Alameda County — Caltrans has scheduled overnight closures of the Webster Tube (State Route 61) on select nights in April for tunnel maintenance. The closures will take place overnight, and the tube will remain open during the daytime.
Closure Details
- Tuesday, April 8, 2025 – 10:00 PM to 4:30 AM
- Wednesday, April 9, 2025 – 10:00 PM to 4:30 AM
- Thursday, April 10, 2025 – 10:00 PM to 4:30 AM
- Friday, April 11, 2025 – 10:00 PM to 4:30 AM
Traffic Control & Detour Information
- During closures, motorists should use the Posey Tube as an alternate route.
- Changeable message and directional signs will be in place to assist drivers.
- The California Highway Patrol (CHP) will be onsite to support traffic management.
Important Notes
- The tunnel will remain open during the daytime; closures are nighttime only.
- Work is weather dependent.
Caltrans thanks motorists for their patience as we perform this essential maintenance work.
Be Work Zone Alert and expect travel delays.
Caltrans will update its X page at https://twitter.com/CaltransD4 on the latest highway conditions, and drivers are encouraged to check out Caltrans Quickmap http://quickmap.dot.ca.gov/
Motorists can also receive 24/7 highway condition information statewide by calling 1-800-427-ROAD or 1-800-427-7623.
Thank you for your patience as we work to maintain our state’s highways, bridges, and tunnels.
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