I-74 Iowa-Illinois Corridor

Presentation to:

Iowa DOT CommissionMay 8, 2012Ames, Iowa

Mitchell Dillavou– Director, Engineering Bureau

• Original bridge Original bridge opened.opened.

• Cost: $1.5 millionCost: $1.5 million

19351935

• Second bridge Second bridge opened.opened.

• Cost: $6.2 millionCost: $6.2 million

19601960

1970’s1970’s

• Iowa and Illinois took Iowa and Illinois took over ownershipover ownership

• Toll Booths Removed.Toll Booths Removed.

• I-74 was connected.I-74 was connected.

TodayToday• 2010 traffic: 61,500 2010 traffic: 61,500

vehicles per dayvehicles per day

• 2035 estimated 2035 estimated traffic: 98,500 VPDtraffic: 98,500 VPD

• Poor geometrics for Poor geometrics for an interstate routean interstate route

• The bridges are The bridges are functionally obsoletefunctionally obsolete

1998 Major Investment Study Needed Improvement Locations

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

Corridor Study Limits

Mississippi River Crossing

Preferred Alternative

•Approach view

•River view•Aerial view

•Bettendorf shoreline view

• Scheme 1 - Basket Handle True Arch Twin Bridge

•Motorist’s view

Finalist Bridge Types

•Scheme 2 - Modified Basket Handle Tied Arch Twin Bridges with Vertical Pier and Vertical Hangers

•Motorist’s view

•Aerial view •River view

•Approach view

•Bettendorf shoreline view

Finalist Bridge Types

•Scheme 3 - Basket Handle Tied Arch Twin Bridges with Vertical Pier and Vertical Hangers

•Approach view

•River view•Aerial view

•Bettendorf shoreline view

•Motorist’s view

Finalist Bridge Types

• Scheme 4 - Cable Stayed Single Bridge with Semi-Fan Stay Arrangement

•Approach view

•River view

•Motorist’s view

•Bettendorf shoreline view

•Aerial view

Finalist Bridge Types

Selected Alternative: Basket Handle True Arch Twin Bridge

I-74 Project Locations

Central Section Cost Estimate (YOE)

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

Iowa ROW Summary

ROW Purchased (Central & North Sections)• 47 Parcels• $6.9 Million

ROW to be Purchased (Central Section)• 79 Parcels• $16.9 Million

Illinois ROW Summary

ROW Purchased• 7 Parcels• $0.7 Million

ROW to be Purchased• 59 Parcels• $3.8 Million

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

Iowa Cost EstimatePhase 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

Iowa Cost EstimatePhase II – Central Section

Beyond 2017, $ in YOEMain 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

Illinois Cost EstimatePhase 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

Central Section Cost EstimateYOE

IOWA ILLINOIS

$494.6 M $665.6 M

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

Anticipated Maintenance Cost (Iowa Share)

Option 1 – In service until 2025• Main Bridge $ 3.0

M• Approach Bridges $ 2.8

M• Total $ 5.8 MOption 2 – In service until 2035• Main Bridge $14.2

M• Approach Bridges $ 8.7

M• Total $22.9 M

Corridor Federal Funding

• Earmarks $74.6 Million• Unobligated Amount $ 7.2 Million

Questions?