SR37 Corridor Projects

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What's New

  • Planning and Environmental Linkages (PEL) Study (Ultimate Solution for US 101 to I-80 Corridor) Update (01/06/2022): A virtual public meeting will be held on January 25, 2022 at 5:30 p.m. to provide an update on the development of the PEL Study, answer questions, and receive public input on alignments to be evaluated in the study.  For more details, visit the SR37 Project Meetings & Events page.
  • Sears Point to Mare Island Improvement Project Update (1/13/2022): The Draft Environmental Document for this traffic operations improvement project is available for public review January 13 – February 28, 2022.  To learn more, view the project fact sheet.  A virtual public meeting will be held on February 2, 2022 at 5:30 p.m. to take public comments on the environmental document. For more details, visit the SR37 Project Meetings & Events page. 

The future of the State Route 37 Corridor requires finding solutions to 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 is working with its partner agencies, The Metropolitan Transportation Commission and the four North Bay County Transportation Agencies to develop a more resilient corridor.

But We Need Your Help!

Please provide us with your thoughts and suggestions on planning a more resilient, reliable, and safer facility for all travelers.

Please fill out the questionnaire at the link below, or use the QR code with your mobile device to go directly to the survey:  

Survey Monkey Questionnaire (

Qr Code

You can also use the interactive map below to leave your comments directly on the map (click on the image)


Clickable Map of Route 37


SR 37 is an important regional connection linking the north, east and west SF Bay Region following along the northern shore of San Pablo Bay.  This 21-mile long roadway from US 101 to I-80 connects job markets and housing within Marin, Sonoma, Napa and Solano counties.

Map of SR 37 linking the north, east and west SF Bay Region along the northern shore of San Pablo Bay