Webster Tube (State Route 61) Overnight Closures for Maintenance Work

Alameda County - Caltrans has scheduled overnight closures of the Webster Tube (State Route 61) starting tonight Monday July 7th through Wednesday 9th 10:00PM to 4:30AM each night, for tunnel maintenance. The closures will take place overnight, and the tube will remain open during the daytime.

Closure Details

• Monday, July 7, 2025 - 10:00 PM to 4:30 AM
• Tuesday, July 8, 2025 - 10:00 PM to 4:30 AM
• Wednesday, July 9, 2025 - 10:00 PM to 4:30 AM

Traffic Control & Detour Information

• During closures, motorists are encouraged to 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 hours; 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 https://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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