I-75 lane closures for M-123 bridge repairs start June 1 in Mackinac County

ST. IGNACE, Mich. ­- The Michigan Department of Transportation (MDOT) is investing about $400,000 in bridge improvements on the M-123 bridge over I-75 . The project will include temporary supports and substructure patching.

County:
Mackinac

Highways:
I-75
M-123

Closest community:
St. Ignace

Tentative start date:
Monday, June 1, 2026

Estimated end date:
Tuesday, Aug. 11, 2026

Traffic restrictions:
Motorists should expect single-lane closures in each direction of I-75 under the bridge. A 12-foot width restriction will be in place during the project.

Jobs numbers:
Based on economic modeling, this investment is expected to directly and indirectly support three jobs.

Safety benefit:
This work will extend the lifespan of the structure and increase safety for motorists.