Tuesday, August 11, 2026, and Wednesday, August 12, 2026, 10:00 p.m. to 4:30 a.m.
Alameda and Contra Costa Counties – Caltrans is slated to close the Caldecott Tunnel Bore 3 on westbound SR-24 overnight in Alameda and Contra Costa counties on Tuesday, August 11, 2026, and Wednesday, August 12, 2026, the closures will start at 10:00 p.m. and end at 4:30 a.m. the following morning. These closures are necessary for circuit breaker services and routine maintenance. All other tunnel bores in both directions will remain open to traffic. Please be aware that this schedule depends on weather conditions and may change.
Bore #3 Closures WB SR-24 10:00 PM to 4:30 AM
- Tuesday, August 11, 2026
- Wednesday, August 12, 2026
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, follow 511.org on Twitter.
For real-time traffic, visit Caltrans QuickMap at Quickmap.dot.ca.gov.
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