Public WorksRoads



Welcome to the Napa County Roads Division. We are committed to maintaining and preserving the Napa County road system so that it is safe, reliable and accessible for all users.
The Roads division is responsible for maintaining approximately 450 miles of public roads, 79 bridges and 50 major drainage structures within the unincorporated area of the County. The division is active in other road-related safety efforts such as vegetation management and maintenance of structure, drainage facilities, guardrails, traffic signs, signals and pavement markings.
We invite you to visit our links page for useful road and safety links.


Oakville Crossroad Bridge Replacement Project

The Oakville Crossroad Bridge, over the Napa River between Highway 29 and Silverado Trail, reopened Thursday, January 21, 2016.

The bridge was closed May 22, 2015, as a result of damage from a 4.1-magnitude earthquake. At that time, the base that held up the west end of the bridge sank 4 inches, pulling apart existing cracks on the then-nearly 100-year-old bridge, and exposing structural steel. It was closed to vehicles, bicycles and foot traffic.

The bridge was demolished, and a new one stands in its place. The project cost is about $7 million, which was primarily funded by the Federal Highway Administration.


Below are photos (1) Supervisor Diane Dillon, Congressman Mike Thompson, Supervisor Brad Wagenknecht and Supervisor Alfredo Pedroza cut the ribbon to open the new bridge; and (2) a closeup view of the specialized timber treatment used for the bridge rails.



Greenwood Avenue Culvert Replacement Project

Napa County Public Works is happy to announce that Greenwood Avenue is now open to the public. Please be aware that there will continue to be some minor work in the area after the reopening of the road, please drive carefully and be aware of construction workers on or around the new bridge construction. Thank you for your patience and cooperation with the Department this past year towards the successful completion of the new Greenwood Avenue Bridge.


Below are photos (1) the finished new bridge; and (2) local resident Tom Peltier cuts the ribbon opening the new bridge.




Partnering for Safety


The County has partnered with Cal Fire and various fire safe councils to remove and reduce the fire fuel load along our roadways.  County crews provide traffic control, equipment and some tools.  Cal Fire supplies an inmate crew with tools, and the Fire Safe Councils handle public outreach, coordination with landowners and identifying priority areas.


Removing and reducing vegetation along roadsides improves both fire safety and traffic safety, and is the biggest part of the Roads budget.  This partnership helps get much more work done for much less cost.


Videographer/drone operator Evan Kilkus filmed this partnership work in progress along Lake Berryessa Road in March, 2015, and has made this video footage available to the County.  The music has been provided courtesy of local musician Bill Scholer.


Traffic Mitigation Fees

All new development, or improvements to existing development that will generate additional traffic, in the Airport Industrial Area are subject to a Traffic Mitigation Fee


Road and Bridge Projects 2015-2018