California Department of Transportation

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The SR 4 CSMP is available

Congestion Relief along the California Delta Highway

State Route 4 is an east-west route providing interregional connection between the Central Valley and Bay Area. SR-4 provides access to the interstate system (connecting to I-80, I-680) and regional routes such as SR 242.  As the SR 4 bypass is completed this route will provide access to I-580 in the Tri Valley.

The State Route 4 corridor being addressed in the CSMP is over 31 miles long and begins in the city of Hercules at I-80, traversing unincorporated Contra Costa County, as well asd the cities of Martinez, Concord, Pittsburg and Antioch before ending at the SR 4/SR 160 interchange. The segment between I-80 and I-680 is classified as a principal arterial while the remaining segments are freeway.

Corridor Specific Issues

  • Regional connection between I-80 and I-680; interregional connection to Delta region and Stockton. 
  • Commuter link between East Contra Costa County and other East Bay-San Francisco employment centers.
  • High rates of delay due to commute, freight and recreational traffic.
  • Adoption of the State Route 4 Bypass into the State Highway System in progress.
  • BART serves much of the corridor east of SR 242; eBART is planned as a major extension.
  • Jobs/Housing imbalance a factor in congestion growth .
  • Bicycle/ Pedestrian access barriers to transit exist in many communities.

Corridor Mobility Improvement Account (CMIA) Projects

The CSMP requirement is noted in the Baseline Agreements of all projects receiving CMIA funding. CMIA funds have been allocated for the following improvement project on the SR-4 Corridor:

  • Widen from Somersville Road to SR-160


View a copy of the SR-4 Fact Sheet by clicking here.

For More Information, please contact: 

Erik Alm
Office of System Planning
District 4 





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