Overnight Closures of Caldecott Tunnel State Route 24 (SR-24) Bores #1, #2, and #4

Monday, April 27, 2026, through Thursday, April 30, 2026, from 10:00 PM to 4:30 AM, Nightly

Alameda and Contra Costa Counties - Caltrans is slated to close Bores 1, 2 and 4 of the Caldecott Tunnel on eastbound State Route 24 (SR-24) overnight in Alameda and Contra Costa counties. These closures will take place Monday, April 27, 2026, through Thursday, April 30, 2026, from 10:00 PM to 4:30 AM the next morning. These closures are needed for cable relocation, tunnel washing and routine maintenance. Only one bore will be closed at a time; all other tunnel bores in both directions will remain open to traffic. Please note that this schedule is dependent on weather conditions and may be subject to change.

Schedule for SR-24 10:00 PM to 4:30 AM

Bore #1 Eastbound Closure

• Monday, April 27, 2026

Bore #2 Eastbound Closure

• Tuesday, April 28, 2026

Bore #4 Westbound Closure

• Wednesday, April 29, 2026
• Thursday, April 30, 2026

*All work is weather dependent and subject to change.

Traffic Control Measures: Changeable message signs will help guide drivers passing through this area. Travelers should anticipate possible delays and plan for additional travel time. Exercise caution when driving through the construction zone and remember to reduce your speed and always slow for the cone zone.

For 24/7 traffic updates, please visit 511.org: https://x.com/511SFBay
For real-time information, visit Caltrans QuickMap: https://quickmap.dot.ca.gov
Follow us on X: https://x.com/CaltransD4
Or call 1-800-472-7623, 1-800-427-ROAD for state highway conditions statewide.