Mare Island Causeway Bridge Update

Vallejo, CA - City of Vallejo Public Works crews' repairs on Saturday, October 17, for the existing drawbridge imbalance were not successful. During the effort, crews identified an additional mechanical issue. A large metal coupling that helps raise and lower the bridge was found to be broken. Because of this, it is not safe to operate the bridge for marine traffic. The City has notified the Coast Guard, and the bridge will remain unable to open until the coupling is replaced. Vehicle traffic will not be affected.

The coupling is a specialized part and not available off the shelf. The Public Works Department is working to locate a replacement. If one cannot be found, the part will need to be custom fabricated, and we do not yet have a timeline. Once the new coupling is obtained and installed, Public Works will schedule another closure to complete repairs related to the original imbalance.

The City will provide additional updates as soon as more information becomes available.

The temporary closure of the Mare Island Causeway Bridge to pedestrians and bicyclists also remains in place through October 23, 2026, to allow crews to perform essential bridge‑deck maintenance.

Traffic will be moved back to the left (south) side again on either Saturday, October 24, 2026, or Monday, October 26, 2026, if this week’s work is delayed due to rain.

The bridge will reopen to pedestrian and bicyclist traffic on Friday, Oct 23 at approximately 5:15 PM

During weekday work hours (7 AM to 5 PM), crews will apply polyester concrete and methacrylate—high‑performance materials that strengthen and extend the life of the bridge. These products contain chemicals classified as carcinogenic and may produce strong odors that could cause headaches, nausea, or irritation. For the safety of all pedestrians and bicyclists, the bridge and the trails beneath it will remain fully closed while this work is underway.

Alternative routes for pedestrians and bicyclists include:

The San Francisco Bay Ferry (Mare Island to Vallejo terminal); their schedule is available at https://www.sfbayferry.com/routes-schedules/vallejo/
The Highway 37 Napa River Bridge, approximately a 2.6‑mile detour
People with disabilities are encouraged to visit our City's ADA web page, email ada@cityofvallejo.net, or contact the Public Works Department’s general line (707) 648-5235 for assistance.

The City of Vallejo appreciates the community’s understanding and cooperation as we complete this critical infrastructure project. These improvements will help ensure the long‑term safety and reliability of one of our city’s key transportation links.

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555 Santa Clara Street | Vallejo, CA 94590 | cityofvallejo.net