Kewaunee CTH S over Ahnapee River Bridge Replacement

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The Kewaunee County Highway Department retained Ayres to design the replacement of the CTH S bridge over the Ahnapee River in Algoma.

The design was for the replacement of a single-span steel through girder bridge, which was approximately 105 feet long with a clear roadway width of 26 feet. The bridge was a fracture-critical structure, meaning that if one of the two girders supporting the bridge were to fail, part or all of the bridge probably would collapse. It had a sufficiency rating of 25.1 out of 100 and was constructed in 1949.

The new structure is a two-span concrete haunched slab bridge with a clear roadway width of 32 feet. 

Ayres’ services included topographic survey, environmental assessment, Wisconsin Department of Transportation reports, utility coordination, storm sewer design, public involvement, right-of-way plat, preliminary and final bridge and roadway design, specifications, and quantities.

Project Information

Client's Name

Kewaunee County Highway Department


Kewaunee County, WI

Primary Service

Roadway Design

Client Type

Local Government