According to the Michigan Department of Transportation (MDOT), their maintenance personnel "routinely inspect state trunklines," monitoring them for many conditions, including the development of potholes.
If you notice a pothole forming on an "M," "US," or "I" route, you can report it any of three ways:
1. Access the MDOT website at www.michigan.gov/mdot, then click on the 'Report A Pothole' graphic on the right side of the page, to display the online form. Or...
2. Call the Pothole Hotline at 1 (888) 296-4546. Or..
3. Contact your local Transportation Service Center (TSC) or MDOT region office.
To report potholes and other problems related to local roads, contact your local city or county road commission.
To go directly to the onlin form, click here.
More about potholes.