M-231 (Michigan highway)

M-231
M-231 highlighted in red
Route information
Maintained by MDOT
Length	7.212 mi[1] (11.607 km)
Existed	October 30, 2015 (2015-10-30)[2]–present
History	Construction started in 2011[3]
Major junctions
South end	M-45 near Robinson
Major intersections	M-104 near Nunica
North end	I-96 near Nunica
Location
Country	United States
State	Michigan
Counties	Ottawa
Highway system
Michigan State Trunkline Highway System Interstate US State Byways
← M-227 → M-239

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.