Planned Overnight Westbound Lane and Ramp Closures on Caldecott Tunnel | 511 Contra Costa

Planned Overnight Westbound Lane and Ramp Closures on Caldecott Tunnel

Below is the anticipated schedule of upcoming westbound ramp and lane closures associated with work on the Caldecott Fourth Bore Project. Please note that inclement weather may cause schedule changes.
Closures tentatively will begin Monday night, May 21 and will occur nightly through May 24 (ending in the early morning of May 25):

  • Overnight Westbound Fish Ranch Road Onramp Closures (in Orinda): Occurring nightly between the hours of 9 p.m. and 5 a.m.
  • Overnight Closures of right lanes on Westbound State Route 24 from the Camino Pablo Onramp (in Orinda) to Bore Three: Occurring nightly between the hours of 9:30 p.m. and 4 a.m.
  • Overnight Bore Three Closures (towards Oakland): Occurring nightly between the hours of 10 p.m. and 4 a.m.

Please note that due to the Memorial Day holiday weekend, there will be no planned closures in the evening of May 25, or during Memorial Day weekend. Nighttime closures will resume on Tuesday, May 29.
In addition to the excavation of a 3,400-foot-long tunnel north of the existing three bores, the $391.8 million Caldecott Fourth Bore Project includes traffic improvements on the eastern and western sides of the tunnel.
For more information on the upcoming closures visit the Traffic Page of the project website.

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