M-157 (Michigan highway)
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| Roscommon Road | ||||
M-157 highlighted in red
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| Route information | ||||
| Maintained by MDOT | ||||
| Length: | 1.193 mi (1.920 km) | |||
| Existed: | 1932 – present | |||
| Major junctions | ||||
| South end: |
 M-55 near Prudenville
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| North end: |
 M-18 near Prudenville |
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| Location | ||||
| Counties: | Roscommon | |||
| Highway system | ||||
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M-157 is a short state trunkline highway in the US state of Michigan. The highway is entirely within Roscommon County in the Lower Peninsula. It is the fourth-shortest state highway in the system, and it serves as a connector route between M-18 and M-55 just east of Prudenville. The current roadway was built and designated as M-157 in the 1930s.
M-157 begins at an intersection with M-55 east of Prudenville and Houghton Lake. The trunkline angles to the northwest before turning north near Ryan Lake. Serving as a short connector, the highway travels north through the Roscommon State Forest terminating just over a mile later at a junction with M-18. M-157 has not been listed on the National Highway System, a system of highways important to the nation's economy, defense, and mobility. The average annual daily traffic (AADT) in 2008 was 496 vehicles per day.
M-157 was originally designated in 1931 as a connector route between M-55 and US 27 (present-day M-18). Just a year later, that version was decommissioned, and the road obliterated. A new alignment, the present-day routing of M-157, was then commissioned just to the east.
The entire highway is in Backus Township, Roscommon County.
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