Tuesday, July 7, 2026, and Wednesday, July 8, 2026, from 10:00 PM to 4:30 AM
Alameda and Contra Costa Counties – Caltrans maintenance will conduct overnight closures of Bore 4 of the Caldecott Tunnel on westbound State Route 24 (SR-24) to perform ventilation and routine tunnel maintenance. All scheduled activities are subject to weather conditions and may be adjusted as required.
Bore #4 Closures WB SR-24 10 PM – 4:30 AM
- Tuesday, July 7, 2026
- Wednesday, July 8, 2026
During this closure, at least one bore in each direction will remain open.
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 for extra travel time. Please drive with caution through the construction zone. Slow for the Cone Zone.
To view more D4 Projects, visit: Caltrans D4 Traffic Advisory Publications. For current District 4 lane closure information click here.
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.
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