• 500x250_PlansHardhat

Construction Standards

The construction standards and notes listed below were approved by the director of Transportation & Public Works and adopted on July 9th 2020 by the County of Sonoma Board of Supervisors per County Ordinance 38-2020-0446 ‘Adoption of an Ordinance to Amend References to Applicable Design and 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
    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.