Eastern span replacement of the San Francisco–Oakland Bay Bridge

The eastern span replacement of the San Francisco–Oakland Bay Bridge was a construction project to replace a seismically unsound portion of the Bay Bridge with a new self-anchored suspension bridge (SAS) and a pair of viaducts. The bridge is located in the U.S. state of California, and crosses the San Francisco Bay between Yerba Buena Island and Oakland. It was built between 2002 and 2013, and does not have a name other than the unofficial name of the bridge as a whole ("San Francisco-Oakland Bay Bridge"). The eastern span replacement is the most expensive public works project in California history, with an estimated cost of $6.4 billion. Originally scheduled to open in 2007, several problems delayed the opening until September 2, 2013. With a width of 258.33ft, comprising 10 general purpose lanes, it is currently the world's widest bridge, according to Guinness World Records.The Bay Bridge has two major sections: the western suspension spans and their approach structures between San Francisco and Yerba Buena Island (YBI), and the structures between YBI and the eastern terminus in Oakland. The original eastern section was composed of a double balanced cantilever span, five through-truss spans, and a truss causeway.