Highway 29 – American Canyon Improvements

This project aims to improve safety and operations, support transit, and increase multimodal options for pedestrians and cyclists along the State Route (SR) 29 corridor in American Canyon. In February 2023, the Napa Valley Transportation Authority (NVTA) selected two build alternatives and a no-build alternative for detailed evaluation in the project approval and environmental document (PA/ED) phase. NVTA initiated the PA/ED phase in April 2024 to further analyze these alternatives and ultimately select a preferred alternative to proceed with detailed design.

Under both build alternatives, the corridor would be reconfigured with multimodal enhancements: narrowed general purpose lanes, improved transit operations, and enhanced bicycle and pedestrian facilities. Build Alternative 1 would implement these features on the existing signalized corridor. Build Alternative 2 incorporates roundabouts at intersections with crossing treatments for pedestrians and cyclists. In Winter 2026, the American Canyon City Council and the NVTA Board of Directors expressed support for Alternative 1. Environmental clearance and Caltrans project approval for Alternative 1 is targeted by the end of 2026.

Cost: Pre-construction – $20 million, Construction – $55 million

Status:

• Traffic forecast model approved and traffic analysis work underway

Schedule (pending funding)

• 2023 – PID approval (complete)
• 2024-26 – Environmental
• 2027-28 – Design
• 2027-28 – Right-of-way
• 2029 – Construction (funding dependent)

Update – February 2026

Following a corridor intersection analysis completed by Kimley-Horn, the NVTA Board of Directors and American Canyon City Council supported signalization coupled with multimodal improvements at six major intersections as the preferred alternative in February 2026.

Update – Spring 2025 

Read a detailed summary of the April 30 Community Workshop on the SR29 – American Canyon Improvements, including community feedback, project details and photos. See the materials and boards presented during the workshop. 

NVTA plans first community meeting on SR29 – American Canyon Improvements 

When: Wednesday, April 30, 2025 — 5:30 to 7 p.m. 

Where: American Canyon City Hall Annex, 4381 Broadway St., suite 201, American Canyon

Feb 4, 2025: NVTA presentation at the American Canyon City Council. (Watch the video here!)

In April 2022, the Napa Valley Transportation Authority, the City of American Canyon, and Caltrans held a virtual presentation of the two proposed alternatives for the improvements to State Route (SR) 29 through American Canyon. This presentation was open to the public, and anyone was welcome to attend. This project included a brief presentation by the project team. The presentation summarized the overall project, discussed the two selected alternatives, and provided an overview of the next steps for the PA/ED Phase. Following the presentation, attendees were invited to ask questions and share comments with NVTA, the City of American Canyon, Caltrans, and project team representatives.

On October 4, 2021, the Napa Valley Transportation Authority and the City of American Canyon held a public meeting for the Highway 29 American Canyon Multimodal Improvement Project. To watch the meeting, go to youtu.be/5VhiHyCKAKA.

Thanks to all who commented on the project! Your feedback makes these public projects better. Public commenting is now closed. You will have another opportunity to comment on this project during the environmental site assessment phase.

Project Social Pinpoint. NVTA thanks you for your continued support with this very important project.

Support
NVTA is working with Caltrans and American Canyon on multimodal and operational improvements to Highway 29 between Napa Junction and American Canyon Road. The Project Initiation Document (PID) builds off the prior study completed as part of the Highway 29 Comprehensive Multimodal Corridor Plan (CMCP), which was released in 2020.

The project purpose:

• Improve mobility for all users
• Improve safety for all users through Vision Zero
• Eliminate overhead utility poles
• Improve corridor aesthetics
• Reduce vehicle miles traveled (VMT) by encouraging transportation mode shift
• Improve access to businesses along SR 29
• Improve accessibility for all modes of transportation

The project need:

Regionally, SR 29 provides direct connection between Solano, Napa and Sonoma counties in the North Bay. Locally, SR 29 is also the lifeblood of access into and out of Napa County. Vehicle volumes on SR 29 are comparable to other nearby state highways SR 12 and SR 37. However, because the SR 29 corridor functions as American Canyon’s “Main Street,” it experience significant safety, aesthetic, and operations issues between Napa Junction and American Canyon Road. Some of the most pronounced issues of the corridor include:

• Lack of multimodal connectivity – particularly for bicycle and pedestrian access – along and across SR 29
• Lack of low-stress routing options for bicyclists and pedestrians along SR 29
• Lack of public transit lanes, facilities and pullouts for stops
• Lack of aesthetic benefits like landscaping to help define American Canyon’s Main Street
• Regional traffic congestion which hinders access to American Canyon’s commercial business
• Constraints at intersections that cause extensive queueing, bottlenecks and delays