| M-15 | ||||
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M-15 highlighted in red
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| Route information | ||||
| Maintained by MDOT | ||||
| Length: | 73.664 mi (118.551 km) | |||
| Existed: | c. 1927 – present | |||
| Tourist routes: |
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| Major junctions | ||||
| South end: |
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| North end: |
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| Location | ||||
| Counties: | Oakland, Genesee, Tuscola, Saginaw, Bay | |||
| Highway system | ||||
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I-75 at Clarkston
I-69 near Davison
M-57 near Otisville
M-15 is a north–south state trunkline highway in the US state of Michigan. The southern terminus is a junction with US Highway 24 (US 24) just south of Clarkston on the northwestern edge of the Detroit metropolitan area. The trunkline is a recreational route running north and northwest to the Tri-Cities area. The northern terminus is the junction with M-25 on the east side of Bay City. The total length is about 73 2⁄3 miles (118.6 km) between the two regions.