State Route 37 Sears Point to Mare Island Improvement Project
10 Documents in Project
Summary
SCH Number
2020070226
Lead Agency
California Department of Transportation, District 4
(DOT)
Document Title
State Route 37 Sears Point to Mare Island Improvement Project
Document Type
NOD - Notice of Determination
Received
Posted
12/8/2025
Document Description
The purpose of the Project is to address reoccurring congestion on SR 37 in Sonoma, Napa, and Solano counties where the highway narrows to one lane in each direction between SR 121 and Mare Island.
A Supplemental EIR has been prepared to address project changes since the 2023 EIR/EA was finalized. Changes include: adding maintenance vehicle pullouts and CHP enforcement areas, adding traffic control and safety devices, adding changeable and extinguishable message signs, relocating the toll gantry, and enhancing the degraded marsh habitat at Strip Marsh East. Strip Marsh East enhancement is a nature-based solution to minimize SR 37’s vulnerability to flooding in the near-term and to minimize project impacts on wetlands, waters, and special-status species habitats. No new significant impacts would result from these project changes, and no new mitigation measures are required. There is no change to project determinations (see NOD).
Contact Information
Name
Skylar Huyen Nguyen
Agency Name
California Department of Transportation, District 4
Job Title
Senior Environmental Scientist (Specialist)
Contact Types
Lead/Public Agency
Address
Phone
Email
Location
Cities
Vallejo
Counties
Solano, Sonoma
Regions
San Francisco Bay Area
Cross Streets
Various
Zip
Various
Total Acres
N/A
Parcel #
Primarily State Right-of-Way and Wildlife Refuge
State Highways
121, 37, 29
Railways
Sonoma-Marin Area Rail Transit
Schools
Federal Terrace Elementary School
Waterways
Tolay Creek, Sonoma Creek, Napa River
Other Information
Project is located along SR-37 between Lakeville Highway and Vallejo, and at the Strip Marsh East unit managed by the USFWS San Pablo Bay National Wildlife Refuge. The Project limit is: 04-SON-SR 37 (postmile 2.4/6.2); 04-SOL-SR 37 (postmile 0.0/8.5); 04-SON-121 (postmile 0.0/0.2).
Notice of Determination
Approving Agency
California Department of Transportation, District 4
Approving Agency Role
Lead Agency
Approved On
County Clerks
Solano, Sonoma
Final Environmental Document Available at
https://dot.ca.gov/caltrans-near-me/district-4/d4-popular-links/d4-environmental-docs
Determinations
(1) The project will have a significant impact on the environment
No
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
Yes
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
No
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
No
(3) Mitigated measures were made a condition of the approval of the project
Yes
(4) A mitigation reporting or monitoring plan was adopted for this project
Yes
(5) A Statement of Overriding Considerations was adopted for this project
No
(6) Findings were made pursuant to the provisions of CEQA
Yes
Attachments
Notice of Determination
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