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I-90 bridge near Dresbach

I-90 bridge near Dresbach/Photo by Alissa Haupt
I-90 bridge near Dresbach/Photo by Alissa Haupt

Issues: The bridge has rust and cracks in some of its steel elements and minor movement and cracking in some concrete elements. There is also some corrosion on the underside of the bridge. The bridge’s shoulder does not allow emergency or maintenance vehicles to pass without a lane closure. It is nearing the end of its life expectancy.

Fracture critical? Yes

Structurally deficient? No

Sufficiency rating:  77

Deck rating: 5

Superstructure rating: 6

Substructure rating: 6

Length: 2,490 feet

Width: 67 feet

Average daily traffic: 25,000 vehicles

Passes over: Mississippi River into LaCrosse, Wisconsin

Constructed in: 1967

Construction starts in: 2012

Construction should finish: 2015

$120 million to $200 million for Minnesota. Wisconsin will pay the other half.

Detour: There will be no detour. The new bridge will be built upstream so traffic can be maintained on the existing structure during construction.

New bridge: The new bridge will be a concrete box girder, similar to the new I-35W bridge. The view the new bridge’s design, go here.

Source: Minnesota Department of Transportation

Alleen Brown is a senior journalism and global studies student at the University of Minnesota.

MAIN STORY: State bridge inspectors: Keeping 19,000 bridges safe is a challenge

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