The 1989 Loma Prieta earthquake caused a failure of a single section of the upper deck of the eastern span of the San Francisco – Oakland Bay Bridge , which closed the bridge for 30 days . A replacement of the eastern span was completed in August 2013 . Engineers and much of the public had long recognized that a strong earthquake centered close to the bridge on either the Hayward or San Andreas faults could cause a complete collapse of the eastern span
1989 Loma Prieta earthquake
1989 Loma Prieta earthquake
Hayward Fault Zone