Mare Island Bridge Update July 2026

Repair work on the Mare Island Causeway Bridge has slowed temporarily due to nearby nesting activity from the California Black Rail, a threatened native species. The birds are currently nesting in the adjacent wetlands, and environmental requirements limit the construction activities that can take place during this period. In coordination with the California Department of Fish and Wildlife, the City has retained a biologist to monitor the nesting of the birds who will determine when the birds have cleared the area so full operations can resume.

Below is a detailed update on project tasks and overall progress.

Painting of the lift towers is now fully complete. Beginning July 1, 2026, the lift span is operating on its normal schedule with no time restrictions, as directed by the U.S. Coast Guard.

Sidewalk installation is moving slowly due to nesting season limitations established by the California Department of Fish and Wildlife. Additional delays have resulted from issues such as Island Energy cable conflicts, weather, and materials.

Installation of light posts and light poles on the south side of the bridge is complete.

Installation of the bridge logo is rescheduled for September 2026.

Guardrail post installation and handrail painting on the south side are approximately 70 percent complete.

Work beneath the bridge deck and on the deck surface remains ongoing.

At this time, the overall project is approximately 65 percent complete. The projected completion date has shifted from mid-February 2027 to March 2027.

The City will continue providing updates as work progresses.