350 36,610 53,860
a e No.4145.00
Upstream of
confluence with
North Fork Little 54 5,870 8,210 9,P0 11,270
Maquoketa River-
a e No.4143.50
Middle Fork Upslream of
Catfish Creek corporate limits of 7.Z 1,g20 3,720 4,770 8,180
Cit of Dubu ue
Mississippi River At Lock&Dam 12 gp,q00 196,000 252,000 275,000 327,000
Downstream of
Lock&Dam 11 82,100 195,000 251,000 274,000 326,000
Downstream of
Lock&Dam 10 79,370 197,000 255,D00 279,000 334,OOD
North Fork Al confluence with
Calfish Creek Middle Fork q.0 1,370 2,750 3,600 6,400
Catfish Creek
32
Tabie 10: Surmm�ry oi Cischaryes(continued}
Peak Dischar e cfs
DrainageArea �0°/Annual 2%Annual 1%Annual Q2%Annual
Floodin Source Location S uare Miles Chance Chance Chance Chance
NoM1h Pork At confluence
Little with Little 70.0 13,410 22,970 27,710 40,390
Maquoketa Ma uoketa River
River Just downslream
of conFluence with
Middle Fork Little 632 �Z,800 21,940 26,470 38,580
Ma uoketa River
Just upstream of
confluence with
Middle Fork 3� 4,2�a 6,640 7,710 10,210
Ma uoketa River
Upstream study
limi4gage No. 21.6 3,630 5,730 6,650 8,810
4144.50
NoRh Pork AlconFluence
Little with North Fork
Maquoketa Little Maquoketa 5.3 2,160 3,920 4,800 6,940
RiverTributary River
About 7,500 feet
upsVeam of
confluencewith q,� 2,020 3,650 4,470 6,440
North Pork Little
Ma uoketa River
33
I �
Table 10:Summary of Discharges(continued)
Peak Dischar e cfs
Flooding DrainageArea 10%Annual 2°/Annual 1%Annual 0.2°/Annual
Source Loration (Square Miles) Chance Chance Chance Chance
North Fork Approximately
Maquoketa River 4.6 miles
downstream of
LL5. Highway p��.7 10,015 15,970 19,090 30,000
151,atthe
downstream
count boundar
Abou[5,400 feet
upstream of
Cascade 198.3 9,650 15,41'1 1$423 29,241
cor orate limits
Approximately 5
mlles downstream
of westem counry 125.0 8,112 13,181 15,895 25,678
boundar
UpsVeam of
Hewi�t Creek 44.4 4,591 7,615 9.183 15,107
About 24 miles
upstream of 372 4,165 6,934 8,361 13,800
Tributar C
About 300 feet
downsiream of
New Vienna Z8.6 3,604 6,032 7,274 12,063
cor orate limits
NoAh Fork At confluence
Maquoketa with Notlh Fork 3.9 1,560 2280 2,610 3,420
RiverTributar Ma uoketaRiver
Sherill Creek At confluence
with Little 3.8 1,850 3,400 4,180 6,090
Ma uokeia River
34
Table 10:Summary of Discharges(continued)
Peak Dischar e cfs
DrainageArea 10%Annual 2°/Annual 1%Annual 02%Annual
Floodin Source Location S uare Miles) Chance Chance Chance Chance
South Fork Upstream of
Catfish Creek corporate limits oi »q 3,130 6,100 7,800 13,500
Cit of Dubu ue
Just upstream of
Cascade Road 14.5 2,840 5,530 7,080 12,240
About 1,000 feet
downstream of �p g 2,440 4,750 6,080 10,520
U.S.Hi hwa 20
Union Park UpsUeam of Ciry of
Hollow Dubuque corporate
limits-9age No. 0.9 650 1,010 1,170 1,540
4146.00
About 300 feet
upstream of City of 0.6 540 840 970 1,280
Dubuque corpora�e
limits
Figure 7:Frequency Discharge-Drainage Area Curves
[Not Applicable to this Flood Risk Project]
35
Table 11:Summary of Non-Coastal Stillwater Elevations
Elevations(feet NAVD88)
10%Annual 4%Annual 2%Annual 1%Annual 0.2%Annual
Rooding Source Location Chance Chance Chance Chance Chance
Interior Drainage to
Levee-At Shiras City of Dubuque * ' ` 599.0 '
Avenue
Interior Drainage to
Levee-At Bee City of Dubuque ' ` ' 601.5 '
Branch
Interior Drainage to
Levee-At Ice Clry of Dubuque * ' " 600.8 "
Harbor
Harbor Interior
Drainage lo Levee City of Dubuque ' ' ' 599.5 '
-At Maus Park
'Data not available
Table 12:Siream Gage Information used to Determine Discharges
[Not Applicable to this Flood Risk Project]
36
I
5.2 Hydraulic Analyses
Analyses of Uie hydraulic charactenstics of flooding from tUe sources shidied were can'ied out to
provide estimates of the elevations of floods of the selected recurrence intervals. Base flood
elevations on tl�e FIRM represent the elevations shown on tlre Flood Profiles ancl in the Floodway
Data tables in the FIS Report Rounded wliole-foot elevarions may be showil on the FIRM in
coasta] areas, areas of ponding, and odier areas wi[h static base flood elevations. These wl�ole-
foot elevations may not exactly reflec[ the elevations derived froin the hydraulic analyses. Plood
elevations shown on the FIRM are primaiily ii�teuded for flood insurance rating pmposes. 1=or
construction and/or floodplain maiiagement puiposes, users are cautioned to use Ylie flood
e.e✓at:en data pre�erte3 in this FIS Rep�rt in coej„n�r;r�n wirh the,daia shrn�n on the FIRM. The
hydraulic analyses for d�is PIS were Uased mi unobst�tiicted flow. '1'he flood elevations shown ou
tl�e profiles are thus considered valid only if hydraulic structures remain unoUstructed, operate
properly, and do not fail.
For streams for which hydraulic analyses were based on cross sections, ]ocations of selected cross
sections are sho�vn on the Plood Profiles (Exhibit 1). Por stream seginents for wliich a floodway
was computed(Section 63),selected cross sections are also]isfed on Table 24,"Flood�vay Data"
A sununary of flie methods used in hydraulic analyses peifonned foi this project is provided in
Table 13. Roughness coefficients are provided in Table 14. Roughness coefficients are values
representing tUe fiictional resistauce water experiences when passing overland or throuoh a
channel. Tl�ey are used in The calculetions to detennine water surface elevations. Groater detail
(includi��a assumptions,analysis, and restilts)is available in the archived project documeutarion.
37
Table 13: Summary of Hydrologic and Hydraulic Analyses
Hytlrologic Hytlraulic Date Flood
Study Limils Model or Motlel or Analy=_es Zone on
Flooding Source Downstream Limit Upstream Limit Melhotl Used Methotl Usetl Comple�ed FIRM Special Consitlerations
Confluence with 02 miles USACE, Flood Hazard Investigation,
lowa Regional Slope-area March
Bear Creek North Fork upsUeam of Equations melhod 1983 AE Catfish Creek and Tributaries,Rood Plain
Maquoketa River Rallroad Information, City of Dyersville, IA, Rock
Island,Illinois,June 1973
Confluence with Approximately
Bloody Run 8,900feet lowa Regional Slope-area March
Creek LitOe Maquoketa upstream of Equations method �gg3 AE
River confluence
Approximately
Confluence wi�h 6.6 miles lowa Regional Slope-area March
Catfish Creek Mississippi River ups�ream of Equations method �gg3 AE
Mason Road
Confluence wilh Approxima[ely
2.6 miles lowa Regional Slope-area March
Cloie Branch Liltle Maquoketa upsVeam of Clay Equations method 1983 AE
River Hill Road
Confluence with Approximate 250
Couler Valley lo�va Regional Slope-area Mamh
Creek Little Maquoketa feet upstream Equations method �gg3 AE
River John Deere Road
Approximately
Couler Valley Confluence wilh 1,040 feet lowa Regional Slope-area March AE
Creek Tributary Couler Valley upsVeam of Old Equations method 1983
U.S.Highway 52
Approximately
Delaware/Dubuq 5,900 fee� lowa Regional Slope-area M2rch
Durion Creek ue Counry upstream from AE
Boundary the confluence of Equalions method 1983
Tributary 8
38
Table 13:Summary of Hydrologic and Hydraulic Analyses(continued)
Hydmlogic Hydraulic Date Rootl
SWdy Limits Motlel or Model or Analyses Zone on
Flooding Source Downstream Limit llpslream Limit Melhod Usetl Method Usetl Completetl FlRM Special Considerations
Approximately
Granger Creek ConHuence with 5,450 feet lowa Regional Slope-area March AE
Catfish Creek upstream of Equations method 1983
Unnamed Road
Approximately
Confluence with 4,600 feel lowa Regional March USACE, Rock Island District, North Fork
Hewitt Creek North Fork upstream from Equations Field Survey 1983 AE Maquoketa River and Tributaries, Rood
Maquoketa River confluence of Plain Informalion, City of Dyersville, IA
Tributary D Rock Island,Illlnois,June 1973
Approximately USACE, Rock Island District, North Fork
Hewitt Creek Confluence with 8,100 feet lowa Regional pield Survey March AE Maquoketa River and Tributaries, Flood
Tributary Hewitt Creek upstream of 12'" EquaCions 1983 Plain Informalioq City of Dyersville, IA
Street Rock Island,Illinois,June 1973
Little A�Old Chicago, Approximately
Maquoketa Milwaukee,SL 3.3 miles Log-Pearson Slope-area March AE
River Paul,and Pacifc upstream of Type III melhod 1983
Railroad Hales Mill Road
Approximately USACE, Flood Hazard Investigation,
Middle Fork Confluence with 4,100 feet lowa Regional Slope-area March AE Catfish Creek and Tributaries,Flood Plain
Wtfish Creek Catfish Creek upstream of Equations method 1983 Information, Ciry of Dyersville, IA, Rock
Railroad Island,Illinois,June 1973
Mississippi Atcounty Atcounry HE0. HEC-RAS p004 AE
River bountlary boundary HMSIHEC-1 3.1.3
Approxima�ely
Confluence wi�h 3,600 feet lowa Re ional Slo e-area March
Catf sh C eek Middle Pork upstream Equafions me�hod 1983 AE
Ca�fish Creek University
Avenue
39
Table 13:Summary of Hydrologic and Hydraulic Analyses(continued)
Hydrologic Hydraulic Date Flood
SWtly Limits Motlel or Model or Analyses Zone on
Flooding Source Downstream Limit Upstream Limit Method Used Melhod Usetl Completetl FlRM Special Considerations
North Fork Approximately
Confluence with
Little 2.5 miles Log-Pearson Slope-area June 2,
Maquoketa Little Maquoketa ups[ream of State Type III method �gg5 AE
River Rlver Highway 136
North Pork Approximately
Confluence with
Little North Fork 2,840 feel lowa Regional Slope-area June 2, AE
Maquoketa Maquoketa River upsUeam of 20'^ Equations method 1995
RiverTributary Avenue
North Fork Confluence with Approximately USACE, Rock Islaod DisUic�, NoRh Fork
1,600 feet lowa Regional March Maquoketa River and Tributaries, Rood
Maquoketa Little Maquoketa upstream of Glen Equations Field Survey 1983 AE Plain Information, City ot Dyersville, IA
River River Dalfa Road Rock Island,Illinois,June 1973
North Fork Approximalely USACE, Rock Island Dislrict, North Fork
ConFluence wilh 8W feet lowa Regional March Maquoketa River and Tributaries, Flood
Maquoketa Catfish Creek upsUeam of Equations Field Survey 1983 AE plain Information, Ciry of Dyersville, IA
River Tributary County Road Rock Island,Illinois,June 1973
Approximately
Confluence with 8,500 feet lowa Regional Slopearea March
Sherrill Creek Couler Valley upstream of U.S Equations method �gg3 AE
Highway 52
Approximately
Confluence with USACE, Flood Hazard Investigation.
Soulh Fork 2,840feet lowa Regional Slope-area March
Catfish Creek North Fork upsVeam of 20'^ Equations method �gg3 AE Catfish Creek and Tributaries,Rood Plain
Maquoketa Rlver Avenue Informalion, City of Dyersville. IA, Rock
Island,Illinois,June'1973
Confluence wilh Approximately
Union Park 1,600fee� Log-Pearson Slope-area March
Hollow Creek Little Maquoketa upstream of Glen Type III method 1983 AE
River Dalfa Road
40
Table 13:Summary of Hydrologic and Hydraulic Malyses(continued)
Hydrologic Hydraulic Date Flood
SWtlyLimits Motlelor Motlelor Anatyses Zoneon
Flooding Source Downsiream Limit Upstream Limit Method Usetl Method Usetl Comple�etl FIRM Special Considerations
For streams sludied by approximate
methods,the peak flood dlscharges were
compuled for the 10-,2-,1-and 02-
percen4annual-chance storm events
using hydrologic analyses recommended
Approximate Downstream limi� Upstream limit of HEC R4S by the lowa DepaAment of Natural
flooding of study for study for Regression 3.0.0 and February A Resources(IDNR)and Ihe lowa
approximate approximate Equa[ions hi her 4,2014 Depadment of Transportation.This
sources siudy reaches sWdy reaches 9 hydrologic analysis method indudes use
of gage information and USGS regression
equa[ions.For additional information on
the hydrologic analyses please refer to
the Technical Support Data Notebook on
Ihe MIP
41
I I
Table 14: Roughness Coefficients
Floodin Source Channel "n" Overbank "n"
Bear Creek " `
Bloody Run Creek 0.03-0.05 0.04-0.04
Caffish Creek 0.04-0.07 0.03-0.04
Cloie Branch 0.04-0.07 0.03-0.04
Couler Valley Creek 0.03-0.10 0.03-0.05
Couler Valley Creek Tributary 0.03-0.06 0.04-0.04
Durion Creek 0.03-0.06 0.03-0.04
Granger Creek 0.03-0.07 0.03-0.04
Hewitt Creek 0.05-0.10 0.04-0.07
Hewitt Creek Tributary 0.03-0.13 0.02-0.08
Little Maquoketa River 0.03-0.08 0.03-0.05
Middle Fork Caffish Creek 0.07-0.10 0.04-0.05
Mississippi River 0.03-0.12 0.02-0.03
North Fork CaKish Creek ` '
North Fork Little Maquoketa River 0.04-0.07 0.03-0.04
North Fork Little Maquoketa River 0.03-0.08 0.03-0.05
Tributar
North Fork Maquoketa River 0.03-0.11 0.03-0.06
North Fork Maquoketa RiverTributary 0.03-0.05 0.03-0.05
Sherrill Creek 0.04-0.08 0.04-0.05
South Fork Catfish Creek 0.07-0.09 0.04-0.05
Union Park Hollow Creek 0.03-0.09 0.04-0.05
Approximate flooding sources 0.03-0.05 0.02-0.15
*Data not available
5.3 Coastal Analyses
This section is not applicable to tUis Flood Risk Project.
Table 15: Summary of Coastal Analyses
[Not Applicable to this Flood Risk Project]
5.3.1 Total Stillwater Elevations
This section is not applicable to this Flood Risk Project.
figure 8: 1% Annual Chance Total Stiliwater Elevations for Coastal Areas
[Not Applicable to this Flood Risk Project]
42
I
i
Table 16: Tide Gage Analysis Specifics
[Not Applicable to this Flood Risk Project]
5.3.2 Waves
This secdon is not applicable[o this Flood Risk Project.
5.3.3 Coastal Erosion
This section is noY applicable to this Flood Risk Project.
5,3,d �IVava �iaz�r�l Analy�eS
This section is not applicable to tUis Plood Risk ProjecC.
Table 17: Coastal Transect Parameters
[Not Applicable to this Flood Risk Project]
Figure 9: Transect Location Map
[Not Applicable in this Flood Risk Project]
5.4 Alluvial Fan Analyses
This section is not applicable to this Plood Risk Pxoject.
Table 18: Summary of Alluvial Fan Analyses
[Not Applicable to this Flood Risk Project]
43
i
Table 19: ResulYs of Alluvial Fan Analyses
[Not Applicable to this Flood Risk Project]
SECTION 6.0 — MAPPING METHODS
6.1 Vertical and Horizontal Control
All FIS Repm'ts and FIRMs are refereuced to a specific vertical datum. Tite verUcal datuin
provides a starting point against which flood, ground, and structure elevations cau be referenced
and compared. Until recenUy, the standard vertica] datum used for newly crea[ed or revised PIS
Reports and FIRMs was fl�e Na[ional Geodetic Vertical Datum of 1929 (NoVD29). With the
completion of the North Ainerican Vertical Datum of 1988 (NAVD88), many FIS Reports and
FIRMs are now preparcd using NAVD88 as the referenced vertical datum.
Flood elevations shown in this FIS Report and on tlte FIRMs are referenced to NAVD88. These
flood elevations nnist be compared to suucture and ground elevations referenced to the same
vertical damm. For infonnation regardittg conversion between NGVD29 and NAVD88 or other
datum conversion,please visit tl�e National Geodetic Survey websita al�wvw.nas.noaa.gov.
Teml�orary vertical monuments are ofteu estaUlisl�ed during the preparation of a flood hazard
an�lysis for the purpose of establishing local vertical controL Although these monwnents are not
sl�own on the FIRM,they may be found in the arcl�ived project documentation associated with the
FIS Report and lhc FIRMs for this community. Interested indivicivals may contact P�MA to
aecess these data.
To obtain cunent elevation, description, and/or locztion inforniation for Uenchmarks in fhe area,
please visit the NGS website at www.ngs.noaa.gov.
The datutu conversion locations and values that �vere calculated for Dubuque County are
provided in TaUle 20.
Table 20: Countywide Vertical Datum Conversion
[Not Applicable to this Flood Risk Project]
Table 21: Stream-by-Stream Vertical Datum Conversion
[Not Applicable to this Flood Risk Project]
6.2 Base Map
The FIItMs and FIS Report for tliis project l�ave been producecl in a digital foimat. The flood
hazard infonnation was co�rverted to a Geoo'aphic Information System (GIS) forniat that meets
FEMA's FIRM database specifications and geograpUic iufoimation standards. This infornlation is
provided in a digital fonuat so that it can be incoipoiated into a local G[S and be accessed more
easily by tl�e co�muimiry. The FIRM Database includes nlost of the tabular inforniation contained
in the FIS Report in sucl� a way that tl�e data can be associated witl�peitinent s}�atial features. For
examl�le, the infonuation coutained in the Floodway Data table and Tlood Profiles cau be linked
to die cross secrions tl�at are shown on [he FIRIvIs. Aclditional inforniation about the FIRM
44
Database and it�s contents can be found in FEMA's Grude7i�aes and Stnndards for Flood Rasl;
Anal��sis and Mapping, www.fe�ua.gov/guidelines-and-standards-flood-risk-analysis-and-
mapping.
Base ma1�infonnatiou sl�own on tl�e FIRM was derived fro�u the sources descriUed in TaUle 22.
Table 22: Base Map Sources
Data Data
Data Type Data Provider Date Scale Data Description
I owa
Digital Department of 2010 1: 24,000 Base Imagery
Orthophoto Natural
Resources
lowa
General Geological 2014 1:12,000 Levee data
Structures and Water
Survey, DNR
HUC-8 U.S.
Subbasins Geological 1994 1: 24,000 Hydrologic Unit Center data
Survey
Political lowa
Township and Department of
Incorporated Natural 2010 1:12,000 Political Boundaries
City Boundaries Resources
in lowa in 2010
Public Land lowa
Survey System Department of 2002 1: 24,000 PLSS data were digitized from
(PLSS) Natural USGS quadrangles
Resources
Road lowa
centerlines Department of 2011 1: 5,000 Road and railroad line data
Transportation
6.3 Floodplain and Floodway Delineation
Tlie FIRM sl�ows tints, screens, and symbols Co indicate floodplains and flood�vays as well as die
locations of selacted cross sections used in khe hydraulic analyses and floodway computations.
Por riverinc flooding sources, the mapped floodplain boundaries sUown on the FIRM l�ave Ueen
delineated using the flood elevatiovs detenniued at each cross section; between cross sections, the
boundaries were interpolated using the topographic elevation data desciibed in Table 23.
In cases wl�ere tl�e I°/o and 0.2% aunual chance flood}�lain Uoundaries are close to�ether, only the
1% amtu�l chance floodplain bowidary has been shown. Small �reas within tl�e floodplaiu
bouudaries may lie above the flood elevations but cannot be shown due to limitatious of the map
scale aud/or]ack of detailed topograpl�ic da[a.
45
I
The floodway widtl2s presented i� this FIS Report and on the FIRM were coinputed for certain
strcam seginents on the basis of equa] conveyance reduction fi'om each side of the floodplain.
Floodway �vidths �vere computed at cross sections. Beh�een cross sectioos, the floodway
bonndaries were interpolated. Table 2 iudicates tl�e floodino sources for wliich floodways have
been determined. The resvlts of tlie floodway cou�putations for those flooding sources have been
tabulated for se]ecCed cross sections and are sUowu in Table 24,"Floodway Data."
Table 23: Summary of Topographic Elevation Data used in Mapping
Source for Topographic Elevation Data
Flooding Contour Accuracy
Community Source Description Scale Interval Citation
18.5cm lowa
(bare earth) Department
of Natural
Dubuque Light Detection and Resources
Count All Sources Ranging data N/A N/A 37cm lowa
Y LiDAR
� ) (dense Statewide
vegetation) 1 M LiDAR
Collection
BFEs sliown at cross sections on the FIRM represent tlie 1% annual chaiice water surface
elevations shown ou the Flood Profiles and in tUe Flood�vay Data tnbles in the PIS Report.
4(
Table 24: Floodway Data
FLOODING SOURCE FLOO�WAY 'I-PERCENT-ANNUAL�CHANCE FLOOD
WNTER SURFACE ELEVATION
SEGTION MEAN WITHOl1T WITN
WIDTH REGULATORV INCREASE
CROSSSECTION pISTANGE' AREA VELOQTY FLOODWAV FLOODWAV
(FEET) (SQFEET) (FEETSEC.) (FEETNAVD) (FEETNAVD) (FEETNAV�) (FEET�
BEARGREEK
A 025 680 4,330 2] 936.9 933.7� 9344� ���
B 053 460 2,680 4.1 93].� �J3S5' 936A� ��9
C 0.% 20� ip50 8.1 9374 g370� 93"!]' ���
� 089 1,030 7,050 17 9394 939A 'J40A 1.0
E 1.10 820 5,910 2.0 939.6 9396 940.6 1.0
F 1.30 6]0 5,35� 22 9404 940.4 'J41.3 09
G 1.60 655 3.510 3.3 945.0 945.0 945.1 0.1
H 1.77 515 4,400 2] 94].4 94�.4 9476 02
'MILES ABOVE CONFW ENCE WITH NORTH FOFK MA�UOAETH RIVER
°ELEVATION COMPOTED WITHOUT CONSI�ERATION OF BACKWATER EFFECTS FROM NORTH FORK MA�UOKETA RNER
� FEOERALEMERGENCYMNNAGEMENTAGENCY FLOO�WAYDATA
m DUBUQUE COUNTY, IA
ANDINCORPOR4TEDAREAS BEAR CREEK
47
I �
Table 24: Floodway�ata
FLOODING SOURCE FLOO�WAY 1-PERCENT-ANNUALCHANCE FL000
WATER SURFACE ELEVATION
WIDTH SECTION MEAN p�GUL4TORY WITHOUT WITH INCREASE
CROSSSECTION pISTANCE' AREA VELOQTY FLOO�WAV FLOODWAV
(FEET) (SO.FEET) (FEET/SEC.) (FEETNAVD) (FEETNAVD) �FEETNAVD) (FEET)
BLOODVRUN
CftEEK
A 1,890 290 1,354 4.0 6217 615.8' 616.8' 1.0
B 3890 224 1$11 44 621] 61J3� 620.3' ��
C 6 140 315 1 029 5 2 623.5 623.5 624.5 1.0
D 7,165 239 910 5.9 626.6 G266 621.6 1.0
E 8,890 64 652 82 �32.6 632.6 6336 10
FEET ABOVE CONF WENCE W ITH LITTLE MAQUOKEfA RNER
°ELEVATIONS WITHOUT CONSIOERING BACKWNTER EFFECTS FROM LITfLE b1A�UOKETA RNER
'� FE�ERFLEMEftGENCTMHNAGEMENTHGENCY
� FLOODWAY DATA
m DUBUQUE COUNTY, IA
AN�INCORPORATEDAREAS BLOODY RUN CREEK
48
I
i
Table 24: Floodway Data
i-PERCENT-NNNUAL-CHANCE FLOOD
FLOD�ING SOURCE FLOOOWAV WqTER SIIRFACE ELEVATION
SECTION MEAN REGULATORY WITHOUT WITH INCREASE
WIDTH
CROSSSECTION pISTANCE' AREA VELOCITY FLOODWAY FLOOOWAV
(FEET) (SQFEET) (FEETISEC.) (FEET NAV�) (FEET NAV�) (FEET NAVO) (FEET)
CATFISFI CREEK
A 100 1�2 2J45 9.1 609.4 598.�' 598.9' 09
B 5]� 226 1.281 152 609.4 5'J8.8� 5�J89' 0�
C 1,600 120 2086 9.3 6094 6068' 6066° 0.0
D 1,855 120 1790 10.9 609.4 6066� 606.6' 0.0
E 4,050 168 2,454 �9 610.1 610.1 610.8 0]
F 5,780 241 3,540 5.5 6120 612.0 612.9 0.9
G ]960 636 8,044 2.4 613.6 6136 6�4.6 "I.0
H 88�0 213 2,61'J ]4 6136 613.6 6146 t.0
I 11,8�0 4�4 5653 34 616] 616] 6176 09
J 15,065 435 q,qgp 2.� 6224 6224 6232 0.8
K 1],3]5 590 5,446 ?Z 626.1 626.1 626.8 0]
L 25,215 53 592 148 645.4 6454 645.4 00
M 20A�J5 190 1,598 55 6573 69.3 6582 0.9
N 30,�55 160 1,117 ].8 6622 6622 662.6 0.4
0 33,665 298 1,538 57 6]0.0 610.0 6709 09
p 36,535 138 1,012 86 6]"!2 6172 677.9 0]
Q 35,015 �83 108] 8.1 6854 685.4 686.3 0.9
R 4t,685 181 i,21] �2 693.5 6935 694.4 0.9
�FEET ABOVE CONF WENCE NATH MISSISSIPPI RNEF
°ELEVATIONS WITHOUT CONSI�ERING EACKWATER EFFECT FROM MISSISSIPPI RNER
� FEOERALEMERGENCTM1IANNGEMENTNGENCY FLOODWAYDATA
m DUBUQUE COUNTY� IA CATFISH CREEK
ANDINCORPORATE�AREAS
49
Table 24: Floodway Data
FLOO�WGSOURCE FLOODWAY �-PERCENT-ANNUAL.CHANCE FLO00
WATER SURFACE ELEVATION
WIDTH SECTIOPI MEAN REGULATORY WRHOUT WITH INCREASE
CROSS SECTION OISTANCE� AREA VELOCITV FLOODWAY FLOO�WAY
(FEET) (SQFEET) (FEETISEC) (FEETNAV�) (FEETNAVD) (FEETNAV�) (FEET)
CLOIE BRANCH
A 630 315 2.462 22 635.4 632b� 6335� ���
B 2,085 182 1223 4.4 635.4 633.1� 634.1� ���
C 4,005 50 403 i3.3 6410 6410 E41.8 0.8
0 5,695 132 833 6.4 650.3 650.3 651.3 1.0
E 0,015 182 660 "!.6 659.8 659.8 659.8 0.0
F 11,505 �03 464 108 6799 6]99 680.9 1.0
G 14,430 451 B0� 62 695] 6'J5.7 G'J5.7 0.0
'FEET ABOVE CONF WENCE WITH LITLE MAQUOKETA RIVER
°ELEVATIONS WITHOUT CONSIOERING BACKWATER EFFECT FROM LITfLE MA�UOKETA RNER
� PE�ERFLEMERGENLYMANAGEMENiAGENCV FLOODWAYDATA
m DUBUQUE COUNTY, IA
qN01NCORPORATEDAREAS CLOIE BRANCH
50
Table 24: Floodway Data
1-PERCENT-ANNUAI-CHANCE FLOOD
FLOOOING SOURCE FLOODWAV yyqTER SURFACE ELEVATION
SECTION MEAN WITHOUT WITH
WIOTH REGULATORV MCREASE
CRO55 SECTION DISTANCE' AREA VELOCITY FLOO�WAY FLOOOWAY
(FEET) (S�FEET) (FEETISEQ) (FEET NAVp) (FEET NAV�) (FEET NAV�) (FEET)
COULER VALLEV
A 830 ]50 1,]40 14 6223 6115� 612.5 ��
B 1 550 240 802 3.1 G22 3 615 9� 615.9 ��
C 3,000 260 2,043 1.0 6223 61I.8' 618.3 0.5
D 3,550 310 1670 12 6223 617.8� 6186 0.8
E 3,880 295 1 62] 1 2 622 3 617.9� 618.7 0.8
F 4.410 260 1,174 1.7 622.3 61HA' 618.9 0.9
G 4820 2]0 1,030 L�J 622.3 6182' 619.1 09
H 5,250 300 1.508 1.3 622.3 6184� 61'JA ��a
I 6,'J00 260 1,413 1.4 6223 619.5� 620.4 ��9
J �,600 260 891 23 6223 619.6' 620.6 ���
K �J,810 160 1 009 1 4 626 4 626.4 627.0 0.6
� ii.ioa no no i.e sz�s szss sz�s i.a
'FEET ABOVE CONFWENCE WIiH LRLE MA�UOKETA RIVER
'ELEVATIONS WITHOUT CONSIDERING EACKWATER EWECT FROM LITfLE MA�VOKETA RIVEF
D FE�ERHLEMERGENCYMPNFGEMENTHGENCY FLOODWAY�ATA
m DUBUQUE COUNTY, IA
ANDINCORPORATEDAREAS COULER VALLEY
51
I I
Table 24: Floodway Data
FLOO�ING SOURCE FLOODWAY 1-PERCENT-ANNUAL.CHANCE FLOO�
WATER SIIRFACE ELEVATION
WIDTH SECTION MEAN REGUL4TORY WITHOUT WITH INCREASE
CROSSSECTION DISTANCE' AREA VELOCITY FLOODWAV FLOOOWAV
(FEET) (Sp.FEEn (FEETISEG) (FEETNAV�) (FEETNAV�) (FEETNAVDJ (FEET)
COULER VALLEV
TRIeUTARY
A 354 166 937 1.3 6354 617.1� 618.1� 10
B 930 29 116 10.6 641.0 6218' 622.6° 10
G 1550 22 97 12] 638.1 638.1 638.9 0.8
'FEET ABOVE CONFLUENCE WITH COULER VALLEY
°ELEVATIDNS WITHOUT CONSI�ERING BALKWATER E WECT FROM LITTLE MqpllpKETH RNER
� FEOEFAI.EMERGENCYMANAGEMENTAGENCY FLOODWAYDATA
m DUBUQUE COUNTY, IA
AND INCORPORATED AREAS COULER VALLEY TRIBUTARY
52
Table 24; Floodway Data
1-PERCENT-ANNUAL-CHANCE FLOOD
FLOODINGSOURCE FLOD�WAV WATERSURFACEELEVFlTION
SEGTION MEAN REGUL4TORV WITHOt1T WITH WCREASE
wioTn
CROSSSECTION DISTANCE' AREA VELOCITY FLOODWAV FLOO�WAY
(FEET) (SQFEET) (FEET/SECJ (FEETNAVD) (FEETNAVD) (FEETNAV�) (FEET)
DURION CREEK
q p 269 1 b26 3.4 896 4 896.4 897 4 1.0
B 1730 1�1 794 6.9 8992 8'J92 9002 10
C 3,]42 153 ]36 7.0 906.1 906.1 90].1 1.0
D 3813 182 970 53 90Z] 90]] 908.7 10
E 4,073 121 982 5.2 9�9.5 'J09.5 910.5 1.0
F 6,200 89 560 74 9133 913.3 9143 1.0
G 9,290 134 739 5.6 919 4 919.4 920 4 1.0
H �09�0 95 366 11.3 �J27.1 'J2].1 927.1 00
�FEET ABOVE OUBU�IIFJOELAWARE COUNTY BOUNDARY
� FEDERFLEMERGENCYMANHGEMENTAGENCY FLOODWAYDATA
m DUBUQUE COUNTY� IA DURION CREEK
p ANDWCORPORATE�AREAS
53
Table 24: Floodway Data
FLDODING SOIIRCE FLOODWAY 1-PERCENT-ANNl1ALCHANGE FL000
WATER SURFACE ELEVATION
WI�TH $ECTION MEAN pEGUTATORV WITHOUT WITH WCREASE
CROSSSECTION DISTANCE' AREA VELOCRY FLOODWAY FLOODWAY
(FEET) (SQFEET) (FEETBEGJ (FEETNAV�) (FLETNAVD) (FEETNAV�) (FEET)
GRANGERCREEK
A 250 267 1 2�2 6 6 611.8 602 4' 603.4� ���
B 2,110 204 1,430 5.6 611.8 60]4� 6084� 1.0
C 4J00 �62 1,380 5.8 612.9 612.9 613.9 1.0
D 4,976 195 �,6t2 4b BtSA 815.4 818.4 10
E 6,860 154 921 7 9 622 3 622 3 623 3 1.0
F 90�0 �4 582 12.5 637.9 637.9 638.'J 1.0
G 71,320 136 628 88 654.1 654.1 655.1 10
H 13,656 142 1.033 7.1 666.1 666.1 66].1 1.0
I 14,865 268 1,925 3.8 673.5 673.5 6745 1.0
J 15.39G 115 l8� 8.1 6�4.1 6]4.1 6�5.1 10
K 16,9�0 �03 526 12.1 680.6 6806 68�6 1.0
L 20,120 187 'J57 6] 6�J3.1 693.1 6�J4.1 10
M 21810 90 5]3 11.1 701.0 701.0 702.0 10
`FEET ABOVE CONFW ENCE WITH CATRSH CREEK
°ELEVqTIONS WITHOUi CONSI�ERING BACKWATER EFFECT FROM CHTFISH LREEK
n FE�ERALEMERGENCTMHNPGEMENTFGENCY FLOODWAYDATA
m DUBUQUE COUNTY, IA
PN�INCORPORATE�AREAS GRANGER CREEK
54
Table 24: Floodway Data
1-PERCENT-ANNUAL-CHANCE FLOO�
FLOODING SDURCE FLOODWAY WqTER SURFACE ELEVPTION
SECTION MEAN WITHOUT WITH
WIDTH REGUL4TORY INCREASE
CROSS SECTION DISTANCE' AREA VELOCITY FLOODWAY FLOO�WAY
(FEETJ (S�.FEET) (FEETSEQ) (FEET NAVD) (FEET NAVD) (FEET NAVD) (FEET)
HEWITT CREEK
A 1,84D 260 2?40 52 945.1 945.1 946.1 1.0
B 2$8] t,000 1,'J10 1.5 9469 946.9 'J4].9 1.0
C 3485 300 2,016 5.1 94]3 94]3 948.1 0.8
� 4.699 215 2.295 44 949.7 94'J.7 950.6 0.9
E �,g�q h35 2.1�J8 46 954.3 'J543 955.1 0.8
F 9,"/]0 104 1,530 6] 9602 'J602 961D ��8
G 12.8]0 5"/1 3,436 3.0 9672 9672 9679 ��
H 14,470 650 3,385 30 9690 969.0 969.8 OB
I 15,570 650 2951 35 9704 9]0.4 9]14 ���
J 16.8�0 550 2.487 4.1 W32 W32 974.1 0.9
'FEET ABOVE CONFLUENCE WITH NORTH FORK MAOUOKET�1 RNER
D pEOERNLEMERGENCYMANNGEMENTpGENCY FLOODWAYDATA
m DUBUQUE COUNTY� IA HEWITTCREEK
N ANDINCORPORATEDAREAS
55
I �
Table 24: Floodway Data
FLOO�ING SOURCE FLOO�WAY 1-PERCENT-ANNUAL-CHANCE FL000
WATER SURFACE ELEVATION
SECTION MEAN WITHOUT WITH
WI�TH REGUL4TORV INCREASE
CROSSSECTION OISTANCE' AREA VELOGRY FLOODWAV FLOODWAY
(FEET) (SQFEET) (FEETISEC_) (FEET NAV�) (FEET NAVD) (FEET NAVD) (FEET)
HEWITT CREEK
TRIBUTARY
A 'J50 9� 525 105 946.9 944.1� 'J45.1' 1.0
B �,�09 110 'JOi 6.1 948.0 'J48,0 948.8 0.6
C 3.326 q05 2,775 2.0 9550 955.0 956.0 1.0
� 7.300 145 604 80 969.6 969.6 'J70.5 ��9
E 'J.100 137 1.482 3� 980.1 980.1 961.1 1 0
'FEETABOVE CONFWENCE WRH HEWITf CREEK
°ELEVATIONS WITHOUT CONSIDERING BACKWHTER EFFEQ FRCM HEW ITT CREEK
� FEDERHLEMERGENLYMFNFGEMENTAGENCY FLOODWAYDATA
m DUBUQUE COUNTY, IA
ANo INcoRPOR.4TED AREAS HEW ITT CREEK TRIBUTARY
56
Table 24: Floodway Data
'I-PERCENT-ANNUAL�CHANCE FLOOD
FLOODING SOURCE FLOO�WAY WATER SURFACE ELEVATION
SECTION MEAN REGULATORY WRHOIIT WITH INCREASE
WIDTH
CROSSSECTION OISTANCE' AREA VELOQTY FLOODWAY FLOOOWAY
(FEET) (SOFEET) (FEETISECJ (FEETNAVD) (FEETNAVD) (FEETNAVD) (FEET)
LITTLE
MAQUOKETA
RNER
A 117 1.036 9,551 42 613 9 613.9 614 7 0.6
9 5,685 1,111 10,841 37 617.5 61Z5 618.5 t0
C 9,243 982 9.658 4.� 618.8 618.8 61�J.8 1.0
D 13,953 7]0 6,814 58 621.1 621.1 6220 0.9
E 15,933 660 6.365 6.3 623.1 623.� 6241 10
F 11,043 204 2,'J02 13] 624.1 624.1 625.1 1.0
G i1459 333 5,265 �6 62G] 626.7 62�.7 10
H 17�63 164 3 144 127 626] 626] 6277 1.0
I 19,003 1,165 16,373 24 629.6 6296 630.6 10
J 20.283 1,388 19,3'J4 2.1 629] 629] 630] 10
K 21683 1325 1]]]0 22 62J.8 629.8 6308 10
L 22,'J83 1,126 1�3]8 2.6 629.'J 6299 630.�J 1.0
M 25,533 944 17250 3.5 630.3 630.3 631.3 1.0
N 2],535 1,394 13,G72 2.�J 6312 6372 6322 10
O 27,652 1369 12,883 3.1 6314 631.4 632.4 1A
P 31.615 614 6.543 6.1 635 4 635 4 636 4 1 0
p 31 830 631 6.853 5 3 636.8 636.8 63].0 1 0
R 34,023 �00 9,907 3] 6392 6392 64Q2 10
5 3]313 668 �432 4.J 642.1 642.1 643.1 1.0
T 39,393 615 6,056 45 645.1 645.1 646.1 1.0
U 41,165 5'J8 6,60] 5.5 G4].4 6474 648.4 1.0
V 41,381 6]i G,567 56 6482 6482 64J2 10
W 42.533 455 4 603 2.0 649 4 64J.4 650.4 1.0
X 44.153 317 2,77] 3.3 649.8 649.8 6508 10
y 46,�13 20� 1,423 6.4 6520 652.0 6530 1.0
'FEET A90VE OL�CHICPGO,MIL WHl1KEE,ST.PAUL,ANO PAQFlC RAILROAD
D FEOERNLEMERGENCVMNNf�GEMENTFGENCY FLOODWAY�ATA
m DUBUQUE COUNTY, IA
AND INCORPORATED AREAS LITTLE MAQUOKETA RIVER
57
Table 24: Floodway Data
FLOOOING SOORCE FLOODWAY �-PERCENT-FNNUAL-CHNNCE FL000
WATER SURFACE ELEVATION
WIOTH SECTION MEAN RE6l1tATORY WITHOUT WITH INCREASE
CROSS SEGTION pISTANCF AREA VELOCITY FLOODWAY FLOODWAV
(FEE� (SQ.FEET) (FEET/SEC.J (FEETNAV�) (FEETNAV�) (FEETNNVD) �FEETJ
LITTLE
MAQUOKETA
RIVER
Z 47.650 90 699 13.1 654.9 654.9 655] 0.8
AA 47,766 111 t072 8.6 692 65I2 6562 1.0
AB 49,]95 300 3,824 24 658.5 6585 659.5 10
FlC 50 011 289 3.510 2 6 658.6 658.6 659 6 1 0
AD 50,806 404 926 9.9 663,1 663,1 664.7 1.0
AE 52,233 232 1,5�8 5.8 669 2 669 2 6�02 1.0
AP 54 453 103 �J15 10.0 675.0 675.0 6]5.6 0.6
AG 56,233 25] 1,594 5.8 679.0 6�9.0 680.0 1.0
AH 59,083 150 1,119 82 684.6 6848 685.8 1.0
AI 61,338 242 1,�04 5.4 686.'J 6889 689.9 1.0
AJ 63,JG3 166 1070 8.6 694.1 694.1 6�J5.1 1.0
AK 65,148 130 1,032 8.9 6�J]8 69]8 698.8 1.0
�FEET ABOVE CHICAGO,MILWAUKEE ST.WW L,AND PALIFIC RAILROAO
� FEOERNLEMERGENCYMNNHGEMENTPGENLY FLOODWAYDATA
m DUBUQUE COUNTY, IA
arvolNCORPORATEDAREAs LITTLE MAQUOKETA RIVER
58
Table 24: Floodway Data
1-PERCENT-FNNUALCHANCE FLOOD
FLOODING SOl/RCE FLOODWAY yyqTERSURFACE ELEVATION
SEGTION MEAN WITHOUT WITH
WI�TH REGUL4TORV INCREASE
CROSSSECTION pISTANCE' AREN VELOCITY FLOO�WFlY F�OO�WAY
(FEET) (SQFEET) (FEETISEG) (FEETNAV�) (FEETNAVD) (FEETNHVD) (FEET)
MIDOLE FORK
CATFlSHCREEK
A 1,020 365 2,844 2.4 620.3 620.3 6213 1.0
B S,t30 100 10,007 6.8 638] 638] 638.9 Q2
C 12.19� �40 223] 30 669.3 6693 670.1 0.8
D 16.5�0 360 �J22 7.4 GA6.4 686.4 68].1 0]
E 25,300 100 680 �.8 �24.0 �24.0 724.9 09
F 34,]10 120 L296 3.8 7613 7613 761.9 0.6
G 40,�80 250 L248 3.8 781.9 7II1.�J 782.4 0.5
H 41,48� 317 602 ].9 ]85.3 �85.3 �860 0]
I 43,2]0 145 465 103 �922 7922 7'J2? 0.0
'FEET ABOVE CONF WENCE IMTH CAiFlSH CREEK
D FEOERHLEMERGENLYMr1NAGEMENiPGENCY FLOODWAYDATA
m DUBUQUE COUNTY, IA
AN�INCORPORATEOAREAS MIDDLE FORK CATFISH CREEK
59
I
Table 24: Floodway Data
FLOODING SOURCE FLOODWAY BASE FLOOD
WATER SURFACE ELEVATION FEET
SECTION MEAN W�THOUT WITH
CROSSSECTION DISTANCE' WIDTH AREA VELOqTV REG�LPTORY FLOODWAY FLOODWAY �IFFERENCE
(FEET) (SQUARE (FEET PER (NAVO) (NAV�) (NAVD)
FEET SECON�
MISSISSIPPI RIVER
A 568.40 6,00611,385� 111.027 2.5 6062 6062 6�6.5 0.3
B 570.60 5 912I365' 107,788 25 607.0 607 0 607 3 0 3
C 57230 6,783/4,845� �25,302 22 607.6 6076 607.9 03
D 57470 5,437I1,500' 96,121 28 6083 6083 608.5 02
E 576.60 509V590� 83,374 3.3 6092 6092 609.4 03
F 578,60 3,9�41823° 79,269 35 6100 610.0 6103 02
G 580.5� 1,969/1045� 75,582 36 6Wb 610.6 610.9 02
H 582.60 2,692/380� 75,2N 3.6 611.1 611.1 611.5 0.3
I 58500 7,54V4,975� 140,521 2.0 61�9 611.9 612.5 OS
J 587.50 8,25611720� 165,353 iJ 6�22 6122 612.6 0.4
K 588.50 9,636/2 625� 17Q962 1 6 612.3 612.3 812 8 0.5
L 590.60 7,032/1,260� 123,280 22 612] 6727 613.1 0.4
M 592.50 g,g7�/gW� 138,022 20 6132 6132 673.5 0.4
N 594.40 7,523/8]5� 116,165 2.4 613.6 613.6 613.9 0.3
O 59620 7,126I605� 110,834 2.5 6�42 6142 614.5 0.4
P 598.00 6,558I705' 102044 2] 6147 614.7 615.0 0.3
Q 599.90 6,954I675` 113,592 2.4 615.4 675.4 6157 0.3
�Miles above conflunce with Ohio River
�Total WitlihNVitlth Within County Bountlary
n FEDERAL EMERGENCY MANAGEMENTAGENCY FLOODWAY DATA
m DUBUQUE COUNTY, IA
p AND INCORPORATED AREAS MISSISSIPPI RIVER
so
Table 24: Floodway Data
1-PERCENT-ANNUAL-CHANCE FLOOD
FLOODING SOURCE FLOODWAY WqTER SURFACE ELEVATION
WI�TH SECTION MEAN REGl1LATORY N'ITFIOt1T WITH INCREASE
CROSS SECTION DISTANCE' AREA VELOCITV FLOODWAY FLOO�WAV
(FEET) (SQFEET) (FEETISEQ) (PEETNAVD) (FEETNAVO) (FEETNAVD) (FEET)
NORTHFORK
CATFISH CREEK
A 4.040 150 593 6.1 719.1 7�9.� 719.3 02
B 5,050 "I50 509 63 �292 �Z9,z �29,`' 0.3
G 8,]50 �50 f313 26 �60.7 ]60] �610 0,3
�FEET NBOVE LONFW ENCE IMTH MI��LE FORK CpTFISH CREEK
� FEDERNLEMERGENLVMANAGEMENTAGENCY FLOODWAYDATA
m DUBUQUE COUNTY, IA
AND INCORPORFlTEO AREAS NORTH FORK CATFISH CREEK
61
Table 24: Floodway Data
FLOODING SOURCE FLOO�WAY 1-PERCENT-ANNLIAL-CHANCE FLOOD
WATER SURFACE ELEVATION
SECTION M[HN WITHOUT WITH
WIDTH REGl1LATORV INCREASE
CROSSSECTION DISTANCE� AREA VELOCIiY FLOO�WAV FLOOOWAV
(FEET) (SQ.FEET) (FEET/SEC.) (FEETNAVD) (FEETNAVD) (FEETNAV�) (FEET)
NORTHFORK
LITTLE MAQUOKETA
RIVER
A 538 494 3872 72 6485 645.3� 646.3� 1.0
B 2.469 470 4081 6B 648.5 fi48.1� 649.1� 1.D
C 5,527 503 4560 fi.i 652.7 6527 6537 1.0
� 7444 616 5144 54 655.1 655.1 656.t 1.0
E t0,404 457 4086 6.8 658.9 6569 659.9 10
F 12,124 456 2336 3.3 660.8 660.8 661.8 1.0
�FEET ABOVE W NF W ENCE WITH LITTLE MApUOKETA RNER
'ELEVATIONS W RHOUT CONSIDER WG BACKWATER EFFECT FROM LITTLE MApUOKETA RNER
� FEOERqLEMERGENCYMFNAGEMEMAGENGY FLOODWAYDATA
m DUBUQUE COUNTY, IA
AN�INCORPORATED AREAS NORTH FORK LITTLE MAQUOKETA RIVER
62
Table 24: Floodway Data
FLOOOING SOURCE FLOO�WAY 7-PEftCENT-ANNUAL-CHNNCE FLOOD
w4_TE,R,SI�Rpqf:E FI_FVqTIpN
WIDTH SECTION MEAN REGULATORV WITHOUT WITH INCREASE
CROSSSECTION DISTANCE� AREA VELOCIiY FLOODWAV FLOO�WAY
(FEET) (SOFEET) (FEET/SEG) (FEETNAVD) (FEETNAV�) (FEETNAVD) (FEET)
NORTHFORK
LITTLE MA�l10KETA
RNER TRIBUTARV
A 166 52 535 90 652] 6504� 651A� ��
B 1,968 61 401 12.0 658.0 658.0 659A ���
C 4,228 157 559 8.6 672.8 672.8 6738 ���
� 6,066 67 59G 8.1 688.5 686.5 689.5 ���
E 7,386 57 345 13 9 696.3 696.3 696.9 0.6
P 7 510 108 708 6.8 699.3 699.3 7003 ��0
G 9,430 47 308 14.5 720.3 7203 720.3 0.0
H 9,606 360 3,169 14 729.3 729.3 730.3 �-�
I 10,888 286 1815 25 729.6 729.6 730.6 ���
1 FEET NBOVE CONF W ENCE WITH NORTH FORK LITiLE MAQUOKETA RIVER
°ELEVATIONS WITHOOT WNSI�ERING BACKWATER EFFECT FROM NORiH FORK LITfLE MHQUOKETA RNEF
D FE�EliALEMERGENGYMFNAGEMENTAGENCY FLOODWAYDATA
m DUBUQUE COUNTY, IA
^� AN�INCORPORATE�AREAS NORTH FORK LITTLE MAQUOKETA RIVER TRIBUTARY
63
I I
Table 24: Floodway Data
FLOODING SOURCE FLOODWAY 1-PERCENT-ANNUAL-CHANCE FLOOD
WATER Sl1RFACE ELEVATION
SECTION MEAN WITHOUT WITH
WIDTH REGULATORV WCREASE
CROSSSECTION DISTANCE� AREA VELOCITY ROO�WAY FLOODWAV
(FEET) (SQ.FEET) (FEETISEC.) (FEETNAVD) (FEETNAVD) (FEETNAVD) (FEET!
NORTHFORK
MAQUOKETARNER
A 0.00 ppg��pp� 3,657 52 810.3 8�0.3 811.3 1.0
B 3.00 409/210� 5,913 32 811.4 811.4 812.4 1.0
C 7.80 �,300 13,436 1.4 812.5 8125 813.4 0.9
D 9.25 152 2,197 8] 812.8 812.8 813.8 t 0
E 9.80 176 t,405 13.6 8�6.6 8�6.6 8�6.6 0.0
F 10.50 650 4,759 4.0 820.1 820.1 8202 0.1
G 1270 845 7,03t 2.7 821.4 82t.4 822.4 1.0
H 16.00 973 6,127 30 822.7 822.7 823.6 0.9
I 20.00 367 2,146 8.6 825.8 825.8 826.5 07
J 21.95 180 2,300 8.0 ffi9.9 829.9 830.4 0.5
K 25.00 172 2,084 8.8 832.4 832.4 833.4 t.0
L 136.�6 367 4,336 37 926.3 926.3 9272 0.9
�I 137.30 281 3.721 43 927.5 927.5 9282 07
N 139.90 332 4,443 3.6 929.8 929.8 930.5 0.7
O 14�.78 282 3,428 4.6 931.6 93�.6 9323 0.7
P 142.75 350 4,965 32 932.5 9325 9332 0.7
Q 144.45 670 7,657 2.7 933.8 933.8 934.5 07
R 145.6� 754 6,060 2.6 934.4 934.A 935.� 0.7
S 147.�5 480/37�' 6.�42 2.6 9362 9362 936.9 �]
T 14&25 1,175 �2,333 t3 9366 936.6 937.5 p,g
U 149.35 �,395 13,640 12 936.8 936.8 937.7 0.9
V 15070 880 7,785 1.6 937.0 937.0 937.9 0.9
W 15�.68 250 2,639 4.8 9372 93Z2 938.1 O.�J
X 152.55 220 2,096 6.0 938.8 938.8 939.4 �.6
V 15378 460 4,125 3.1 940.4 940.4 9412 0.8
Z 155.78 400 3.178 4.0 9n2.5 9A2.5 943.3 0.8
'THOUSAN�SOFFEETABOVEDIIBUQUFJJONE5CO0NTV80UNDARY
'WIDTHMIIDTH WITHIN�UBU�UE COUNTY
-1 FE�ERALEMERGENCYMFNAGEMENTPGENCY
m FLOODWAY�ATA
m DUBUQUE COUNTY, IA
AND INCORPORA7Eo AREAS NORTH FORK MAQUOKETA RIVER
64
Table 24: Floodway Data
'I-PERCENT�ANNUAL-CHANCE FLOOD
FLOODING SOURCE FLOODWAY Wp7ER SURFACE ELEVATION
SECTION MEAN REGULATORY WITHOUT WITN MCREASE
WIDTH
CROSSSECTION DISTANCE� AREA VELOCRV F�OODWAY FLOO�WAV
(FEET) (SQFEE� (FEETISECJ (FEETNAVO) (FEETNAVD) (FEETNAVD) (FEET)
NORTHFORK
MAQUOKETA RIVER
qp, 157.04 600 4,917 �.G 943.8 943.8 944.5 07
AB 158.30 975 6,133 2.1 944.7 944.7 945.4 0.7
AC 159.80 400 1,936 4] 945.6 945.6 'J+6.3 0]
AD 1fi103 815 3,9P 2.3 947.2 9472 947.8 0.6
AE 162.90 1,W9 6,050 L5 947.9 947.9 948.6 0.7
AF 164.15 375 2.972 3.t 948] 948] 949.5 0.8
AG 16705 800 3,193 2.9 953.0 953.0 953.6 0.6
AH 167.75 800 3,515 2.fi 955.8 955.8 956.0 02
AI ifi8.90 969 4,253 22 956A 95fi.4 956.9 0.5
AJ 170.30 331 1,890 +.9 956.fi 956.6 9573 0]
AK 17270 481 2?03 42 960.4 960A 960.5 0.1
AL 174.15 119 �,429 64 963.t 963.1 963.1 0.0
AM 175.43 159 1,442 6.4 966.5 96fi.5 966.7 ��2
AN 17770 300 2,639 3.5 9723 972.3 9728 0.5
AO 179.17 290 1,848 5.0 975.8 975.8 9762 0.4
AP 180.85 194 1.650 5.'I 9788 978.6 9793 0.7
AQ 184.00 440 2,984 2.8 980.8 980.8 981.4 0.6
AR 186.40 306/280' 2,090 4.0 982.0 982.0 982.6 0.6
AS 186.65 477 2,720 3.1 984.6 984.fi 984.9 0.3
AT 189.00 249 t.933 4.3 986.8 986.8 9872 ��4
AU 190.83 325 2,393 3.� 987.8 987.8 988.3 0.5
AV 19285 154 1,007 Z2 988.7 9887 989.3 0.6
qW 19358 348 Z,Z3fi 33 990.4 990.4 990.9 0.5
AX 194.12 250 1,03'I l.t 990.5 990.5 991.t 0.6
AY 195.84 210 1,985 3] 998.3 998.3 998.4 0.�
AZ 198.40 3�2 2,193 3.3 999.7 9997 1,000.0 0.3
�THOUSAN�SOFFEETABOVEDUBU�UFJJONESCOUNTYBOl1N�AftY
'WI�THNJIOTH WITHIN�UBUpt1E COl1NTY
� FE�ERALEMERGENCYMFNAGEMENTNGENCV FLOODWAYDATA
m DUBUQUE COUNTY� IA NORTH FORK MAQUOKETA RIVER
ANOINCORPORATEDAREAS
65
Table 24: Floodway Data
FLOODING SOIJRCE FLOODWAY 'I-PERCENT-ANNUAL-CHANCE FLOOD
WATER SURFACE ELEVATION
WIDTH SECTION MEAN REGULATORV W�THOUT WITH WCREASE
CROSSSECTION pISTANCE' AREA VELOCITY ROOOWAY FLOODWAY
(FEET) (SOFEET) (FEETISEC) (FEETNAVD) (FEETNAVD) (FEETNAVD) (FEET)
NORTHFORK
MAQUOKETARNER
BA 200.67 710 3,203 2.3 1,000.6 t,000.6 �,OOt.O O.A
BB 20320 220 1,194 6,1 1,004.3 1,0043 1,004.6 0.3
BC 207.60 328 1.843 3.9 t,010.8 1,010.8 1,011.5 07
'THOUSANOS OF FEET ABOVE Dl1BUQUEIJONES COUNTV BOUN�ARY
D fE�EMLEMERGENCYMANNGEMENTAGENGY FLOODWAYDATA
m DUBUQUE COUNTY� IA NORTH FORK MAQUOKETA RIVER
N ANDINCORPORATEDAREAS
66
Table 24: Floodway Data
1-PERCENT-ANNUALCHANCE FLO00
FLOODING SOURCE FLOODWAV WpTER SURFACE EIEVATION
WI�TH SECTION MEAN REGULATORV WITHOUT WITH INCREASE
CROSSSECTION pISTANCE' AREA VELOCITY FLOODWAV FLOOOWAV
(FEET) (SQFEET) (FEETISE0.) (FEETNAVD) (FEETNAVD) (FEETNAV�) (FEET)
NORTHFORK
MAQUOKETA RIVER
TRIBUTARV
A 1,510 189 506 52 �J36.3 932.3� 9323� 0.0
B 1,800 160 563 4.6 936.3 933.8' 933.8� 00
G 2,120 258 1,155 2.3 938.9 938.9 9389 0.0
0 2,515 144 680 3.8 9369 936.9 938.9 0.0
E 2,980 157 536 4.9 9402 9402 9402 0.0
F 6,540 780 324 8.1 964.6 9646 9648 02
G 7 000 'I53 402 6.5 967 3 967 3 968.1 0.8
H 8,62a 150 528 4.9 9752 9752 975] 0.5
I 9,350 146 311 8 4 979 4 979 4 979.4 0.0
�fEET FlBOVE COUNF W ENCE WITH NORTH FORK MAQUOKETA RNEft
'ELEVATION COMPUTED WITHOUT CONSI�ERATION OF BACKWATER EFFECTS FROM NORTH FORK MA�UOKETA RNER
� FE�ER/LEMERGENCYMNNAGEMENTAGENCY FLOODWAYDATA
m DUBUQUE COUNTY, IA
�' AN�INCORPORATE�AREAS NORTHFORKMA�UOKETARIVERTRIBUTARY
67
I �
Table 24: Floodway Data
FLOODING SOURCE FLOODWAY 1�PERGENT�ANNUAL�CHANCE FLOOD
WATER SURFACE ELEVATION
WIDTH SECTION MEAN REGULATORY W��HOUT WITH WCREASE
CROSSSECTION DISTANCE� AREA VELOCITY R.00�WAV FLOODWAV
(FEET) (SQFEETJ (FEETISECJ (FEETNAVD) (FEETNAVD) (FEETNAVD) (FEET)
SHERRILLCREEK
A 2,600 171 817 5.1 648.6 6472� 6482� 10
8 4 480 140 910 4.6 652.3 652.3 653.3 �0
'FEET ABOVE CONRIIENCE WITH LITTLE MAQUOKETA RNER
'ELEVATION WITHOUT GONSIDERING BACKWATER EFFECT FROM LRTLE MA�UOKETA RNER
ti FEOERALEMERGENCYMFNFGEMENTAGENCV
� FLOODWAY DATA
m ��B�Q�E Ci��NTY� �Q
ANDINCORPORATEOAREAS SHERRILL CREEK
68
I
Table 24: Floodway Data
FLOODING SOURCE FLOODWAV �-PERCENT-ANNUAI-CHANCE PLOOD
WATER SURFACE ELEVATION
SECTION MEAN WITHOUT WRH
WIDTH REGULATORV INCREASE
CROSSSECTION pISTANCE� AREA VELOQTV FLOO�WAY FLOO�WAV
(FEET) (SpFEET) (FEETISEC.) (FEETNAVD) (FEETNAVO) (FEETNAV�) (FEET)
SOUTHFORK
CATFISH CREEK
A 1,065 210 2,216 3,5 626.5 626.5 627.1 06
B 4,545 220 1879 42 640.5 640.5 fi41.0 0.5
C 6,145 250 600 13.0 645.9 645.9 645.9 0.0
D 8,505 150 757 �03 655.1 655.1 655.9 08
E 15 745 160 616 i t5 W 6.9 676.9 677.5 0.6
F 19,585 185 761 9.3 6929 692.9 6935 06
G 22.785 120 722 9 8 704.3 7043 704.9 0.6
�H 24,005 200 1,124 6.3 713.9 713.9 713.9 00
I 24,795 150 616 115 714.7 714.7 714 7 0 0
J 27,335 2�0 833 8.5 725.5 725.5 725.8 0.3
K 29,395 180 708 10.0 7327 732.7 733.3 0.6
L 33 975 250 1,041 6.8 744 8 744.8 745.6 Q�8
M 35,975 200 662 10.7 7qg,5 749.5 7502 4��
N 38,645 26� 907 6.7 760.6 760.6 760] ���
O 39,470 300 981 62 766.5 7665 . �66.9 ��4
P 40,180 150 627 9.7 7670 767.0 767.7 ���
�FEET ABOVE CONFLUENCE WITH CAiFISH CREEK
n FEOERALEMERGENCYMANAGEMENTNGENCY FLOODWAYDATA
m DUBUQUE COUNTY, IA
� AND INCORPORATEo AREAS SOUTH FORK CATFISH CREEK
6�J
Table 24: Floodway Data
FLOOOING SOURCE FLOO�WAV 1-PERCENT-ANNUAL�CHANCE FLO00
WATER SURFAGE ELEVATION
SECTION MEAN WITHOUT WITH
WIDTH REGULATORV INCREASE
CROSSSECTION p15TANCE' AREA VELOCIiV FLOODWAV FLOODWAV
(FEET) (SQ.FEET) (FEETISEC.) (FEETNAVD) (FEETNAVD) (FEETNAVD) (FEET)
UNION PARK
HOLLOW
A 4,740 27 98 132 665.8 6658 6662 0.4
8 8,360 30 117 10.0 725.0 725.0 726.0 10
C 10 400 43 155 62 758 H 756.8 759.8 1.0
�FEET ABOVE CONFLUENCE WITH COULER VALLEV
D FEDERAIEMERGENCYMFNAGEMENTAGENCY FLOODWAYDATA
m DUBUQUE COUNTY, IA
p ANDINCORPORATE�AREAS UNIONPARKHOLLOW
70
Table 25: Flood Hazard and Non-Encroachment Data for Selected Streams
[Not Applicable to this Flood Risk Project]
6.4 Coastal Flood Hazard Mapping
This section is not applicable lo this Flood Risk Project.
Table 26: Summary of Coastal Transect Mapping Considerations
[Not Applicable ro this FIS Project�
6.5 FIRM Revisions
This FIS Report and ihe FIRM are b2sed on the most up-to-date infonnarion available to FEMA
at the time of its ptiiblicatiou;however,flood liazard conditions chinge over ti�ne. Comtnunities or
piivate parties may request flood map revisions at any time. Certain types of requests require
submission of supportiug data. FEMA may also initiate a revision. Revisio�ts Lo FIS projects may
take several fomts, including Lelters of Ma� Atnendment (LOMAs), Letteis of Map Revision
Based on Pill (LOMR-Fs), Letters of Map Revision (LOMRs) (referred to collectively as Letteis
of Map Change (LOMCs)), Physical Map Revisions (PMRs), and FEMA-contracted res[udies.
These types of revisions are further <IesciiUed below. Some of these types oF revisions do not
resnit in die republishing of the FIS Report 'I'o assure that any user is awace of all revisions, it is
advisable to eontact the commm�ity repository of flood-hazard data (shown in "1'aUle 31,"Map
Reposilories").
6.5.1 Letters of Map Amendment
A LOMA is an officia] revision by letter to an efFective NFIP map. A LOMA results from an
administrative process Uiat involves tl�e review of scientific or teclmical data subuiitted by Lhe
owoer or lessee o1 property who believes Hte property has iucoirectly been iucluded in a
dcsignated SFHA. A LOMA amends the currently effective PCMA map and establishes d�at a
specific proper[y is not IocaCed in a SPHA.
To obtain au application for a LOMA, visit www feina cov/t7oodplain-inanaeement/letter-map-
amendment-loma and download the form "MT-1 Application Fonns and Lts[ructions For
Conditional and Final Letters of Map Amenclment and Letters of Map Revision Based on Fill".
Visit the `Plood Map-Related Fees" secfion to dete�7uine the cost, if any, of applying for a
LOMA.
FEMA offers a tutorial o�i how to apply for a LOMA. The LOMA Tutorial Series can be acccssed
at www fema.eov/online-tutoiials.
For more inlomi�tion about how to a�ply for a LOMA, call the FEMA Map In£orn�ation
eXcliange; toll free, at 1-877-FEMA MAP (1-877-336-2627).
6.5.2 Letters of Map Revision Based on Fill
A LOMR-F is ao officia] revision by letPer to an effective NPIP map. A LOMR-P' states FEMA's
deterniina[iou concerning wl�etl�er a strucmre or parcel has been clevated on Fill above the base
flood elevation and is, therefore,excluded from tl�e SFHA.
71
Infonnation about obtaioing an application for a LOD4R-P can be obtainec� in the same manner as
tl�at for a LOMA, by visiting�v�vw.fema.Qov/Eloodpiain-mana¢emettt/lettei7nap-amendroent-loma
for the `MT-] Application Fomis and Insavctions for Conditional and Final Letters of Map
Amendment and Letters of Map Revision Based on Fill" or by calling tl�e FEMA Map
Information eXchange, toll free, at 1-877-FEMA MAP (1-877-336-2627). Fees for applying for a
LOMR-P, if any, are listed in the"Flood M�p-Related Fees" section.
A httorial for LOMR-F is available at www.fema.eov/online-tutorials.
6.5.3 Letters of Map Revision
A LOMR is an offlcial revision to the cun�ently effective FEMA inap. IC is used to change flood
zones, floodplain aiid floodway delineations, flood elevatimis and planimehic features. All
requests for LOMRs sl�ould be m�ide to FEMA through the chief executive officer of die
commwiity, since it is the conun�mity ll�at must adopt a�ry changes and revisions to Che map. If
fhe request for a LOMR is not submittecl tluougl� tUe chief executive officer of the coimmuiity,
evidence must be suUmitted that llte community has beeii notified of the request.
To obtain an application for a LOMR, visit ww�v.fema.eov/floodplain-��ianaeemendletter-mao-
amendment-]oma aud download the form "MT-2 Application Fomis a�id Instiuctions for
Conditional Letters of Map Revision ai�d Letters of Map Revision". Visit the `'Flood M�p-Related
Fees" section to determine the cost of applying for a LOMR. For more information about how to
apply for a LOMR, call tl�e FEMA Map Informatiou eXehange; toll free, at ]-877-FEMA MAP
(1-877-336-?627) to speak to a Map Specialist.
Previously issued �nappaUle LOMCs (inchiding LOMRs) ttiat have Ueen incorporated into tl�e
Dubuque Coimry FIRM are listed in Table 27.
Table 27: Incorporated Letters of Map Change
Case Effective
Number Date Flooding Source FIRM Panel(s)
19061CO238F
12-07-2232P 05/31/2013 North Fork Catfish 19061C0351F
Creek
19061C0352F
6.5.4 Physical Map Revisions
PMRs are an official republication of a community's NFIP niap to effect changes to base flood
elevations, floodplaiv boundary delineations, regulatory floodways and planimehic features.
These chauges typically oceur as � result of structura] works or inlprovemeuts, annexations
resultii�g in additioual flood hazard areas or conecfion to base flood elevations or SFHAs.
1'he community's chief executive officer must submit scieutific and technical data to FGMA to
su�port the request for a PMR. The data wil] Ue analyzed and the inap will Ue revised i£
wananted. The community is provided with copies of t(te revised infonuation attd is afforded a
review period. When the Uase flood elevations are cl�anged, a 90-day appeal period is provided. A
6-month adoption period'For fonnal approva] of die revisad map(s)is also provided.
For more infonnation aUout the PMR process, please visit http://www.Fema.gov and visit tl�e
"Flood Map Revision Processes" sectiou.
7?
I
i
6.5.5 Contracted Restudies
Tl�e NFIP provides for a periodic review and restudy of flood hazards within a given commnniry.
FEMA accomplislies this tl�rougll a national watershed-based ma�ping needs assessment strategy,
known as tlie Coordivatecl Needs Manageme�it Strategy (CNMS). The CNMS is used by FEMA
to assign priorities and allocaCe fwiding for uew flood hazard analyses used to update the FIS
Report and FIItM. The goal of CNMS is to define the validiry of the enginceiing study data
within a mapped inventory. The CNMS is used to track the assessment process, docnment
engioeering gaps and their resoliition, and aid in prioritization for using flood risk as a key factor
for areas identified for flood map updates. Visit www.fema.gov to learn more aUout the CNMS or
contact the FEMA Regional Office lisfed in Section 8 of Chis PIS Report.
6.5.6 Community Map History
The current FIRM presents flooding infonnatiou for khe entire geogapliic area of Dubuque
County. Previously, separate FIRMs, Flood Hazard Boundary Maps (FHBMs) and/or Flood
Boundary avd Floodway Maps (FBFMs) may have been prepared for the incorporated
cominunities and the uniucorporated areas in the counry that ]�ad identified SFHAs. Current and
l�istoiical data relating to tl�e maps prepared for the project area are presented in Table 28,
"Communiry Map History." A description of each of the colmrui headings aud the source of the
date is also listed Uelow.
• Con�ma�nity Narne includes commimities falling within the geographic area shown on ihe
FIRM, including Hiose that fall on the boundary]uie, nonparticipating commimities, and
commutiities with maps lhat havc been rescinded. Commtmities with No Special Flood
Hazards are ii�dicated Uy a foomote. If all mal�s (FHBM, FBFM, aud FIRM) were
rescinded for a conmtuniry,it is not listed in this fable unless SFHAs have been identified
in this community.
• Initial Identificatiwz Dake (First NF1P Nlap Published) is the date of the fi�st NFIP map
that identified flood hazards in tl�e winnluuiry. If tlie FHBM has been converted to a
FIRM, the initial FHBM date is shown. If Che comntunity has never been �napped, die
upcoining effective date or `pending" (for Preliminary FIS Repor[s) is sl�own. If the
coilvnuniry is lisfed in Table 28Uut' not identified on the tnap, the community is h'eated as
if it were unmapped.
• Initinl FHBM Ef/ectii�e Dafe is the effective date of the ftst F1ood Hazard Bou�dary Map
(FHBM). This date maybe tlie same date as the li�itial NFIP Map Date.
• FHBMRevision Date(s)is the date(s) that 8�e FHBM�vas revised,ii'applicable.
• Initial FIRM Effective Dnte is the date of tlie 6rsf effective FIRM for H1e convnunity.
This is the first effecYive date that is shown oii the FIRM panel. �
• FIRNI Rerisaon Dnte(s)is the date(s) the PIRM was revised, if applicable. This is the
revised date that is sho�vn on the FIRM panel, if a�plicable. As countywide studies are
completed or revised, each community listed should h�ive its PIIZM dates updated
accordingly t�o reflect the date of the cowitywida study. Once the PIRMs exist iu
countywide format, as Pl�ysicTl Map Revisions (PMR) of FIRM panels witl�in the comity
are completed, tUe FIRM Revisiou Dates in the table for eaclt conlmimiry affected by the
PMR zre updatecl witli the date of tha PMR, even if the PMR did not revise all the panels
within tliat community.
73
The initia] effective date for the DuUuque County FIRMs in countywide fonna[ was October 18,
2011.
Table 28: Community Map History
Initial
Identification
Date(First Initial FHBM FHBM Initial FIRM FIRM
NFIP Map Effective Revision Effective Revision
Community Name Published) Date Date(s) Date Date(s)
City of Asbury2 10/18/2011 N/A N/A 10/18/2011 N/A
City of Balltown'z 10/18/2011 N/A N/A 1 011 8/20 1 1 N/A
City of Bankston�•2 10/18/2011 NIA N/A 10/18/2011 N/A
City of Bernard�•2 10/18/2011 N/A N/A 10/18/2011 N/A
City of Cascade 12/17/1973 12/1711973 11/19/1976 4�2�1979 10/18/2011
1/9/1976 10/16/1992
City of Centralia'? 10/18/2011 N/A N/A 10/18/2011 N/A
8/19/2013
City of Dubuque 5/15/1970 5/15/1970 N/A 5/15/1970 9�6/1989
10/31/1975
7/1/1974
Dubuque County 8/19/2013
(Unincorporated Areas) 6/17/1977 6/17/1977 N/A 9/1/1983 10/18/2011
6/2/1995
City of Durango 10/17/1978 10/17/1978 N/A 7/16/1981 10/18/2011
10/18/2011
City of Dyersville 6/28/1974 6/2811974 5/14/1976 12/1/1977 6/2/1995
11/19/1980
City of Epworth2 10/18/2011 N/A N/A 10/18/2011 N/A
City of Farley'2 10/18/2011 N/A N/A 10/18/2011 N/A
City of Grafz 10/18/2011 N/A N/A 10/18/2011 N/A
City of Holy Cross�•2 10/18/2011 N/A N/A 10/18/2011 N/A
City of Luxemburg2 10/18/2011 N/A N/A 10/18/2011 N/A
City of New Vienna 8/16/1974 8/16/1974 1/23/1976 10/18/1983 10/18/2011
5/16/1994
City of Peostaz 10/18/2011 N/A N/A 10/18/2011 N/A
City of Rickardsville2 10/18/2011 N/A N/A 10/18/2011 N/A
City of Sageville 11/1/1974 11/1/1974 3/5/1976 6/15/1984 10/18/2011
City of Sherrill' z 10/18/2011 N/A N/A 10/18/2011 N/A
City of Worthingtan 11/1/1974 11/1/1974 N/A 10/18/1983 10/18/2011
CityofZwingle 11/5/1976 11/5/1976 N/A 10/18/2011 10/18/2011
'No Special Flood Hazard Areas Identified
ZThis community did not have a FIRM prior to the first countywide FIRM for Dubuque County
�a
i
SECTION 7.0 — CONTRACTED STUDIES AND COMMUNITY COORDINATION
7.1 Contracted Studies
TaUle 29 provides a summaiy oF tl�e contracted studies, by flooding source, that are included in
diis FIS Report.
Table 29: Summary of Contracted Studies Included in this FIS Report
W ork
FIS Report Completed
Flooding Source Dated Contractor Number Date Affected Communities
Bear Creek 10/18/2011 USACE Rock EMW-91-E- �uly 1992 City of Dyersville
Island District 3529
USACE Rock EMW-91-E- City of Sageville,
Bloody Run Creek 10/18/2011 Island District 3529 July 1992 Dubuque County
(Unincorporated Areas)
USACE Rock EMW-91-E- City of Dubuque,
Catfish Creek 10/18/2011 Isiand District 3529 �uly 1992 Dubuque County
(Unincorporated Areas)
Cloie Branch 10/18/2011 USACE Rock EMW-91-E- �uly 1992 Dubuque County
Island District 3529 (Unincorporated Areas)
Couler Valley Creek 10/18/2011 USACE Rock EMW-91-E- �uly 1992 Dubuque County
Island District 3529 (Unincorporated Areas)
Couler Valley Creek USACE Rock EMW-91-E- City of Sageville,
Tributary 10/18/2011 Island District 3529 �uly 1992 Dubuque County
(Unincorporated Areas)
USACE Rock EMW-91-E- City of Worthington,
Durion Creek 10/18/2011 Island District 3529 �uly 1992 Dubuque County
(Unincorporated Areas)
USACE Rock EMW-91-E- City of Dubuque,
Granger Creek 10/18/2011 Island District 3529 �uly 1992 Dubuque County
(Unincorporated Areas)
USACE Rock EMW-91-E- City of Dyersville,
Hewitt Creek 10/18/2011 Island District 3529 July 1992 Dubuque County
(Unincorporated Areas)
USACE Rock EMW-91-E- City of Dyersville,
Hewitt Creek Tributary 10/18/2011 Island District 3529 �uly 1992 Dubuque County
(Unincorporated Areas)
USACE Rock EMW-91-E- City of Sageville,
Little Maquoketa River 10/18/2011 Island District 3529 �uly 1992 Dubuque County
(Unincorporated Areas)
Middle Fork Catfish 10/18/2011 USACE Rock EMW-91-E- �uly 1992 City of Dubuque
Creek Island District 3529
75
�
Table 29: Summary of Contracted Studies �ncluded in this FIS Report(continued)
Work
FIS Report Completed
Flooding Source Dated Contractor Number Date Affected Communities
USACE Rock
Island, St. City of Du6uque,
Louis, Kansas EMW-2002-
Mississippi River 10/18/2011 City, Omaha, IA-0114 2004 Dubuque County
St. Paul (Unincorporated Areas)
Districts
Mississippi River HSFEHQ-09- City of Dubuque,
(Interior Drainage) 8�19/2013 STARR D-0370 March 2012 Dubuque County
(Unincorporated Areas)
North Fork Catfish 10/18/2011 USACE Rock EMW-91-E- �uly 1992 City of Dubuque
Creek Island District 3529
City of Cascade,
North Fork Maquoketa 10/18I2011 USACE Rock EMW-91-E- July 1992 Dubuque County
River Island District 3529
(Unincorporated Areas)
City of Cascade,
North Fork Maquoketa 10/18/2011 USACE Rock EMW-91-E- July 1992 Dubuque County
River Tributary Island District 3529
(Unincorporated Areas)
USACE Rock EMW-91-E- City of Durango,
Sherrill Creek 10/18/2011 Island District 3529 �uly 1992 Dubuque County
(Unincorporated Areas)
South Fork Catfish USACE Rock EMW-91-E- City of Dubuque,
Creek 10/18/2011 Island District 3529 July 1992 Dubuque County
(Unincorporated Areas)
Union Park Hollow USACE Rock EMW-91-E- City of Sageville,
Creek 10/18/2011 Island District 3529 �uly 1992 Dubuque County
(Unincorporated Areas)
Ciry of Asbury,
City of Cascade,
City of Dubuque,
Dubuque County
lowa Flood (Unincorporated Areas),
City of Durango,
Center and City of Dyersville,
All approximate TBp IIHR ES07385SR Z�4/2014 City of Epworth,
flooding sources Hydroscience ALST100332 City of Graf,
and City of Luxemburg,
Engineering City of New Vienna,
City of Peosta,
City of Rickardsville,
City of Sageviile,
City of Worthington, City
of Zwin le
76 �
7.2 Community Meetings
The dztes of the com�nunity meetings held for tl�is FIS project and any previous FIS projects are
shown in Table 3Q These meetings may have previously been referred to by a variety of names
(Co�mnunity Coordination Officer (CCO), Scoping, Discovery, etc.), but all meetings represent
opportanities for FEMA, commnnity officials, shidy conh'actors, and other invited guests to
discuss the�lanning for and results of the project.
77
I
Table 30: Community Meetings
Communiry RS Report Dated Date of Meeting Meeting Type Aftended By
June 2,2011 ugust 25,2005 IniCial Communiry FEMA,Black&Veatch,and the communities
Consultation Officer
Final Community
June 2,2011 February 23,2010 ConsWtation Officer FEMA,Black&Veatch,and the communities
Dubuque County,Iowa
and Incorporated Areas Draft Flood Hazard Product
TBD pril 12,2017 Review Meeting lowa DNR,Stantec,and lhe communities
Final Community
TBD TBD Consultation Officer TB�
78
SECTION 8.0 - ADDITIONAL INFORMATION
Informatiou conce�ning dte pertinent dzta used in the preparation of tliis �IS Report can be
obtained by submitting an order �vith auy reqnirecl payment to the FEMA En�neering Library.
For more infonnation on tl�is�rocess,see http://www.fen�a.gov.
Table 31 is a ]ist of the locations where FIRMs for Dubuque County can be viewed. Please note
that the maps at fliese locations are for reference only and are not for distribution. Also, please
note that only tlie maps for the commimify listed i�i the table are availeble at that particular
repository. A user may need to visit another repository to view maps fiom an adjacent
communit�.
Table 31: Map Repositories
Communiry Address City State Zip Code
City Hall
City of Asbury 5080 Asbury Road Asbury IA 52002
Dubuque County Courthouse
City of Balitown 720 Central Avenue Dubuque IA 52001
Dubuque County Courthouse
City of Bankston 720 Central Avenue Dubuque IA 52001
City Hall
City of Bernard 549 Leffler Street Bernard IA 52032
City Hall
CityofCascade 3201stAvenueWest Cascade IA 52033
Dubuque County Courthouse
City of Centralia 720 Central Avenue Dubuque IA 52001
City Hall
City of Dubuque 50 West 13th Street Dubuque IA 52001
Dubuque County Dubuque County Courthouse
(Unincorporated Areas) �20 Central Avenue Dubuque County IA 52001
City Hall
City of Durango 833 U.S. Highway 52 North Durango IA 52039
City Hall
City of Dyersville 340 1st Avenue East Dyersville IA 52040
City Hall
City of Epworth 191 Jacoby Drive East Epworth IA 52045
79
1
Table 31: Map Repositories (continued)
Community Address City State Zip Code
City Hall
City of Farley 301 First Street Northeast Farley IA 52046
City Hall
City of Graf 617 Graf Road Graf IA 52039
City Hall
City of Holy Cross 938 Church Street 11o1y Cross IA 52053
City Hall
City of Luxemburg 202 South Andres Street Luxemburg IA 52056
City Hall
City of New Vienna 7271 Columbus Street New Vienna IA 52065
City Hall
Ciry of Peosta 7896 Burds Road Peosta IA 52068
City Hall
City of Rickardsville 20494 St. Joseph's Drive Rickardsville IA 52039
City Hall
City of Sageville 11439 Robinhood Drive Sageville IA 52001
City Hall
City of Sherrill 5309 South Mound Road Sherrill IA 52073
City Hall
City of Worthington 216 1st Ave West Worthington IA 52078
City Hall
City of Zwingle 80 Walnut Street Zwingle IA 52079
The National Flood Hazard Layer (NFHL) dataset is a compilatiou of effectivc FIRM databases
and LOMCs. Together they create a GIS data layer for a State or Tenitory. The NFHL is u�dated
as studies become effective and exYracts are made available to the public monthly.NFHL data can
be viewed or ordered from the�vebsite shown in TaUle 32.
Table 32 contains usefu] contact infoimation regarding the FIS Report, the FIRM, and other i
relevant flood hazard arld GIS clata. In addition,infoimation aUout the state NPIP Coordinator a�td
GIS Coordinator is shown in tl�is table. At die request of FEMA, each Goveinor has desiguated
an agency of State or Cen�itorial goverument to coordinate that State's o�terrirory's NFIP activities.
These agencies often assist communities in clevelo�ii�g and adopting necessary floodplain
managenient measures. State GIS Coordii�afors are knowledgeable about the availabiliry and '
locarion of state and local GIS data in theu s(ate.
so
Table 32: Additional Information
FEMA and the NFIP
FEMA and FEMA http://www.fema.qov
Engineering Library website
NFIP website http//www.fema.qov/business/nfip
NFHL Dataset http'//msc.fema.qov
FEMA Region VII 11224 Holmes Road
Kansas City, Missouri 64131-3626
Telephone: (816)283-7073
Other Federai Agencies
USGS website http://www.usqs.qov
Hydraulic Engineering Cenier http//www hec usace armv.mil
website
State Agencies and Organizations
State NFIP Coordinator State National Floodplain Insurance Program (NFIP)
Coordinator
Bill Cappuccio
lowa Dept. of Natural Resources
Wallace State Office Bldg.
Des Moines, IA 50319
515-281-8942 FAX 515-281-8895
bill.cappuccio@dnr.state.ia.us
State GIS Coordinator State GIS Coordinator
Patrick Wilke-Brown
lowa Dept. of Natural Resources
Wallace State Office Bldg.
Des Moines, IA 50319
515-281-6905
patrick.wilke-brown@d nr.iowa.gov
SECTION 9.0 — BIBLIOGRAPHY AND REFERENCES
Tzble 33 ivcludes so��rces used in tlie preparation of and cited in this FIS Report as well �s
additional sfudies that l�ave beei� conducted in Lhe study area.
81
I
Table 33: Bibliography and References
Publication
Publication Tifle, Datel
Citation published "Article,"Volume, Place of Date of
in this FIS issuer Number,etc. AuthodEditor Publicalion Issuance Link
lowa Department
lowa Department of of NaNral lowa City,
Base Map Natural Resources Resources lowa 2009
IDOT, 2070-IDOT, lowa Depadment
lowa Deparfment of LRFD of Natural lowa City, http�./Iwww.iowadot.qovlbridqel
Hydrology NaNral Resources Design Manual Resources lowa 2014 manuallrfd.html
Bulletin No. 178,
US.Water Guidelines/or U.S.Water
Resources Determining Flood Flow Resources 1977
Hydrology Council Frequency Council Revised 1981
HEC-7 Flood
Hydrogreph Package,
Generalized Compute� September
Hydrology USACE Prog�am. Version 4.0 USACE 1990
Detailed Project Report
forFlood Control. Rock Island
Hydrology USACE Monticello, lowa USACE District, IL October 1974
Regional Flood
Frequency lowa State
lowa State Determinations in lowa, University
Hydrology University Library M,S. Thesis Hermanson,R.E Llbrary 1964
82
Table 33: Bibliography and References(continued)
Publication
PublicaGbn 7itle, Datel
Citalion publisherl "Atlide,"Volume, Place of Date of
in this FIS Issuer Number,etc. AuthodEditor Publication Issuance Link
lowa Naturel Resources
Council Bulletin No. 71,
Floods in lowa:
USGS&The Technical
lowa Natural Manual/orEstimating
Resources Council their Magnitude and
Hydrology Cooperating Frequency Oscar,G.Lara March 1973
Techniques for
Estimating Flood-
Frequency Discharges
for Stream in lowa:
Techniques fai
Estimating Flood-
Frequency Discharges
Hydrology USGS (orStreaminlowa Eash,David 2001
HEC-RAS River
Analysis
System. Version 4.1.0. Davis,
Hydraulics USACE (So(twaieJ USACE California May 2010
IDOT, 2070-IDOT, lowa Depertment
lowa Department of LRFD of NaWral lowa City, http�llwww iowadoLqov/bridqel
Hydraulics NaWral Resources Design Manual Resources lowa 2014 manuallr(d.html
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