California Department of Transportation

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Final Corridor System Management Plan

State Route 24 Corridor System Management Plan

A Regional Gateway Connecting Contra Costa and Alameda County

State Route 24 provides a regional connection between Contra Costa and Alameda counties; it  features the Caldecott Tunnel which functions as a regional gateway between I-680 to the east and I-80 and I-580 to the west. 

The Alameda County portion of State Route 24 is approximately 6.24 miles long. It begins at I-580 in Oakland, crossing State Route 13 before ending at the Alameda/Contra Costa County line. The Contra Costa portion is approximately 9.14 miles long. It begins at the Alameda/Contra Costa County line and terminates at I-680 in Walnut Creek.

Corridor Specific Issues

  • Key regional commuter route
  • Caldecott Tunnel functions as regional gateway
  • Officially designated Scenic Highway
  • Entire length of corridor served by BART
  • Local bus service serves as feeder access to BART and neighborhoods
  • Growth in Central and Eastern Contra Costa County has contributed to SR 24 congestion
  • Bicycl/Pedestrian access barriers to transit hubs exist in many communities 

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 24 Corridor: 

  • Caldecott Tunnel 4th Bore

View a copy of the SR 24 Fact Sheet by clicking here.

For More Information, please contact: 

Erik Alm
Office of System Planning
District 4 









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