Planning a More Resilient
Highway 37 for All

Think about Highway 37 as more than just a commute! The future of this corridor demands finding solutions to chronic traffic congestion and periodic flooding. But it will also require balancing transportation needs with protecting and enhancing sensitive marshland habitats. Planning a long-term solution presents an opportunity to provide bicycle, pedestrian, transit, and carpool options for all travelers.

Caltrans will begin work on Eastbound State Route 37 (SR-37). EB SR-37 will be closed, and motorist detoured beginning at the SR-37/SR-121 interchange near Sears point (Sonoma County). The Eastbound closure will be 55 hours, starting Friday, May 10 at 10:00 PM to Monday, May 13 by 5:00 AM.

During the 55-hour weekend full highway closures, Caltrans will perform major pavement repair work on EASTBOUND SR-37 between Solano and Sonoma counties. One traffic direction on SR-37 will be worked on at a time. Detours on eastbound SR-37 will be in effect. Westbound SR-37 will remain open at all times.

Please visit the Caltrans 37 Pave webpage for full details on timing, detours and more.

Get Involved

Get involved in planning Highway 37: resilient, reliable, safer, and built to last for all travelers!
To learn more about the planning processes and how to provide your valued input:

Provide a comment or sign up for email updates

StateRoute37@dot.ca.gov

Call the Highway 37 Public Information Line

(510) 286-1204

Join us on Social Media

SR37 on Facebook and Twitter

One Corridor, One Team, Many Solutions

While Caltrans, the Metropolitan Transportation Commission, and transportation authorities for Marin, Napa, Solano, and Sonoma counties are already implementing short-term improvements, other challenges require a suite of longer-term solutions

A Collaborative Team of Agencies
  • North Bay Area Counties (Marin, Sonoma, Napa, and Solano)
  • Caltrans
  • MTC
  • Regulatory Agencies

Project Study Areas

Click here for an interactive map to further explore the project study areas.

Learn More: Frequently Asked Questions

A long-term plan should last a generation or more. We need to anticipate changes in the landscape and the transportation needs of the region. Think of the people and the areas that Highway 37 serves, how the highway interacts with the built environment and wildlife, and how future residents will be using this area. That is where a vision starts.

The Highway 37 Team is seeking input from engaged stakeholders and members of the public to inform solutions and strategies. Your recommendations will be summarized and forwarded to transportation planners and highway designers.

A highway has many elements—alignment route, travel lanes, connection points, bridges, and waterway passages—with options for bicyclists, pedestrians, and transit. Highway 37 is affected by the surrounding landscape, including agricultural lands, natural habitat, and the built environment. What elements do you see as part of the solution and what considerations should be evaluated or protected? It’s One Corridor – many solutions! Your ideas will help shape these potential solutions, the evaluation, and the final project.

Our team is taking a phased approach; addressing the most immediate challenges now, while we seek your input on longer-term solutions. Work has already begun on some of the shorter-term solutions, including raising the roadway and installing floodwalls in areas most vulnerable to flooding. Another short-term project is reducing congestion through the addition of a high occupancy vehicle (HOV) lane between Highway 121 and Mare Island.

Medium- and long-term solutions will require more study and evaluation by engineers, regulators, and the public. The roadmap below outlines the primary planning phases and key milestones all the way through construction. As you can see, there will be lots of opportunities for public input throughout the process.

Everyone is encouraged to participate.