San Francisco–Oakland Bay Bridge

suspension bridge connecting San Francisco and Oakland, California, USA

The San Francisco–Oakland Bay Bridge is a series of bridges across San Francisco Bay in the U.S. state of California. It is part of Interstate 80 in California.

San Francisco–Oakland Bay Bridge
The western section of the San Francisco–Oakland Bay Bridge
Coordinates37°49′5″N 122°20′48″W / 37.81806°N 122.34667°W / 37.81806; -122.34667
Carries10 lanes of I-80 throughout, and pedestrians and bicycles east of Yerba Buena Island (YBI)
CrossesSan Francisco Bay
via YBI
LocaleSan Francisco and Oakland, California, United States
OwnerState of California
Maintained byCalifornia Department of Transportation and the Bay Area Toll Authority
ID number
  • 34 0003 (West)
  • 34 0004 (YBI Tunnel)
  • 33 0025 (East)[1]
DesignDouble-decked suspension spans (two, connected by center anchorage), tunnel, cast-in-place concrete transition span, self-anchored suspension span, precast segmental concrete viaduct
MaterialSteel, concrete
Total lengthWest: 10,304 ft (3,141 m)
East span: 10,176 ft (3,102 m)
Total: 4.46 miles (7.18 km)
excluding approaches
WidthWest: 5 traffic lanes totaling 57.5 ft (17.5 m)
East: 10 traffic lanes totaling 258.33 ft (78.74 m)
HeightWest: 526 ft (160 m)[2]
Longest spanWest: two main spans
2,310 ft (704 m)
East: one main span
1,400 ft (430 m)
Clearance aboveWestbound: 14 feet (4.3 m), with additional clearance in some lanes
Eastbound: 14.67 feet (4.47 m)
Clearance belowWest: 220 feet (67 m)
East: 136 feet (41 m)
DesignerCharles H. Purcell
Construction startJuly 8, 1933
OpenedNovember 12, 1936; 87 years ago (1936-11-12)
Daily traffic260,000[3][4]
TollCars (east span, westbound only)
$7.00 (rush hours)
$2.50 (carpool rush hours)
$5.00 (weekday non-rush hours)
$6.00 (weekend all day)
DesignatedAugust 13, 2001
Reference no.00000525[1][5]

It has two spans over water. The western span is a suspension bridge. The eastern span is a self-anchored suspension bridge.[6] The eastern span used to be a cantilever bridge but it was removed once the new bridge opened. The cantilever span was destroyed in the 1989 Loma Prieta Earthquake, which is one of the reasons why the Eastern span was replaced.

The western span is a double suspension bridge with two decks. Westbound traffic is carried on the upper deck and eastbound on the lower deck. The new east span is a single deck with the eastbound and westbound lanes on each side. It is the world's widest bridge.[7]

References change

  1. 1.0 1.1 "National Register of Historic Places Registration Form". National Park Service – USDoI. Retrieved July 28, 2012.
  2. San Francisco-Oakland Bay Bridge Archived November 3, 2010, at the Wayback Machine
  3. "Traffic Census Program". California Department of Transportation. 2015. Retrieved July 14, 2017. Traffic Volumes: Annual Average Daily Traffic
  4. "San Francisco-Oakland Bay Bridge". Metropolitan Transportation Commission. Bay Area Toll Authority. 2014–15. Retrieved July 14, 2017. 45.5 million toll-paid vehicles (91.0 million trips) annually
  5. "National Register Information System". National Register of Historic Places. National Park Service. 2009-03-13.
  6. In a self-anchored suspension bridge the main cables are attached to the end of the road deck. This avoids having anchor points in unstable ground.
  7. Press release (California Department of Transportation) 2014. [1]