SW Arterial US 20, US151-61 Interchange EnhancementsMasterpiece on the Mississippi
TO: The Honorable Mayor and City Council Members
FROM: Michael C. Van Milligen, City Manager
SUBJECT: Southwest Arterial - Bridge Enhancements
US 20 Interchange and US 151 -61 Interchange
DATE: January 19, 2012
Dubuque
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All-America City
1
2007
Due to the significant visual impact that the Southwest Arterial / US 20 Interchange and
the Southwest Arterial / US 151 -61 Interchange will have to motorists as they enter the
City, staff is recommending that the interchange bridges have a "Gateway" appearance.
It is recommended that the "Gateway" appearance be achieved by integrating unique
and context sensitive components to the bridge structures and associated features.
A partial list of preferred bridge enhancement elements are:
• Materials that compliment the historical use of native limestone found so
prominently in the Dubuque area.
• Bridge piers with a scale and material appearance reminiscent of historical
Dubuque based structures and icons.
• Steel -arch truss bridge members over the main bridge span in keeping with
Dubuque's visual bridge identity.
• High efficiency and high impact enhancement lighting to allow the bridge
structure to illuminate at night to create a signature visual presence.
The design team members had a strong preference to maintain some visual scale and
material continuity along the Southwest Arterial corridor bridges. This would be
achieved by incorporating many of the same design components and enhancement
treatments that were used on the recently constructed Southwest Arterial / North
Cascade Road Bridge and the future English Mill and Military Road Bridges.
City Engineer Gus Psihoyos recommends that the City Council approve the staff
recommendation to proceed with bridge enhancement Option No. 1 for the US 20
Interchange and the US 151 -61 Interchange and support of the proposed bridge
enhancement design elements to be incorporated into the Final Design phase of the
Southwest Arterial project.
Assistant City Engineer Bob Schiesl will have a short presentation.
I concur with the recommendation and respectfully request Mayor and City Council
approval.
Michael C. Van Milligen
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Attachment
cc: Barry Lindahl, City Attorney
Cindy Steinhauser, Assistant City Manager
Gus Psihoyos, City Engineer
2
THE CITY OF
Dui �" E
Masterpiece on the Mississippi
TO: Michael C. Van Milligen, City Manager
FROM: Gus Psihoyos, City Engineer
DATE: January 19, 2012
SUBJECT: Southwest Arterial - Bridge Enhancements
US 20 Interchange and US 151 -61 Interchange
INTRODUCTION
Dubuque
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All-AmericaCity
11111!
2007
This memorandum is to request City Council approval on the bridge enhancement
recommendations for the US 20 Interchange and the US 151 -61 Interchange and
request support of the proposed design elements to be incorporated into the Final
Design phase of the Southwest Arterial project.
BACKGROUND
Due to the significant visual impact that the Southwest Arterial / US 20 Interchange and
the Southwest Arterial / US 151 -61 Interchange will have to motorist as they enter the
City, staff is recommending that the interchange bridges have a "Gateway" appearance.
It is recommended that the "Gateway" appearance be achieved by integrating unique
and context sensitive components to the bridge structures and associated features.
DISCUSSION
City staff along with members of the Southwest Arterial design team conducted a visual
preferencing exercise in which members were shown approximately 250 pictures of
various bridges types, spans, configurations, signature bridges, architectural elements,
enhancement features, materials, landscaping and lighting. Team members were given
approximately 5 seconds to view and rate each of the randomly generated visual
images. Results of the exercise were then utilized by the design team to advance,
evaluate, and recommend ideas that were ultimately carried forward into conceptual
renderings.
A partial list of preferred bridge enhancement elements are as follows:
• Materials that compliment the historical use of native limestone found so
prominently in the Dubuque area.
• Bridge piers with a scale and material appearance reminiscent of historical
Dubuque based structures and icons.
• Steel -arch truss bridge members over the main bridge span in keeping with
Dubuque's visual bridge identity.
• High efficiency and high impact enhancement lighting to allow the bridge
structure to illuminate at night to create a signature visual presence.
The design team members also had a strong preference to maintain some visual scale
and material continuity along the Southwest Arterial corridor bridges. This would be
achieved by incorporate many of the same design components and enhancement
treatments that were used on the recently constructed Southwest Arterial / North
Cascade Road Bridge and the future English Mill and Military Road Bridges.
Additionally, the bridge enhancements for the North Cascade Road Bridge were
presented at several public informational meetings and were well received by the public.
The North Cascade Road Bridge bridge used cast -in -place concrete formliners to
replicate cut limestone on the bridge piers, pier caps, abutment walls and barrier rails.
The North Cascade Road Bridge will also have enhanced piers that extend above the
bridge deck, along with decorative LED roadway lighting and decorative bridge railing.
Based on the above list of preferred bridge enhancement elements, the design team,
including RDG Planning & Design, WHKS, and AECOM developed multiple conceptual
design renderings for City staff members to review and provide comments. The
conceptual design renderings were then further refined based on visual element
preferences. Staff members then narrowed the conceptual renderings selection to three
(3) preferred alternatives. The design team then prepared 3- dimensional perspective
renderings for staff to review. The perspective renderings allowed staff to visualize the
bridge enhancements from multiple vantage points, including both daytime and night
time views with enhancement lighting concepts.
PROJECT COST CONSIDERATIONS
The consultant bridge design team evaluated the three (3) preferred bridge
enhancement concepts and provided the following planning level cost projections.
Option No. 1 - Projected Construction Cost
Base Bridge Cost: $4.5 - $5.0 Million
Bridge Enhancements: $2.25 - $2.75 Million
Total Bridge Cost: $6.75 - $7.75 Million
Option No. 2 & 3 - Projected Construction Cost
Base Bridge Cost:
Bridge Enhancements:
Total Bridge Cost:
$4.5 - $5.0 Million
$3.25 - $4.0 Million
$7.75 - $9.0 Million
BRIDGE ENHANCEMENT RECOMMENDATIONS
Based on the visual preferencing exercise conducted, the multiple conceptual design
renderings evaluated and considered, City staff is recommending proceeding with
conceptual Option No. 1. Staff has provided an attached copy of several of the
conceptual design renderings that were developed and considered during the selection
process. Staff will also be presenting before City Council members a brief powerpoint
presentation which will summarize the review process and the preferred alternative
selected.
RECOMMENDATION
Based on the comprehensive and creative selection process that was implemented and
the positive public input received on the bridge enhancement treatments used on the
North Cascade Road Bridge along with maintaining visual scale and material continuity
along the Southwest Arterial corridor. I recommend that the City Council approve the
staff recommendation on the bridge enhancements for the US 20 Interchange and the
US 151 -61 Interchange and support of the proposed design elements to be
incorporated into the Final Design phase of the Southwest Arterial project.
ACTION TO BE TAKEN
I recommend that the City Council approve the staff recommendation to proceeding with
bridge enhancement Option No. 1 for the US 20 Interchange and the US 151 -61
Interchange and support of the proposed bridge enhancement design elements to be
incorporated into the Final Design phase of the Southwest Arterial project.
Attachments
Prepared by: Robert Schiesl, Assistant City Engineer
cc: Kent Ellis, Iowa DOT, Local Systems Engineer
Roger Walton, District Bridge Engineer
Bob Lentz, AECOM
Pat Dunn, RDG
Tony Zelinskas, WHKS & Co.
F \PROJECTS \SW ARTERIAL - IA HYW 32 \Bridge Enhancements
THE CITY OF
DUB'5' E
Masterpiece on the Mississippi
Southwest
Arterial
SWA Overpass Bridge
US 20 & Southwest Arterial Interchange
October 29, 2011 — Revised December 13, 2011
Prepared by RDG Planning & Design
In cooperation with AECOM & WHKS
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Prelimina Desi•n — Visual Listenin. and Ins•iration
SWA Overpass Bridge Concepts
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SWA Overpass Bridge Concepts
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Prelimina Desi.n O•tions — Round Two
Prelimina Desi•n O•tions — Three Preferred O•tions
Option 1
Option 2
Option 3
Recommendation — 0 •tions 1 2 or 3
0 •tion 1 - US 20 1 Southwest Arterial Bride
O•tion 1 - US 20 1 Southwest Arterial Bride
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O•tion 1 - US 20 1 Southwest Arterial Bride
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O•tion 2 - US 20 1 Southwest Arterial Bride
O•tion 2 - US 20 1 Southwest Arterial Bride
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O•tion 2 - US 20 1 Southwest Arterial Bride
O•tion 2 - US 20 1 Southwest Arterial Bride
O•tion 2 - US 20 1 Southwest Arterial Bride
O•tion 2 - US 20 1 Southwest Arterial Bride
O•tion 3B Dark Color — US 20 1 Southwest Arterial Brid• e
O•tion 3B Dark Color — US 20 1 Southwest Arterial Brid• e
0 •tion 3B Dark Color — US 20 1 Southwest Arterial Brid• e
O•tion 3B Dark Color — US 20 1 Southwest Arterial Brid• e
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Considerations:
• Hwy 20 very symmetrical, Hwy 151/61 not symmetrical
• Hwy 20 has 5 spans, Hwy 151/61 has 4 spans
• Hwy 151/61 requires additional conceptualization beyond the very preliminary concept
applications shown below
Hwy 20
Option 1
Option 2
Option 3
Hwy 151/61
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Considerations — Desi•n A••Iication to the H 151/61 Interchan•e Bride
Option 3
Projected Construction Cost (option 1)
Base Bridge Cost: $4.5 — 5.0 Million
Bridge Enhancements: $2.25 — 2.75 Million
Total Bridge: $6.75 — 7.75 Million
Projected Construction Cost (option 2 & 3)
Base Bridge Cost: $4.5 — 5.0 Million
Bridge Enhancements: $3.25 — 4.0 Million
Total Bridge: $7.75 — 9.0 Million
Considerations — Pro.ected Costs
Southwest
Arterial
Next Steps
• Design Team Coordination
• Formal City and Iowa DOT Feedback
• Directive to Move Into Final Design