Proposed SR 37 Traffic Congestion Relief Project - Environmental Scoping and Virtual Open House


Notice of Preparation/Environmental Scoping and Virtual Open House

The California Department of Transportation (Caltrans) has initiated a public review period and is conducting a virtual open house to request comments on the scope and content of a planned Environmental Impact Report (EIR)/Environmental Assessment (EA) for the proposed State Route (SR) 37 Traffic Congestion Relief Project in Sonoma, Napa, and Solano counties.

Caltrans, in partnership with the Metropolitan Transportation Commission (MTC) and the Sonoma County Transportation Authority (SCTA), Solano Transportation Authority (STA), and Napa Valley Transportation Authority (NVTA) is proposing improvements to SR 37 from west of the SR 121 intersection to Mare Island, where the existing highway narrows to one lane in each direction. The project is focused on traffic congestion relief by improving traffic flow during peak travel times and increasing vehicle occupancy within the travel corridor. Three project alternatives are under consideration, including converting existing shoulders to part-time or full-time travel lanes, and/or installing a movable median barrier to provide a three-lane facility within the project limits. The additional lane(s) is intended to be a High Occupancy Vehicle (HOV) lane to provide an incentive to shift to multi-occupant vehicles.


Join us for a Virtual Scoping Open House

July 22, 2020 at 6:00-7:30 PM

Join via Zoom:
Password: 514380

Join by Phone: 1 669 900 6833
Webinar ID: 971 2825 8894

Caltrans and partners invite you to attend a virtual scoping open house to learn more about the Proposed   SR 37 Traffic Congestion Relief Project. Attendees will be able to ask questions about the material presented during the meeting; however, all scoping comments must be submitted in writing by email or mail. Attendance at the virtual open house is not required to submit comments.


How to Provide Comments

Please submit comments in writing by 5:00 PM on August 24, 2020 to:

   Caltrans District 4

   Attn: Yolanda Rivas

   P.O. Box 23660

   Oakland, CA 94623-0660


   or via email to:


For language translation, use the contact information below. Para la traducción de idiomas, use la siguiente información de contacto.

Yolanda Rivas, Caltrans District 4, 510-286-1204


For more information, go to