Northbound I-75 lane closure at M-123 overpass begins Oct. 9 in Mackinac County

NEWBERRY, Mich. - The Michigan Department of Transportation (MDOT) is investing about $500,000 to perform substructure repairs on the M-123 overpass at I-75 in Mackinac County. This is additional pier repair work to a rebuilding project completed last year.

County:
Mackinac

Highways:
M-123
I-75

Closest community:
St. Ignace

Start date:
Thursday, Oct. 9, 2025

Estimated end date:
Friday, Nov. 14, 2025

Traffic restrictions:
Drivers should expect the right lane of northbound I-75 to be closed at the overpass via a concrete barrier wall. A 12-foot lane width restriction will be in place with a posted speed limit of 60 mph; 45 mph where workers are present.

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

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