Who Maintains the Roads in Michigan's Thumb?
When a road in the Thumb is rough, under construction, or closed, the first practical question is: whose road is it? Michigan divides road responsibility in a way that is logical once you see it, and knowing the division tells you where to look for project information and where to direct a complaint.
The three layers
State trunklines. Any route with an I-, US-, or M- prefix — I-69, M-25 around the shoreline, M-53 up the center of the Thumb, M-46, M-24, and so on — is a state trunkline, maintained under the Michigan Department of Transportation. MDOT manages these through regional offices; the Thumb falls under the MDOT Bay Region, whose page lists the counties it covers and current projects. Note that the state's own transportation regions do not match the seven-county economic development region exactly — Genesee County, for instance, is handled separately — which is a common source of confusion.
County roads. Everything outside cities and villages that is not a trunkline belongs to a county road commission. Each of the seven counties in the region has one. Gravel roads, paved rural connectors, and most of the mileage you actually drive between towns are county roads. Road commissions also typically handle winter plowing on state trunklines within their county under contract with MDOT — so the plow truck on M-53 may well be a county truck.
City and village streets. Inside an incorporated city or village, local streets are the municipality's responsibility, though a trunkline running through downtown (M-25 through a shoreline town, for example) remains state-managed.
How projects get chosen
Road projects are not random. For state trunklines, MDOT programs work years ahead based on pavement condition data, traffic volumes, and available funding, with the Bay Region office as the public point of contact for the Thumb's state routes. Routes on the National Highway System — I-69 chief among them here — carry particular weight in federal funding decisions, since the Federal Highway Administration's NHS program ties federal planning attention to the roads that matter most for national travel and freight.
At the regional level, councils of governments help coordinate transportation planning with broader development goals; the East Michigan Council of Governments plays that role for much of east-central Michigan. Local road commission projects are set by each commission, typically with public meetings.
Practical takeaways
- For construction and closures on I-69 or any M-route in the Thumb, start with MDOT's Bay Region page.
- For a rural road outside town, contact that county's road commission.
- For a street inside a city or village, contact the municipality.
- If you want to influence what gets fixed, the venue matters: MDOT's public comment processes for trunklines, road commission meetings for county roads, and council meetings for city streets.
Understanding who owns which road turns a frustrating pothole into, at minimum, a well-aimed phone call.