Vallejo Will Close Mare Island Causeway Bridge

The bridge faces a full traffic closure on October 17, 2026, due to mechanical alignment issues.

Updated on Oct. 14, 2026 in Openings & Closings

Isometric editorial illustration of a heavy industrial bridge mechanism in muted teal and mustard tones, representing urban infrastructure repair. — The City of Vallejo will close the Mare Island Causeway Bridge on October 17, 2026, for essential mechanical repairs and alignment work. AI Illustration. Upload story photo >

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The City of Vallejo will close the Mare Island Causeway Bridge to all traffic on October 17, 2026. This full closure will last from 9 a.m. to 3:45 p.m. as crews perform essential repairs.

Why it matters

The bridge is experiencing a mechanical imbalance causing a vertical misalignment on its east side span. These repairs are necessary to restore safety and functionality to the crossing.

Crews will apply polyester concrete and methacrylate to the bridge deck to address the mechanical imbalance. The city has mandated a full closure to vehicles, pedestrians, bicyclists, and marine traffic during the specified repair window.

The players

City of Vallejo

The local municipal government responsible for managing city infrastructure and public works projects.

The details

Vehicle traffic must reroute to the Highway 37 Napa River Bridge during the maintenance period. Beyond the single-day full closure, the bridge will remain closed to pedestrians and bicyclists on weekdays through October 23, 2026.

October 17, 2026, 9 a.m. to 3:45 p.m.: Full closure of Mare Island Causeway Bridge.
Every Monday at 7 a.m.: Bridge closes to pedestrians and bicyclists.
Every Friday at 5:15 p.m.: Bridge reopens to pedestrians and bicyclists.
Weekdays through October 23, 2026: Bridge closed to pedestrians and bicyclists.

Market Landscape

Infrastructure maintenance projects like this align with broader regional efforts to preserve aging transit assets. Such closures reflect the ongoing operational demands of maintaining connections across the Napa River and surrounding waterways.

Motorists must plan to use the Highway 37 Napa River Bridge for the duration of the October 17 closure. Pedestrians and bicyclists should note that the bridge remains off-limits on weekdays through October 23, 2026.

The takeaway

Travelers should monitor local traffic advisories throughout the week to avoid delays during the maintenance period. The bridge will continue to follow a weekday closure pattern for non-motorized traffic until the project concludes on October 23.