Planning and Environmental Linkages (PEL)
The Future of State Route 37: Problems + Solutions
The future of the State Route (SR) 37 corridor demands finding solutions to chronic traffic congestion and periodic flooding. It also requires 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 conducting a comprehensive, long-range Planning and Environmental Linkages (PEL) Study to identify the best solutions to address the diverse needs of this complex corridor.
December 2024: PEL Addendum
Caltrans is has prepared an addendum to the PEL Study to prioritize segments for future environmental review, design, construction, and implementation.
State Route 37 PEL Study – 2024 Addendum
View the stakeholder presentation slides: Presentation (PDF)
December 2022: PEL Study Available!
Caltrans completed a comprehensive, long-range Planning and Environmental Linkages (PEL) Study in December 2022 to identify the best solutions to address the diverse needs of this complex corridor.
State Route 37 PEL Study – December 2022
State Route 37 PEL Study – Appendix A
State Route 37 PEL Study – Appendix B
State Route 37 PEL Study – Appendix C
State Route 37 PEL Study – Appendix D
State Route 37 PEL Study – Appendix E
State Route 37 PEL Study – Appendix F
State Route 37 PEL Study – Appendix G
State Route 37 PEL Study – Appendix H
State Route 37 PEL Study – Appendix I
State Route 37 PEL Study – Appendix J
State Route 37 PEL Study – Appendix K
Caltrans began working on the PEL Study in 2020 and engaged stakeholders and the public throughout its development to provide input and comments. View past public meetings, information and other studies that helped inform the development of the PEL Study.
Public Meetings
- September 14, 2022 Public Meeting
- Watch the public meeting
- View the presentation: English Presentation (PDF), Spanish Presentation (PDF), or Tagalog Presentation (PDF).
- Review the Public Meeting Summary (PDF).
- January 25, 2022 Public Meeting.
- May 26, 2021 Public Meeting
- Watch the Public Meeting.
- April 15, 2021 Town Hall Meeting
Virtual Tours
- Take a Virtual Tour of the SR 37 corridor.
Learn More
- Review previous studies, assessments, and reference documents.
- Learn about the development of the PEL Study.
One Corridor, One Team
Caltrans, the Metropolitan Transportation Commission (MTC), and the transportation authorities for Marin, Sonoma, Napa, and Solano counties worked together on the PEL Study to identify and narrow the range of alternatives to be advanced for environmental review and construction. They integrated previous studies and assessments conducted for the corridor while working to identify long term solutions. Learn more about collaborative efforts for the SR 37 corridor by visiting Resilient 37 – Sonoma County Transportation Authority (ca.gov).