Project Details

Owner: Transbay Joint Powers Authority

Contract value: $58,420,000


The Transbay Transit Center in downtown San Francisco will be the new regional transportation hub and serve eleven transportation systems including AC Transit, BART, Caltrain, Golden Gate Transit, Muni and California’s future High Speed Rail. The Bus Ramps is an elevated bridge structure that will cross above several of San Francisco’s main commute thoroughfares and will provide direct bus access from the Transbay Transit Center to the Bay Bridge as well as a future Bus Storage Facility. The Bus Ramp consists of a section of concrete box girder viaduct that connects to the Bay Bridge, a cable stayed bridge span and a section of steel box girder. The purpose of the project is to reduce congestion and minimize travel times by keeping busses off of the city streets.

From I-80, busses will travel over an on-grade section, cross over Harrison Street on bridges supported by abutments, travel down a 450’ long section of road supported by mechanically stabilized earth (MSE) and cross over several San Francisco streets on a 700’ long box girder viaduct before crossing over Howard Street on the cable stayed bridge. The final 50’ connecting the Cable Stay Bridge to the Transbay Transit Center will be a structural steel span.