| M-13 | ||||
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M-13 highlighted in red
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| Route information | ||||
| Maintained by MDOT | ||||
| Length: | 73.339 mi (118.028 km) | |||
| Existed: | c. 1932 – present | |||
| Tourist routes: |
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| Major junctions | ||||
| South end: |
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| North end: |
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| Location | ||||
| Counties: | Shiawassee, Genesee, Saginaw. Bay, Arenac | |||
| Highway system | ||||
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Connector M-13 |
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| Location: | Kawkawlin |
| Length: | 2.414 mi (3.885 km) |
| Existed: | 1967–present |
M-57 near Chesaning
I-75 near Saginaw
M-13 is a 73.339-mile (118.028 km) north–south state trunkline highway that runs through the Saginaw Bay region of the US state of Michigan. It runs from Interstate 69 (I-69) south of Lennon to US Highway 23 (US 23) near Standish. The southern section of the trunkline runs along a pair of county lines in a rural area dominated by farm fields. The highway directly connects the downtown areas of both Saginaw and Bay City. North of the latter city, the Lake Huron Circle Tour follows M-13 along the Saginaw Bay.