M-231 (Michigan highway)
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M-231 highlighted in red
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| Route information | ||||
| Maintained by MDOT | ||||
| Length: | 7.212 mi (11.607 km) | |||
| Existed: | October 30, 2015 – present | |||
| History: | Construction started in 2011 | |||
| Major junctions | ||||
| South end: |
 M-45 near Robinson
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 M-104 near Nunica
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| North end: |
 I-96 near Nunica |
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| Location | ||||
| Counties: | Ottawa | |||
| Highway system | ||||
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M-231 is the designation of a state trunkline highway in the Lower Peninsula of the US state of Michigan that serves as a partial bypass to US Highway 31 (US 31) around Grand Haven. This highway was built south of Interstate 96 (I-96) as an additional crossing over the Grand River. The route runs from M-45 northward and across the river to a connection with I-96 near the current M-104 interchange.
The Michigan Department of Transportation (MDOT) announced the proposed highway in early November 2006. The new corridor was funded through a Congressional appropriation and a state employment program. The Grand River bridge construction was originally planned for 2010 while the land for the project was being acquired. Other smaller bridges were included in the original plans. Roadway construction was scheduled for 2012. Recent developments in MDOT schedules had construction starting on the Grand River bridge after federal approval was secured with the remainder of the project deferred until additional funding is in place. The road opened on October 30, 2015, as a two-lane, limited-access expressway.
M-231 begins along M-45 (Lake Michigan Drive) in Robinson Township near the intersection with 120th Avenue. It runs due north through a mix of farm fields and forest lands in Ottawa County. The highway is a two-lane, limited-access highway. The trunkline crosses North Cedar Drive on an overpass, and then it crosses the Grand River into Crockery Township. As it crosses the river, M-231 angles northeasterly before intersecting M-104 the latter's eastern terminus at I-96, and M-231 continues north to its own northern terminus at a new partial interchange with I-96.
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