Overnight Caldecott Tunnel closures spell traffic trouble for East Bay commuters
Westbound traffic on the approach to the Caldecott Tunnel is backed up as one bore in each direction is closed to weather impacts in Orinda, Calif., on Friday, Dec. 26, 2025. (Photo by Dan Hernandez/San Francisco Chronicle via Getty Images)
OAKLAND, Calif. - Caltrans will be closing three of the four Caldecott Tunnel bores overnight through the end of the month for maintenance and other work, potentially causing some traffic headaches for commuters who navigate the East Bay in the twilight hours.
When will the Caldecott Tunnel bores be closed?
What we know:
Bores 1, 2 and 4 of the Caldecott Tunnel on State Route 24 will be closed on separate days from 10 p.m. to 4:30 a.m. beginning Monday for cable relocation, tunnel washing and routine maintenance, Caltrans said.
Only one bore will be closed at a time, while all other tunnel bores in both directions will remain open to traffic.
The closures are scheduled for:
- Bore 1 eastbound closure, April 27
- Bore 2 eastbound closure, April 28
- Bore 4 westbound closure, April 29 and April 30
What's next:
Caltrans said the schedule is dependent on weather conditions and may be subject to change.
Message signs will be placed to help guide drivers passing through the area, and commuters were advised to anticipate possible delays and plan for additional travel time.
The Source: Caltrans