• Road Jurisdictions 1

Road Jurisdictions

State Highways

State Highways, including Highways 1, 12, 37, 101, 116, 121, and 128 are part of an interconnected state highway system, built and maintained by the California Department of Transportation (Caltrans). The Sonoma County Department of Transportation and Public Works has no jurisdiction over the California State Highway System.

County Roads

The County, or Unincorporated, Road System makes up the majority of roads within Sonoma County. This includes most roads that are (a) publically-owned, (b) publically-accessible, (c) outside of city limits, and (d) not part of the State Highway System. These are owned and maintained by the Sonoma County Department of Transportation and Public Works.

City Streets

Public roads belong to the city if they are within city limits and not part of the State Highway System. The Sonoma County Department of Transportation and Public Works has NO jurisdiction over city streets.

Private & Other Streets

Some roads may be privately-owned or administered by other agencies. Roads often fall under this category if they are inside any of the following areas: public parks, gated and/or private communities, farms, ranches, wineries, military installations, schools and/or universities.

Contact Information

Business Hours
Monday – Friday
8:00 AM – 5:00 PM

By Appointment Only.  Responding 24x7 to Emergencies.

Contact us by Phone
Office Location
La Plaza B
2300 County Center Drive
Suite B 100
Santa Rosa, CA 95403
38.462023, -122.725381

Road Agencies

City Public Works

Contact one of the following for road issues within city limits.

Cloverdale

City of Cotati

Healdsburg

Rohnert Park

Petaluma

Santa Rosa

Sebastopol

Sonoma (City of)

Windsor

State and US Highways

State Highways 1, 12, 37, 116, 121, 128, and US Highway 101.

Caltrans Home
California Department of Transportation (Caltrans).

Caltrans QuickMap
Real-time California map of current traffic conditions