Caltrans District 4 Napa County Newsletter

State Route 121 Five Way Intersection Improvements Project

Napa County is the only county in the Bay Area that is not served by an Interstate highway. But the locals will tell you of the importance of State Route 29 (SR-29) which begins in Solano County in Vallejo and the stretch that leads to Napa is known as Broadway St.

Once inside Napa County, SR-29 extends up to St. Helena and Calistoga. Besides SR-29, existing roadways such as State Route 121 (SR-121) need to adapt to change. One such location considering a major improvement is the Five-Way Intersections Project in the City of Napa on SR-121 at the existing intersection with Third Street, Coombsville Road, and East Avenue.

This complex intersection has been problematic for many years. Safety improvements are needed to reduce traffic accidents through the SR-121 corridor which is ranked among the highest injury corridors within the City of Napa per the City’s Local Roadways Safety Plan (adopted September 6, 2022).

This project has been proposed to reduce driver delays, alleviate congestion, and improve traffic flow. Safety always comes first at Caltrans and that is the primary goal of the project. The secondary objectives of the project are to improve bicycle and pedestrian facilities at the intersection as well as meet Americans with Disabilities Act (ADA) requirements.

A public meeting was held on September 17 at Alta Heights Elementary School in Napa. Caltrans engineers Amani Meligy and Anthony Cabangangan were there as well as Caltrans Environmental Planner Shawn Hallum.

State Route 29 Roadway Improvements

Caltrans is continuing work for a maintenance project that replaces existing asphalt from the north end of the Napa River (Butler) Bridge to Sierra Avenue. This project also includes upgrading guardrail systems, drainage system replacements, and rehabilitation of existing curb ramps at Imola Avenue on/off ramps. Additional paving work is ongoing during nighttime hours.

The project is expected to be completed by the Spring of 2026.

State Route 29 Drainage System Replacement and Safety Fencing

A culvert is a tunnel carrying a stream open drain under a road or railroad. On SR-29, there are many culverts that help to direct runoff away from hills and creeks.

SR-29 crews are at work replacing an existing 42’’ high-density polyethylene (HDPE) pipe with reinforced concrete pipe (RCP) drainage system conveying ground and storm water from a pump house just south of the Trancas Street/Redwood Road overcrossing to the Napa Creek. RCP is a better material than HDPE which needed to be replaced due to cracking and sinking in the roadway and shoulder of the northbound on-ramp at Lincoln Avenue.

Right now, 60 percent of the work has been completed. To facilitate the construction, the right lane in the northbound direction of SR-29 and the on-ramp from Lincoln Avenue and the off-ramp to Trancas Street are closed Monday through Friday between 9 A.M. and 2:30 P.M. The estimated completion date is December of 2026.

In addition, new fencing is being constructed between Trancas Street and the pedestrian overcrossing to keep pedestrians from walking onto SR-29 for their safety. The fencing should be completed in a few months.

State Route 29 Emergency Culvert Replacement

On SR-29 between Rutherford and Oakville near Glos Lane, a sinkhole has developed and soon, construction will begin to replace the culvert.  Currently, a traffic shift is in place. Traffic cones are aligned on both sides of that stretch of SR-29 and the roadway is open in both directions.

Once construction begins to replace the culvert, traffic will be shifted into one lane for use by both directions under one-way reverse traffic control. When the project begins it will take three to four weeks to complete.

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: https://x.com/511SFBay
For real-time information, visit Caltrans QuickMap: https://quickmap.dot.ca.gov
Follow us on X: https://x.com/CaltransD4
Or call 1-800-472-7623, 1-800-427-ROAD for state highway conditions statewide.

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