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Construction Standards


Utility Companies: See Guidelines for Utility Cuts on County Roads




Mail & Newspaper Boxes


Street Lights

Traffic Signing


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

Roadway Utility Cuts

See guidelines for roadway utility cuts

Trench Cut 3

See guidelines and restrictions for making utility cuts on Sonoma County roads.

Information Resources

Road-Related Information and Downloadable Resources

Construction Standards
View and download standard plans for new construction on County roads.

Traffic Surveys
See traffic counts and speed surveys taken on Sonoma County roads.

Download the Postmile Book, a detailed listing of significant locations along County roads.

Road Jurisdictions
State, county, city or private? Find out which agencies are responsible for which roads.

Measure M

Measure M Projects


See listing of current and completed projects funded by Measure M.