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7 6 09 Riverfront Marina Worksession JJR Presentation_FINALPort of Dubuque, Iowa Riverfront Marina Project City Council Working Meeting -Marina Alternatives July 6, 2009 Railroad BridgeRailroad Bridge Star BreweryStar Brewery Grand River CenterGrand River Center Existing Existing transient dockstransient docks IHbIHbceceararoror IIHHbb Existing Sites 1 Main Channel AlternativeMain Channel Alternative Ice Harbor AlternativeIce Harbor Alternative Alternative Marina Locations 585 580 575 575 570 590 590 565 560 585 585 550 580 580 575 570 575 565 560 555 570 565 560 Flat Pool = 592.07 MSL12 Main Channel Existing Bathymetry 2 Star BreweryStar Brewery River walkRiver walk Grand River CenterGrand River Center Minimum 100ftMinimum 100ft Debris Debris Deflection Deflection StructureStructure Railroad Railroad BridgeBridge River FlowRiver Flow Marina Alternative 1: Main Channel Design ConsiderationsDesign Considerations Minimum 100’ Set Back From Railroad Bridge • River Velocities 2.5fps to 4.5fps • Wave Heights up to 2’ and Boat Wakes (Long Period • W)aves W) Ice • Debris • Water Depths –Range from 6’ to 40’ (From Flat Pool) • Access From River Walk –Grade Issues • Utilities • Utiliti Parking • Eagle Roosting Habitat • Main Channel Alternative 3 AdvantagesAdvantages Boat Access Directly from Main Channel • Minimal Amount of Initial Dredging • DisadvantagesDisadvantages DisadvantagesDisadvantages Navigability Issues Near Railroad Bridge • Wave Conditions • Requires Diversion Structure for Ice Flows and Debris • Water Depth and Open Channel Environment Increase Construction • Costs No Amenities or Utilities • Maintenance Dredging • Main Channel -Pros and Cons Conceptual Cost SummaryConceptual Cost Summary 1.Marina Improvements (Approximately 67 slips) = $ 2,800,000 2.Amenities and Utilities = None 3.Deflection Structures $2,500,000 (Stone Dike) • $2,000,000 (Sheet Pile) • $1,500,000 (Caisson Piling) • $1,200,000 (Floating Concrete) • 4.Total Estimated Cost Range = $4,000,000 to $5,300,000 Main Channel –Conceptual Costs 4 585 585 580 580 580 585 Ice Harbor Existing Bathymetry Ice Harbor Alternative 5 Design ConsiderationsDesign Considerations National Mississippi River Museum Campus Shared Use • Coordination Mississippi River Rides Location and Configuration • Requirements Requirements Newt Marine Barge Turning Requirements • Coast Guard Space Requirements • Ice Harbor Alternative AdvantagesAdvantages •Protected Harbor No Debris • No Ice • Limited Wake • Minimal Water Level Fluctuations • •Ease of Access •Central Location •True ADA Accessibility •Amenities and Utilities •Adjacent Utility Service •Adjacent Space for Fuel Tank Locations •Achieve All Programming Elements within Budget •Grant Transferable to this Location •Space for a Marina Services Building DisadvantagesDisadvantages •Possible Minor Initial Dredging •Competing Adjacent Uses Ice Harbor -Pros and Cons 6 Conceptual Cost SummaryConceptual Cost Summary 1.Marina Improvements = $ (Approximately 59 additional slips) 2,400,000 2.Amenities and Utilities = $1,500,000 3.Total Estimated Cost Range = $3,900,000 Ice Harbor –Conceptual Costs Bettendorf, IA Deflection Structures and Promenades 7 Portland, OR Deflection Structures and Promenades Design Features: Gangways 8 ADA Accessible Design Features: Gangways Design Features: Docks 9 Design Features: Fuel Docks Port of Dubuque, Iowa Riverfront Marina Project City Council Working Meeting -Marina Alternatives July 6, 2009 10