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San Francisco-Oakland Bay Bridge

San Francisco-Oakland Bay Bridge
Martin Chandrawinata
San Francisco-Oakland Bay Bridge

The San Francisco-Oakland Bay Bridge is the region's workhorse bridge, carrying more than a third of the traffic of all of the state-owned bridges combined.

It is made up of two bridge segments: a skyway structure/single anchored suspension bridge between Oakland and Yerba Buena Island, and a suspension span from the island to San Francisco. Connecting the two is the largest diameter bore tunnel in the world.

Seismic retrofit of the western span of the bridge was completed in 2004. The original eastern span, damaged in the 1989 Loma Prieta earthquake and subsequently repaired, was replaced on September 2, 2013.

The design of the new east span — selected by the Bay Area Toll Authority in 1998 — features a single-tower, self-anchored suspension bridge for the segment of the bridge that crosses the shipping channel, and a skyway structure over the shallower waters close to the Oakland shore.

Restricted Bicycle/Pedestrian Access to Treasure Island: Due to the realignment of Southgate Road on Yerba Buena Island, bicycle access to Treasure Island from the Vista Point at the west end of the Bay Bridge East Span path will be restricted to weekends and holidays only from Oct. 12, 2020. There will be no pedestrian access from the Vista Point to Treasure Island during this time.

Bridge Facts At-A-Glance
LOCATION: Interstate 80, between San Francisco and Alameda counties
STRUCTURE: Suspension, tunnel, skyway
LENGTH: 8.4 miles (including approaches and toll plaza)
CHANNEL SPAN: 1,400 feet


  • Original Structure: November 1936
  • New Structure (Just the Eastern Span): September 2013
  • 1936 Structure: $77 million (including the Transbay Transit Terminal)
  • 2013 Structure (Just the Eastern Span): $6.4 billion
AUTO TOLL: Weekday Peak Autos: $7
Weekday Peak Carpools: $3
Weekday Non-Peak Autos: $5
Weekends: $6
COLLECTION: One way, westbound, in Oakland
TRAFFIC LANES: Five lanes in each direction
FY 2018-19 TOTAL TOLL-PAID VEHICLES: 45,760,984
FY 2018-19 TOTAL TOLLS COLLECTED: $241,641,856
BRIDGE PATH COUNTER DATA: Access bicycle and pedestrian counter data