The eastern span replacement of the San Francisco–Oakland Bay Bridge is a construction project replacing an unsafe 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 largest public works project in California history, with an estimated cost of $6.4 billion.