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Cheboygan Bascule Bridge Rehabilitation

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Built in 1940, the Cheboygan Bascule Bridge, also known as the State Street Bridge, is a double-leaf bascule bridge in Cheboygan, Michigan, carrying U.S. Highway 23 (State Street) across the Cheboygan River. This bridge is listed on the National Register of Historic Places.

M&M was contracted to perform engineering services for the electrical, mechanical and structural rehabilitation of the double leaf bascule bridge and its approaches. We prepared preliminary and final structural plans, as well as mechanical and electrical plans to rehabilitate the aging structure.

All design work focused on the need to maintain public access and usage across the structure, as well as to maintain the ability of the span to open for marine navigation. A specialty of our design team was the critical coordination between owner, public, and USCG required on movable bridge projects. Early coordination with the USCG helped to keep the project moving and keep the Contract Documents as accurate as possible.

To limit vehicular and marine impact, specific sequence and planning details were depicted in the Contract Documents.

Bridge Geometry
Main Span Length 70 feet
Total Project Length 155 feet
Lanes on Structure 2 lanes and 2 pedestrian sidewalks