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.

May 2024: PEL Addendum

Caltrans is working on an addendum to the PEL Study to prioritize segments for future environmental review, design, construction, and implementation. 

View the presentation: 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

Virtual Tours

Learn More

One Corridor, One Team 

Caltrans, the Metropolitan Transportation Commission (MTC), and the transportation authorities for MarinSonomaNapa, 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).