Welcome to Caltrans District 4
 

The Caldecott Tunnel Project

The Caldecott Tunnel connects Alameda and Contra Costa Counties via State Route 24. The Caldecott Improvement Project proposes to alleviate traffic congestion along Route 24 by constructing a fourth bore of the Caldecott Tunnel.

The goals of the Caldecott Improvement Project are to:

  • Improve mobility for motorists and emergency crews along State Route 24 via the Caldecott tunnels
  • Reduce delays and improve travel times
  • Eliminate the need for daily tunnel lane reversals and merges
  • Enhance safety for the traveling public and Caltrans maintenance workers
  • Respond to Regional Measure 2 and Contra Costa County Measure J

    Lead Agencies for the Environmental Process
    Federal Highway Administration (FHWA)
    The California Department of Transportation (Caltrans)

    Participating Agencies for the Environmental Process
    Metropolitan Transportation Commission (MTC)
    Alameda County Congestion Management Agency (ACCMA)
    Contra Costa Transportation Authority (CCTA)

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