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Burst water main floods Bay Bridge lanes in Treasure Island tunnel

A water main break in the Treasure Island tunnel of the San Francisco-Oakland Bay Bridge has flooded some eastbound lanes just ahead of the afternoon commute Tuesday.

The California Highway Patrol said in a traffic alert at 1:43 p.m. that the water main break above the eastbound lanes inside the tunnel prompted the closure of the number 4 and 5 lanes.

Caltrans and the San Francisco Fire Department were at the scene attempting to resolve the incident, the CHP said.

Bay Bridge Treasure Island flooding
California Highway Patrol and San Francisco Fire Department units at the scene of flooding inside the Treasure Island tunnel on the San Francisco-Oakland Bay Bridge, April 21, 2026. California Highway Patrol

As of 2:22 p.m., the CHP said all lanes had reopened.

There was no immediate word on what caused the water main break.

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