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.

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:


Take a Survey / Fill out the Questionnaire

Thank you for taking the time to provide your input. The survey is now closed and a summary of the results is forthcoming.

Please stay tuned for more opportunities to be engaged.


Call the Highway 37 Public Information Line
(510) 286-1204

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:

Three coordinated efforts are underway to formulate these solutions:

  • An Ultimate Resilient Design Alternatives Assessment focused on Highway 37 within Marin and Sonoma counties between U.S. 101 and Highway 121.
  • A Comprehensive Multimodal Corridor Plan collaboratively identifies goals, corridor needs and challenges, and project priorities for various modes of travel to inform decision-making and future funding.
  • A corridor-wide effort known as the Planning and Environmental Linkage study will identify and narrow the range of alternatives to be advanced for environmental review and construction.

Each of these efforts need your input! Take this Survey to provide us with your input!  These studies are integrated to deliver a roadway that will serve both long-term transportation needs and the environment

Short-Term Actions Underway:


SR37 Projects | Caltrans

How High Should the Future Highway 37 Be?

The level of the San Francisco Bay could rise five to seven feet by 2100 under high greenhouse gas emission scenarios, according to 2018 projections by the California Ocean Protection Council. With high tides during a large storm, this translates into the need to raise Highway 37 by at least 20 feet.

Project Study Areas

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

Learn More: Frequently Asked Questions

What is the Vision for Highway 37?

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. Be sure to take the Survey to provide us with your input!

How Will My Input Be Used?

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.

A Collaborative Team of Agencies

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

When Can We Expect These Improvements?

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.

Who Can Participate in the Planning Process?

Everyone is encouraged to participate.

Learn More About the Various Planning

Efforts with these Fact Sheets