A burst water main caused flooding Tuesday afternoon on a portion of the eastbound Bay Bridge lanes inside the Yerba Buena Tunnel, leading to the brief closure of two traffic lanes.
The California Pacific Highway Patrol posted on X at 1:43 pm Tuesday that a water main had ruptured inside the Yerba Buena/Treasure Island tunnel above eastbound I-80. Eastbound lanes four and five were closed to traffic due to flooding.
***TRAFFIC ALERT on I-80 e/b***
— CHP San Francisco (@CHPSanFrancisco) April 21, 2026
Due to water main break above, the #4 & 5 traffic lanes of I-80 e/b (SF/Oakland Bay Bridge) in the Treasure Island tunnel are temporarily closed due to flooding. Caltrans & SF Fire are currently on-scene attempting to resolve the incident. pic.twitter.com/Oefx5VkWmy
Crews from Caltrans and the San Francisco Fire Department responded to the scene, and all lanes were re-opened 45 minutes later.
Drivers were advised to still use caution when driving through the tunnel.
The post was updated with the correct day — Tuesday. Apologies for the confusion.
Image: CHP/X
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