San Pablo Dam Road/I-80 Interchange Improvement Project

The Interstate 80/San Pablo Dam Road interchange provides access between residential areas north and east of the interchange and Bay Area employment centers. The interchange is currently experiencing severe peak hour congestion, resulting in extensive delays. Future traffic forecasts indicate that existing congestion is projected to increase, resulting in further deterioration of traffic operations. Improvements will address current major delays and limited room for pedestrians and bicyclists, and the project will improve access for everyone. 

This project significantly benefits both vehicular and pedestrian/bicycle traffic by enhancing operations and safety within the interchange area and adjacent interchanges at El Portal Drive and McBryde Avenue. It will improve traffic operations, reduce traffic congestion, create efficent and safe bicycle/pedestrian access at the interchange, and accommodate future traffic volumes on San Pablo Dam Road. The project will also provide safer access to Riverside Elementary school by expanding shoulders, sidewalks, bicycle access, and overcrossings. 

To see the improvements planned for this project and how they will be phased in, check out this video overview:



The project is part of the Measure J Expenditure Plan approved in 2004 by 71 percent of the voters in Contra Costa County. The I-80/San Pablo Dam Road Interchange Project is supported by the City of San Pablo, Contra Costa County, Contra Costa Transportation Authority, West Contra Costa Unified School District (WCCUSD), California Department of Transportation (Caltrans), Federal Highway Administration, North East Neighborhood Council and the general public.

Phase 1 will be complete in Spring 2017. Thank you for your cooperation and patience during this important work.

For more information, please call the project hotline at (510) 277-0444. Construction updates will also be posted to Twitter at @i80spdr.

Documents and Updates
Phase I Design
Construction work continues on El Portal Drive – 2/22/2016 Update
Comprehensive Fact Sheet - 3/16/2016
May 14-15, 2016 I-80 Closure Announcement
June 18-19 I-80 Closure Announcement
August 20-21 I-80 Closure Announcement
November 5-6 I-80 Closure Announcement