Improving access to Yerba Buena Island and Treasure Island

Photo of the Bay Bridge meeting Yerba Buena Island

The Transportation Authority is working jointly with the Treasure Island Development Authority and the Office of Economic and Workforce Development on the Yerba Buena Island I-80 Interchange Improvement Project.

The goal of this project 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. These upgrades will help support the new neighborhood being built on Treasure Island.

The Yerba Buena Island I-80 Interchange Improvement Project includes three major components:

  • I-80 East Side Ramps Project (complete): New westbound on- and off-ramps on the east side of Yerba Buena Island are now in use, connecting the island to the eastern span of the Bay Bridge. Project cost: $100.1 million.
  • Southgate Road Relocation (in progress): This project will relocate Southgate Road, the critical local road connection between the I-80 westbound and eastbound on- and off-ramps. Project cost: $36.4 million.
  • West Side Bridges Retrofit (in progress): This effort will seismically retrofit the existing bridge structures on the west side of Yerba Buena Island—a critical connection between Yerba Buena Island, Treasure Island, and the Bay Bridge. Project cost: $66.3 million.

Vista Point (complete): In addition to the above improvements, the Transportation Authority developed “Vista Point”—a destination on Yerba Buena Island near the Bay Bridge east span bicycle/pedestrian path where visitors can enjoy a view of the Bay and use restrooms, benches, a hydration station, and bike racks.

Project background

The Transportation Authority is working jointly with the Treasure Island Development Authority and the Office of Economic and Workforce Development on the Yerba Buena Island I-80 Interchange Improvement Project. The Transportation Authority is also responsible for designing a transportation plan for the new Treasure Island development.

This project is independent of but closely coordinated with the Caltrans San Francisco Oakland Bay Bridge new East Span projects and the Treasure Island Redevelopment project. The project is funded with Federal Highway Bridge Program, Proposition 1B Local Bridge Seismic Retrofit Account, and Treasure Island Development Authority local match funds.


Photo via Flickr Commons, William Stuben (image croppped and lightened).