Yerba Buena Island I-80 Interchange Improvement Project

The San Francisco County Transportation Authority (Transportation Authority) is working jointly with the Treasure Island Development Authority (TIDA) and the Office of Economic and Workforce Development (OEWD) on the development of the Yerba Buena Island (YBI) I-80 Interchange Improvement Project. TIDA and OEWD asked the Transportation Authority, in its capacity as the San Francisco’s Congestion Management Agency (CMA), to lead the effort to prepare and obtain approval for all required technical documentation for the YBI I-80 Interchange Improvement Project because of our expertise in funding and interacting with the California Department of Transportation (Caltrans) on technical aspects of the project.

This project is independent of but closely coordinated with the Caltrans San Francisco Oakland Bay Bridge (SFOBB) projects and the TIDA Treasure Island Redevelopment project. The project is funded with Federal Highway Bridge Program (HBP), Proposition 1B Local Bridge Seismic Retrofit Account (LBSRA) and TIDA local match funds.

The scope of the YBI I-80 Interchange Improvement Project includes two major components:

  • On the east side of the island, the I-80/YBI Ramps project will construct new westbound on and off ramps to the new Eastern Span of the Bay Bridge.
  • On the west side of the island, the YBI West-Side Bridges Retrofit project will seismically retrofit the existing bridge structures—critical components of island traffic circulation between the islands and the Bay Bridge.

YBI I-80 East Side Ramps

YBI Interchange project components thumbnail

The YBI I-80 East Side Ramps project will relocate the westbound exit ramp to the north side of I-80 and reconstruct the westbound entrance ramp on the north side of I-80 onto the SFOBB. The project will improve traffic safety, geometric design, and traffic operations of the ramps. Total estimated project cost is $95.67M.

A joint CEQA/NEPA document prepared by the Transportation Authority and Caltrans in the form of a Final Environmental Impact Report/Environmental Impact Statement (FEIS/FEIR) was completed for the project in December 2011. The FEIS/FEIR was re-validated in June 2012 to account for additional temporary improvements required by the US Coast Guard.

On December 17, 2013, the Transportation Authority Board approved award of the construction contract in the amount of $49,305,345.50 to Golden State Bridge, Inc. GSB’s DBE participation goal of 13.8% exceeded the contractual requirements of 12.5%. Construction contract work started in January 2014 with completion targeted for mid-2016.  The Project Commencement Ceremony was held on March 7, 2014 on Treasure Island. 

Due to unseasonably warm weather, early nesting of birds has begun. As a result, tree removal activities have been delayed. In order to minimize impacts and delays, Parsons Brinckerhoff, the Construction Management team for the project, is working closely with the project biologist and Caltrans Oversight team to dismantle nests prior to them becoming active. Furthermore, Caltrans has granted access to key construction zones ahead of schedule to allow early construction.

Available downloads:


YBI Westside Bridges Retrofit thumbnail

The YBI West-Side Bridges Retrofit project will retrofit eight existing bridge structures along Treasure Island Road to meet current seismic safety standards. Five of the structures will be seismically retrofitted, while three will be demolished and replaced. Total estimated project cost is $46.39M.

Seismic Strategy Reports prepared by the Transportation Authority were approved in October 2011. A joint CEQA/NEPA document prepared by the Transportation Authority and Caltrans in the form of a Categorical Exemption/Categorical Exclusion was completed in December 2012.

Detailed design and right of way certification efforts have begun and completed to 35% in 2013. Final design and right-of-way certifications are expected to be complete by in early 2015. Construction of these improvements will be coordinated with completion of the I-80/YBI Ramps and SFOBB construction efforts. The project is currently anticipated to start construction in mid-2016 with completion targeted by late 2018.

Available downloads: