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San Francisco, California / Landmarks

Bay Bridge

A massive engineering marvel connecting San Francisco and Oakland, this historic complex is four times longer and twice as busy as the Golden Gate Bridge.

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Bay Bridge
baybridgeinfo.org, og_image_baybridgeinfo.org

What is the Bay Bridge known for?

The Bay Bridge is a complex of bridges spanning the San Francisco Bay, featuring one of the longest bridge spans in the United States and the largest diameter bore tunnel in the world.

When was the Bay Bridge constructed?

The bridge was constructed in 1936 to support the growing use of public transit lines and automobiles.

Can pedestrians and cyclists use the Bay Bridge?

Yes, there is a protected bicycle and pedestrian pathway on the segment between Oakland and Yerba Buena Island.

What are the carpool lane hours on the Bay Bridge?

Weekday carpool lanes are available Monday through Friday, from 5:00 AM to 10:00 AM and 3:00 PM to 7:00 PM.

How does the Bay Bridge compare to the Golden Gate Bridge?

The Bay Bridge is six months older, four times as long, and twice as busy as the Golden Gate Bridge.

What should I check before going?

Use Gyde for context, then check official sources for current hours, tickets, construction, and closures.

What to know

The San Francisco-Oakland Bay Bridge is a colossal complex of bridges spanning the San Francisco Bay. Originally constructed in 1936 to support the rapid growth of public transit lines and automobiles, it serves as a critical link on Interstate 80 between San Francisco and Alameda counties. Its historical importance was formally recognized in 2001 when it was listed in the National Register of Historic Places. Architecturally, the bridge is a multifaceted feat of engineering. It consists of two main segments: a suspension span running from San Francisco to Yerba Buena Island, and a skyway and single-anchored suspension bridge extending from the island to Oakland. These segments are linked by a bore tunnel that is described as the largest diameter bore tunnel in the world. The bridge's East Span underwent a massive modernization, with a new 625-meter-long section opening on September 2, 2013. This $1.8-billion project, completed by the American Bridge/Fluor Joint Venture, introduced a single-tower, self-anchored suspension bridge designed to cross the shipping channel safely. This modern addition complements the skyway structure that traverses the shallower waters near the Oakland shore. Today, the Bay Bridge acts as the region's primary workhorse, carrying approximately 260,000 vehicles daily across its two decks. This volume is so immense that the bridge carries more than a third of the traffic of all state-owned bridges in California combined.

Visitor tips

  • If visiting the Oakland side, look for the protected bicycle and pedestrian pathway on the skyway segment.
  • Be mindful of carpool lane hours (Monday-Friday, 5:00AM-10:00AM and 3:00PM-7:00PM) if driving across.
  • Visit at sunset to see the scale of the bridge against the San Francisco skyline.

Nearby context

The bridge serves as the primary gateway connecting the urban core of San Francisco to the East Bay, bridging the gap between San Francisco and Alameda counties.

Sources

Evidence and links