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 also a jewel along the San Francisco waterfront.


The San Francisco-Oakland Bay Bridge 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.

The design of the new East Span — which opened in September 2013 — 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.

The Bay Bridge in background with dismantled San Francisco-Oakland Bay Bridge in foreground
Seismic Safety

Seismic retrofit of the West Span of the San Francisco-Oakland Bay Bridge was completed in 2004. The original East Span was damaged in the 1989 Loma Prieta earthquake and subsequently repaired. The replacement East Span opened on September 2, 2013.

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)
Vertical Clearance: 220 feet
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:
  • $7
  • Weekday Peak Carpools: $3.50
Collection: One way, westbound, in Oakland
Traffic Lanes: Five lanes in each direction
FY 2020-21 Total Toll-Paid Vehicles: 39,324,095
FY 2020-21 Total Tolls Collected: $296,809,138
Bridge Path Counter Data: Access bicycle and pedestrian counter data