State Route 37 | Metropolitan Transportation Commission
Monday, December 1, 2025
Update
State Route 37
MTC and its partners are working to make state Route 37 more resilient against chronic traffic congestion, flooding and sea level rise, in order to preserve vital connections between jobs and homes.
Remote video URL
State Route 37 (SR 37)
runs along the northern shore of San Pablo Bay, linking US 101 in Novato with Interstate 80 in Vallejo. This 21-mile corridor connects Solano County cities and some of the most affordable housing in the Bay Area with jobs in Napa, Marin and Sonoma counties. It also serves as a vital connection between Marin, Sonoma, Solano and Contra Costa and the Central Valley.
The low-lying corridor experiences a number of challenges, including chronic traffic congestion, vulnerability to flooding that will increase with sea level rise, and potential impacts on highly sensitive wetlands.
Making SR 37 More Resilient
MTC and its partners are working on the development of corridor improvements to make this critical regional transportation corridor higher, safer, greener and built to last.
Near-term flood reductions include:
Raised pavement elevation
Flood walls, drainage, culverts and slide gates
Bladders and portable pumps
Interim solutions to:
Improve traffic flow and peak travel times
Provide equitable transportation for underserved communities
Include a high-occupancy vehicle (HOV) lane and encourage public transit
Ultimate improvements will:
Adapt SR 37 to sea level rise
Create ecological resilience in the surrounding environment
Enhance public access
Provide safe mobility for bicycles and pedestrians
Sonoma County Transportation Authority
See what MTC and its partners are planning for SR 37. Participate in meetings and events to share your views.
Learn more at scta.ca.gov.
Caltrans Corridor Projects
Caltrans’ SR 37 project maps, background, meetings and more.
Learn more at dot.ca.gov.
Partnership
The Resilient SR-37 Partnership agencies include:
MTC
The California Department of Transportation
The Transportation Authority of Marin
Napa Valley Transportation Authority
Solano Transportation Authority
Sonoma County Transportation Authority
Sonoma Marin Area Rail Transit District (SMART)
The Partnership agencies work closely with colleagues from:
U.S. Army Corps of Engineers
U.S. Fish and Wildlife Service
U.S. Environmental Protection Agency
National Oceanic and Atmospheric Administration
California Natural Resource Agency
California Department of Fish and Wildlife
San Francisco Bay Regional Water Quality Board
San Francisco Bay Conservation and Development Commission
Federated Indians of Graton Rancheria
Yocha Dehe Wintun Nation
Past Public Meetings
July 10, 2025 Meeting
SR 37 Policy Committee Hybrid Public Meeting
View the 7/10/25 meeting agenda packet
View the 7/10/25 video recording
March 5, 2025 Meeting
Sonoma County Transportation Authority hosted a State Route 37 Policy Committee Hybrid Public Meeting
View the 3/5/25 meeting packet and presentation
View the 3/5/25 video recording
January 14, 2025 Meeting
Caltrans hosted a Draft Supplemental Environmental Impact Report (SEIR) Hybrid Public Meeting
View the 1/14/25 presentation
April 24, 2023 Meeting
The latest project updates were presented
View the 4/24/23 video and meeting materials
September 14, 2022 Meeting
Caltrans shared the results of its evaluation of alternatives for the future of Highway 37
Watch the 9/14/22 video
February 2, 2022 Meeting
SR 37 Sears Point to Mare Island Improvement Project
Watch the 2/2/22 video
Related Documents
SR 37 Agency Partnership
433.96 KB
pdf
Digital Library
Propsed Toll on Highway 37
The Resilient 37 Program partners are proposing a toll on State Route 37 to help meet regional transportation and environmental goals.
Learn more about the proposed toll.