M-25 (Michigan highway)

M-25 is a state trunkline highway in the US state of Michigan. The route follows an arc-like shape closely along the Lake Huron shore of the Thumb in the eastern Lower Peninsula between Port Huron and Bay City. It serves the lakeshore resorts along Lake Huron and Saginaw Bay and generally lies within sight of the lake and the bay. All is surface road and generally scenic, except for the freeway segment near the junction with I-75 and connection into the US 10 freeway.

Between Port Huron and Port Austin it is the north–south highway that used to be US 25 before the designation was removed from Michigan. Between Port Austin and Bay City it is an east–west route that appeared on some maps as US 25 and on some maps as a M-25. Since the 1970s, when all of US 25 was deleted north of Cincinnati, Ohio it is now entirely M-25.

Route description

North to Port Austin

The starting point of M-25 at a junction with Business Loop I-69/Business Loop I-94 (BL I-69/BL I-94) in Port Huron. M-25 is part of the Lake Huron Circle Tour for its entire length. From here M-25 heads north on Pine Grove Avenue until meeting M-136. At this intersection, M-25 turns north on 24th Avenue to Lakeshore Road then runs parallel to the Lake Huron shoreline.

In the community of Lakeport, M-25 passes through Lakeport State Park. Past the park, M-25 changes names from Lakeshore Road to...
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