Caltrans District 4 Napa County Newsletter
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Welcome to the June edition of the Napa County Caltrans E-Newsletter!
Caltrans wants residents and visitors to Napa County to be informed of changes and improvements to the roadways in the county which make it arguably the best place to live, work, and play in the Bay Area.
Besides the wineries and the scenic views which make it an exciting destination for travelers, there were some other events happening in recent months.
On Memorial Day weekend, Napa County hosted the annual BottleRock music festival which brought an estimated 120,000 visitors to Napa. With such a large attendance, the roadways leading to Napa Valley have seen an increase in traffic hence the need for expanding and improving the existing roads.
State Route 29 Roadway Improvements in American Canyon
The City of American Canyon has seen exponential growth over the past two decades and there has been increased volume of motor vehicles on State Route 29.
On April 30, Caltrans, Napa Valley Transportation Authority, and the city of American Canyon held a public meeting seeking feedback from the public. The goals are to improve safety, maximizing efficiency, and preserving the natural environment.
Regionally, State Route (SR) 29 provides a direct connection between counties along Interstate 80 (1-80) and 1-580 and counties along US 101 in the North Bay. Locally, SR 29 is also the lifeblood of access into and out of Napa County.
SR-29 Corridor functions as American Canyon’s “Main Street.” As such there are significant operational deficiencies between American Canyon Road and Napa Junction Road weekday and weekend peak hour conditions. There is no ideal bicycle or pedestrian access along and across SR-29. Nor are there public transit lanes or pull outs for transit stops.
The regional traffic congestions cause delays for customers access to commercial businesses on “Main Street” most notably, Costco.
Proposed Alternatives are to have either signalized intersections or roundabouts which keep traffic moving without the need for stop signs or traffic signals. The project is in development stage with construction set to begin in 2026.
Napa County Maintenance Projects
SR-29 Drainage System replacement project
A culvert is a tunnel carrying a stream or open drain under a road or railroad. On State Route 29, the main highway that runs through Napa County, there are many culverts that help to direct rainwater away from hills and creeks.
Caltrans currently has a project on SR-29 to replace 42’’ of high-density polyethylene (HDPE) pipe with a 42’’ reinforced concrete (RCP) drainage system to convey ground and storm water from a pump house from the Trancas Street Redwood Road overcrossing to the Napa Creek.
This project will also repair sections of the existing roadway pavement along NB 29 between the onramp from Lincoln Avenue and the offramp to Trancas Street. This project is expected to be completed in December 2026.
Tunnel of Elms Tree Removal
An ongoing project, in St. Helena, is the replacement of the famed “Tunnel of Elms” trees that are alongside both directions of SR-29 by the Beringer Vineyards. The trees which were planted in the 1880’s have far exceeded their lifespan. The original trees are decaying due to age and Dutch Elm Disease. Eventually, all of the trees may need to be replaced by trees resistant to disease.
This Spring, we had a firsthand look at how these trees, while seemingly healthy, inside the trunk shows the danger of decay and why removal and replacement is necessary.


Setting the PACE: Public Affairs Customer Engagement Site is Now Live!
District 4 is proud to announce the launch of our new Customer Service Request (CSR) platform. PACE, the Public Affairs Customer Engagement site, provides a regularly updated breakdown of services requested and rendered across the district.
- The CSR dashboard aims to provide an overview of the responsiveness to maintenance services requested across the nine Bay Area counties.
- The data represented as month-to-date falls within a rolling 30-day Service Level Agreement (SLA) and is updated weekly.
- We strive to close 60% (or more) of all monthly service requests received via the CSR website portal.
- For more information or to leave comments/suggestions, please contact D4CSLTEAM@dot.ca.gov.
- To report a highway issue/problem, please submit a CSR ticket through the Customer Service Request Form.
The Napa County newsletter will be distributed on a regular schedule.
For 24/7 traffic updates, please visit 511.org or https://X.com/511SFBay
For real-time information, please visit Caltrans QuickMap: https://quickmap.dot.ca.gov
CONTACT:
Napa County Public Information Officer
Ryan Leong
North Bay Branch Chief
Vince Jacala
General Information
(510) 286-4444
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