M-231 near Nunica, Ottawa County

Start: Spring 2011     End: Spring 2016

What Is Being Done?

M-231 project in Ottawa CountyThe Michigan Department of Transportation (MDOT) is constructing M-231, a new two-lane, limited access roadway from M-45 (Lake Michigan Drive) north to the I-96/M-104/112th Avenue interchange near Nunica in Ottawa County. It will be located west of the existing 120th Avenue roadway.

In addition, a new bridge will be constructed over the Grand River along this new route, making it only the fourth river crossing in Ottawa County. Work includes M-104 improvements near the M-231 intersection, a new I-96 interchange at M-231, and adding a westbound on ramp and eastbound off ramp to the I-96/112th Avenue interchange.

General Update

M-231 is estimated to open to traffic by the end of this October. Run or volunteer at the M 23.1 K Run set for October 3.

  • Work continues on bridge barrier wall, railing and pedestrian fencing
  • The contractor access roads need to be removed
  • Detention pond restoration
  • Permanent pavement markings
Update on M-231, from M-45 to Little Robinson Creek:
  • Work on M-45 is complete with the exception of the installation and activation of the traffic signals at M-231 and 120th Avenue. 
  • Work on M-231 from M-45 north to the Grand River is complete with the exception of pavement markings, signing and rumble strips.
Update on M-231, from the Grand River to M-104:
  • The Leonard Street bridge is complete, with the exception of painting.
  • Roadway paving is partially complete with leveling-course asphalt needed from Cypress Street to M-104. Final paving, shoulder gravel, etc., will be completed over the next two months.
  • Traffic signals at M-104 will be installed in the fall just prior to opening.
Additional Information:

US-31 Bypass Public Meeting Presentation pdf

News Releases:
Delivering value: M-231 bridge and Plainfield Avenue projects recognized nationally
Work progress on the new M-231 route in Ottawa County



Contact Us:

MuskegonTransportation Service Center, 231-777-3451
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