Most public-road mileage is owned by local governments, while states own most Interstate and National Highway System mileage. The responsible public works or transportation agency depends on the exact road segment and any maintenance agreements.
The road's owner—not the route number, road class, or funding source alone—usually determines which agency maintains it.
Each institution has a different verb. Writing a rule, funding it, applying it, administering a service, and reviewing a dispute are not the same power.
Has the baseline ownership responsibility for maintaining and keeping the facility safe, subject to law and agreements.
Maintains locally owned streets, roads, signs, drainage, or bridges within assigned scope.
Maintains state-owned highways and most Interstate or National Highway System mileage.
Authorize programs and appropriate or adopt funding for maintenance and capital work.
Administers federal-aid programs, standards, data, and oversight for eligible facilities.
Ownership, maintenance, signals, sidewalks, drainage, bridges, and snow removal can belong to different agencies or be reassigned by agreement. Exact segment data beats road naming conventions.
