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Mare Island Causeway Bridge Information

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The Mare Island Causeway Bridge is located on the Napa River in the center of the Causeway, which crosses the Mare Island Strait at mile 2.8, Vallejo. The Bridge is 165 feet long and 48.5 feet wide. It provides crossing for vehicular, pedestrian and rail traffic.

Minimum Clearance (Span down)

12.4 feet (based on High High Mean Water)

Maximum Clearance (fully raised)

99.7 Feet (based upon High High Mean Water, 87.3 feet maximum lift height plus 12.4 feet distance to water)

Hours of Operation

The Mare Island Causeway Bridge is fully staffed with Bridge Operators and will open on signal from 6:00 a.m. until 10:00 p.m., every day, including Holidays. From 10:00 p.m. until 6:00 a.m. the Bridge can be opened if at least two hours notice is given. To give this notice, call the Fleming Hill Water Treatment Plant at 707-648-4313.


During hours of operation you can request a Bridge opening in the following manner:

bulletBy Sound Signal--Sound signals can be made by whistle, horn, megaphone, hailer or other device capable of producing the described signals loud enough to be heard by the Bridge Operator.
bulletTo request an opening, provide one prolonged blast followed by one short blast. If we are able to open, we will respond in like manner. If we cannot open immediately, we will sound five short blasts in rapid succession.
bulletBy Visual Signal--raise and lower a white flag vertically or a white, amber or green light vertically.
bulletBy Radio--call us on Marine Radio Channel 13 (156.650 MHz).
bulletBy Telephone--call the Bridge Control Room at 707-562-3556.
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