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
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
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
18. 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
19. Iowa ROW Summary
ROW Purchased (Central & North Sections)
• 47 Parcels
• $6.9 Million
ROW to be Purchased (Central Section)
• 79 Parcels
• $16.9 Million
20. Illinois ROW Summary
ROW Purchased
• 7 Parcels
• $0.7 Million
ROW to be Purchased
• 59 Parcels
• $3.8 Million
21. 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
22. 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
23. 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
24. 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
26. 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
27. 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
The Draft EIS in 2003 included 3 river crossing options and 2 interchange configurations at each local service interchange. In January 2005, the DOTs along with the MPO Bi-State, identified at the Preferred Alternative. For each interchange location, the community where the interchange was located was consulted about their preferences for the local access configuration. In 2004, we undertook additional traffic and operational studies in Davenport, Bettendorf and Moline to confirm the interchange operations and gain a consensus on the preferred design. This was a key element and the DOTs and study team took great efforts to work with our local partners so each jurisdiction was in support of the Preferred Alternative. I-74 would be widened and reconstructed to 3 basic lanes in each direction, with auxilliary lanes in much of the corridor. I-74 would be widened and reconstructed to 3 basic lanes in each direction, with auxilliary lanes in much of the corridor.