The URL can be used to link to this page

Home My WebLink About2013-09-17-City-Council-PresentationCity Council Work Session September 17, 2013 Project background NEPA Process and findings Design option decisions •Level of protection for Dubuque Street •Backwater Reduction goal for the bridge •Structure Type for the bridge Impacts of the Do-Nothing Alternative Council Q&A Normal Conditions 2008 Flood This project is being led by the City of Iowa City in cooperation with: University of Iowa Metropolitan Planning Organization of Johnson County (MPOJC) Project GREEN Iowa Department of Transportation (DOT) Federal Highway Administration (FHWA) Economic Development Administration (EDA) Goals Improve the reliability of Dubuque Street Improve the reliability of Park Road & Bridge Reduce the backwater created by Park Road Bridge Provide needed infrastructure improvements Better serve bicyclists and pedestrians Preserve and enhance the natural entry Gateway Project - $40 Million U.S. Department of Commerce, Economic Development Administration – $3 Million Transportation, Housing & Urban Development – $1.5 Million SAFETEA-LU Surface Transportation Program – $6 Million Local Option Sales Tax – $25.8 Million G.O. Bonds – $3.7 Million Gateway Project - $40 Million U.S. Department of Commerce, Economic Development Admin. $3 Million Transportation, Housing & Urban Development – $1.5 Million SAFETEA-LU Surface Transportation Program – $6 Million Local Option Sales Tax – $25.8 Million G.O. Bonds – $3.7 Million Park Road 3rd Lane Improvement - $1.44 Million G.O. Bonds - $1.44 Million North River Corridor Trunk Sewer Reconstruction - $4.4 Million Wastewater Operations - $4.4 Million Gateway Project - $40 Million U.S. Department of Commerce, Economic Development Admin. $3 Million Transportation, Housing & Urban Development – $1.5 Million SAFETEA-LU Surface Transportation Program – $6 Million Local Option Sales Tax – $25.8 Million G.O. Bonds – $3.7 Million Park Road 3rd Lane Improvement - $1.44 Million G.O. Bonds - $1.44 Million North River Corridor Trunk Sewer Reconstruction - $4.4 Million Wastewater Operations - $4.4 Million Phase 1: Plan - NEPA evaluation - Planning process - Required for federal funds Phase 2: Design - After completing NEPA -Detailed engineering & final design - 12 to 15 months Phase 3: Build -2 construction seasons -Bid in December 2014 -Begin construction in 2015 for fall 2016 completion National Environmental Policy Act (1969) Required for federally funded or permitted projects Conduct prior to design and construction Evaluate impacts to both natural and social (man-made) environment Follows one of three types of process/documents •Environmental Impact Statement •Environmental Assessment •Categorical Exclusion Completed: Data collection Flood model data updated Initial alternatives screening Purpose and Need approved Two public meetings Refine alternatives Screen alternatives Recommend preferred alternative Prepare NEPA document Resource Agency coordination Release NEPA document for review Hosted Public Hearing To Do: Receive Federal approval Keep talking with stakeholders Advance to design and construction Why do the project: The purpose of the proposed action is to provide a reliable multimodal transportation corridor that reduces the impact of flooding on the local transportation system and the Iowa River corridor. Need for the Proposed Action: Maximize the reliability of Dubuque Street Maximize the reliability of Park Road Bridge Minimize backwater created by Park Road Bridge Address existing roadway deficiencies on Dubuque Street and Park Road Community Input Agency Review Community Input Impact Evaluation Community Input Purpose and Need NE P A P r o c e s s / T i m e Environmental Assessment Off-Alignment •Dodge/Governor •First Avenue/Highway 6 •Foster Road/Prairie du Chien On-Dubuque Street Off-Dubuque Street •Lower City Park •Taft Speedway •Louis Place •Foster Road Cable Stayed – Steel or concrete Similar to Mississippi River Bridge in Burlington, Iowa Girder Bridge Steel or concrete Similar to existing Park Road Bridge Open Spandrel Deck Arch Steel or concrete Similar to Iowa Avenue Bridge Build 1 foot above 500 year floodplain Improve bike/ped/trail connections Maintain parkway feel New bridge •Low steel to pass 500 year flood •5 lanes of travel •Longer spans •Located south of existing Park Road Bridge Girder bridge Located south of existing bridge Five travel lanes 10’ Multipurpose paths on each side Similar transit access Least expensive bridge type Fewer piers in the water Perpendicular with river Minimizes backwater Impact area and Category • 0.94 acres Wetlands • 5.1 acres Grading impacts to public parks/open space • 1.2 acres Historic Sites or Districts (no buildings or resources) •15.4 acres 100 Year Floodplain •17.9 acres 500 Year Floodplain • 0.92 acres Acquired ROW •0.2 acres residential •0.5 acres parks/open space •0.4 acres university of Iowa Led by Office of State Archaeologist and Tallgrass Historians Coordinated with: •Iowa City Historic Preservation Commission •Iowa DOT Cultural Resource staff •State Historic Preservation Officer Received finding of Conditional No Effect summer 2012 Affirmed by independent evaluation summer 2013 Two public meetings: 250+ attendees Drop-in center + online public meeting Public hearing/drop-in center Multiple paid ads Local media press releases City and project specific Web site Mailing list of nearly 2,000 Neighborhood and civic group meetings Multiple one-on-one meetings and calls with City staff Federal Highway Administration Finding of No Significant Impact Economic Development Administration Section 4(f) De Minimis Iowa Department of Transportation Conditional No Adverse Effect State Historical Society of Iowa Conditional No Adverse Effect Iowa Highway Archaeology Program Concur with Conditional No Adverse Effect Iowa City Historic Preservation Commission Letter of Project Support to SHPO Other Agencies •Natural Resource Conservation Service Federal Aviation Administration •U.S. Army Corp of Engineers U.S. EPA •U.S. Fish and Wildlife U.S. Coast Guard •Tribal coordination Iowa DNR •MPO Johnson County Roadway Elevation – protect 1’ above •100 year floodplain •2008 flood elevation •500 year floodplain Bridge Elevation – protect 1’ above •100 year floodplain •2008 flood elevation •500 year floodplain Backwater Reduction Type •Girder •Open spandrel deck arch 500-year flood elevation +1’ (protection level required for structures constructed in a floodplain) 2008 flood event elevation +1’ 100-year flood elevation +1’ (minimum protection required for federal funding) No build/existing elevation * The level of protection can been anywhere between the 100- year and the 500-year flood elevations Parameters Foster to Kimball Flood protection/elevation Grading impacts Construction / Constructability Pros and Cons Increase in elevation Improves flood protection Improves roadway availability Maximizes release from reservoir Increases grading impacts Increases cost More difficult to construct 10’ Iowa River Trail on Dubuque St. 8’ sidewalk Brown to Foster 10’ multiuse paths on bridge Split grade crossing on west side 8’ sidewalk both sides of Park Rd. 8’ clear space for pedestrian safety and snow storage Type: •Haunched girder, •Deck arch / Through Arch •Cable stayed Elevation – Protection and backwater reduction Common features of each bridge: •Number of travel lanes •Bike/ped/transit amenities •Bridge deck dimensions •Number of Piers Parameters Cost Flood protection elevation Backwater reduction Grading impacts at intersection Constructability Pros and Cons Arch bridge $2.5-3 Million more Arch bridge more complex Increase in elevation •Improves flood protection •Improves roadway availability •Maximizes release from reservoir •Minimizes backwater •Increases grading impacts •Increases cost •More difficult to construct Flood event Girder bridge at 500+1 Arch at 500+1 50 year flood about 1” reduction about 0.5” reduction 100 year flood 2 – 3” reduction 1 – 2” reduction 2008 flood 10” reduction 8 – 9” reduction 500 year flood 7 – 8” reduction 7” reduction Each option performs better than current bridge No option eliminates all backwater Girder bridge performs slightly better than an Arch bridge Roadway Option w/ Deck Arch 500+1 w/ Girder 500+1 Roadway 500+1 $39.9M $36.6M Roadway 2008+1 $38.6M $35.3M Roadway 100+1 $36.9M $34.2M Deck Arch 2008+1 Girder 2008+1 Roadway 2008+1 $38.4M $35.0M Roadway 100+1 $36.7M $33.4M Deck Arch 100+1 Girder 100+1 Roadway 100+1 $36M $32.6M Environmental Assessment, Final Design, Construction Administration and Inspection fees = $8- 9Million. Trunk sewer reconstruction not included in these costs. The following work would still need to occur: Reconstruct North Corridor Trunk Sewer Replace Dubuque Street pavement Replacement / Major Repair of Park Road Bridge Widen Park Road to three lanes to Riverside Drive Right turn lane at SB Dubuque Street to WB Park Road Upgrade aging water, storm sewer, lighting, overhead utilities Cost of above: Approximately $31.7 Million Receive FHWA approval / Finding of No Significant Impact Determine the right balance for the following: •Dubuque Street Elevation: Level of protection versus amount of fill and related externalities •Park Road Bridge Elevation: Backwater reductions versus elevation of the Dubuque Street / Park Road intersection •Bridge Type: Appearance and elevation advantages versus cost Begin Final Design