The West Side Bridges Retrofit will seismically retrofit eight existing bridge structures along Treasure Island Road to meet current seismic safety standards. One of the structures will be seismically retrofitted, while the remaining bridges will be demolished and replaced. These bridge structures are a critical connection between Yerba Buena Island, Treasure Island, and the Bay Bridge.
This project is part of the I-80 Interchange Improvement Project, an effort to replace and retrofit key roads and on- and off-ramps that connect the I-80 (the highway on the Bay Bridge) and Yerba Buena Island. The Transportation Authority is working jointly with the Treasure Island Development Authority and the Office of Economic and Workforce Development on this effort. These upgrades will support the Treasure Island Transportation Program.
Timeline and Status
The Transportation Authority completed the environmental clearance in fall of 2017 and has been continuing with preliminary engineering. Final design and right of way certification activities are targeted for completion in 2021. The project is currently anticipated to start construction in 2021, with completion targeted by 2024.
The Transportation Authority is leading the design and construction of this project in collaboration with the Treasure Island Development Authority.
Cost and Funding
The total cost of the West Side Bridges Retrofit is $82,900,000. Funding comes from $73,400,000 in Federal funds, $7,200,000 in State funds, and $2,300,000 from the Treasure Island Development Authority.