Soscol Junction

Napa County attracts more than five million visitors annually. Coupled with population growth in Solano and Sonoma counties, SR 29 and 221 have become major interregional highways serving residents, visitors, workers and freight.

Annually commuters endure up to 225* hours of delay in the morning and 630* hours of delay in the evening at Soscol Junction due to congestion. The Soscol Junction project is a crucial step in relieving future traffic congestion.

Congestion at Soscol Junction has worsened over time, fueled in part by tourism, population growth and economic development. Housing production is not keeping pace with the creation of new jobs in Napa. Consequently, Napa’s workers commute in from adjacent counties contributing to the traffic issues.

The existing highway configuration cannot accommodate the current traffic volumes – volumes that are likely to grow in the future.

Click here to view the Soscol Junction Fact sheet.

Project Updates

UPDATE 12/3/2020

The Soscol Junction Project is fully funded! Click here to read the press release.

UPDATE 2/10/2020

Caltrans Adopted the Final Environmental Document for the Soscol Jucntion Project. It is available at the link on the right

UPDATE 10/11/19 (click on lower right-hand corner of image frame to view in fullscreen mode)


UPDATE 9/20/19

Caltrans released an environmental document for the Soscol Junction Improvement Project in Napa County.  The Project proposes improvements to the existing  State Route 29/ State Route 221 signalized intersection.  The environmental document is an Initial Study with Proposed Mitigated Negative Declaration/Environmental Assessment under both CEQA and NEPA.  A public meeting will be held at NVTA  offices at 625 Burnell Street Napa, CA 94559 on Tuesday, October 8, 2019 from 5:30pm to 7:30pm.  Comments on the document will be accepted through October 20, 2019.  Comments can be emailed to or mailed to:


Cindy Fong, Associate Environmental Planner

California Department of Transportation, District 4

P.O. Box 23660, MS 8B, Oakland, CA 94623