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I-74 Iowa-Illinois Corridor

I-74 Iowa-Illinois Corridor. Presentation to: Iowa DOT Commission May 8, 2012 Ames, Iowa Mitchell Dillavou– Director, Engineering Bureau. 1935. Original bridge opened. Cost: $1.5 million. 1960. Second bridge opened. Cost: $6.2 million. 1970’s. Iowa and Illinois took over ownership

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I-74 Iowa-Illinois Corridor

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  1. I-74 Iowa-Illinois Corridor Presentation to: Iowa DOT Commission May 8, 2012 Ames, Iowa Mitchell Dillavou– Director, Engineering Bureau

  2. 1935 Original bridge opened. Cost: $1.5 million

  3. 1960 Second bridge opened. Cost: $6.2 million

  4. 1970’s Iowa and Illinois took over ownership Toll Booths Removed. I-74 was connected.

  5. Today 2010 traffic: 61,500 vehicles per day 2035 estimated traffic: 98,500 VPD Poor geometrics for an interstate route The bridges are functionally obsolete

  6. 1998 Major Investment StudyNeeded Improvement Locations

  7. I-74 Corridor Study Milestones • 2000: I-74 Corridor Study began • 2003: Draft Environmental Impact Study completed • 2005: Preferred Alternative identified • 2006: Main Span Bridge Type chosen • 2007: Preliminary Engineering completed • 2009: Final Environmental Impact Study, and Federal Highway Admin. Record of Decision

  8. Corridor Study Limits

  9. Mississippi River Crossing Preferred Alternative

  10. Finalist Bridge Types • Scheme 1 - Basket Handle True Arch Twin Bridge • Aerial view • River view • Bettendorf shoreline view • Approach view • Motorist’s view

  11. Finalist Bridge Types • Scheme 2 - Modified Basket Handle Tied Arch Twin Bridges with Vertical Pier and Vertical Hangers • Aerial view • River view • Bettendorf shoreline view • Approach view • Motorist’s view

  12. Finalist Bridge Types • Scheme 3 - Basket Handle Tied Arch Twin Bridges with Vertical Pier and Vertical Hangers • Aerial view • River view • Bettendorf shoreline view • Approach view • Motorist’s view

  13. Finalist Bridge Types • Scheme 4 - Cable Stayed Single Bridge with Semi-Fan Stay Arrangement • Aerial view • River view • Bettendorf shoreline view • Approach view • Motorist’s view

  14. Selected Alternative: Basket Handle True Arch Twin Bridge

  15. I-74 Project Locations

  16. Central Section Cost Estimate (YOE)

  17. Central Section Design Preliminary Design • Completed in April 2009 • $9.1 Million in Consultant Services (Iowa share) • $0.3 Million Iowa DOT Staff Final Design • $9.7 Million expended to date (Iowa Share) • 71% Complete • $13.0 Million Consultant Services funds to be expended (Iowa share) • $5.5 Million Iowa DOT Staff funds to be expended

  18. Iowa ROW Summary ROW Purchased (Central & North Sections) • 47 Parcels • $6.9 Million ROW to be Purchased (Central Section) • 79 Parcels • $16.9 Million

  19. Illinois ROW Summary ROW Purchased • 7 Parcels • $0.7 Million ROW to be Purchased • 59 Parcels • $3.8 Million

  20. Iowa Investment to Date • ROW $ 6.9 Million • Design $19.5 Million • Construction $16.3 Million • Iowa DOT Staff $ 2.1 Million Total $44.8 Million

  21. Iowa Cost Estimate Phase I 2013-2017 ROW $16.9 M Construction $13.7 M Maintenance of Existing Bridges $ 2.3 M Iowa DOT Staff $ 5.5 M Consultant Engineering (design) $13.0 M $51.4 M

  22. Iowa Cost Estimate Phase II – Central Section Beyond 2017, $ in YOE Main Span $118.2 M Approach Span $123.1 M Viaducts $128.9 M Mainline Roadway $ 40.2 M Bridge Demolition $ 15.3 M Maintenance of Existing Bridges $ 3.5 M Lighting, Signing, Landscaping, ITS $ 23.5 M Consultant Engineering (Constr.) $ 40.9 M Iowa DOT Staff $ 1.0 M $494.6 M

  23. Illinois Cost Estimate Phase II – Central Section Beyond 2017, $ in YOE Main Span $118.2 M Approach Span $123.1 M Viaducts & Mainline Roadway $356.1 M Bridge Demolition $ 17.2 M Lighting, Landscaping, ITS $ 10.1 M Consultant Engineering (Constr.) $ 40.9 M $665.6 M

  24. Central Section Cost Estimate YOE IOWA ILLINOIS $494.6 M $665.6 M

  25. Iowa Cost Estimate Totals • Completed Work $ 44.8 M • Phase I $ 51.4 M • Phase II $494.6 M • Phase III (North Section) $202.5 M Total Cost $793.3 M

  26. Anticipated Maintenance Cost (Iowa Share) Option 1 – In service until 2025 • Main Bridge $ 3.0 M • Approach Bridges $ 2.8 M • Total $ 5.8 M Option 2 – In service until 2035 • Main Bridge $14.2 M • Approach Bridges $ 8.7 M • Total $22.9 M

  27. Corridor Federal Funding • Earmarks $74.6 Million • Unobligated Amount $ 7.2 Million

  28. Questions?

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