Tuesday, September 1, 2026, and Wednesday, September 2, 2026 10:00 p.m.- 4:30 a.m.
Alameda and Contra Costa Counties – Caltrans has scheduled overnight closures of Bore 2 of the Caldecott Tunnel on eastbound SR-24 to perform lighting upgrades and routine tunnel maintenance. For current District 4 lane closure information click here.
Eastbound SR-24 Bore #2 (left) Closures:
When:
- Tuesday, September 1, 2026
- Wednesday, September 2, 2026
Time:
- 10:00 p.m. to 4:30 a.m., Nightly
During these closures, all other bores in each direction will remain open. All work is weather dependent.
Traffic Control Measures:
Changeable message signs will be in place to assist motorists traveling in the area. Motorists are advised to expect delays, prepare to merge and allow extra travel time. Please drive with caution through the construction zone. 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.
To view more D4 Projects, visit: Caltrans D4 Traffic Advisory Publications.
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