Cypress Street Viaduct Case Study

374 Words 2 Pages
The collapse of the Cypress Street Viaduct in 1989 was a disaster caused by an earthquake. On October 17, 1989 an earth quake occurred around the Santa Cruz bay area. The Cypress Street Viaduct was the first double-decker viaduct in California and it was made in 1955 – 1957 and it cost 100 million dollars. On October 17, 1989, the southern portion of the structure collapsed during the 1989 Loma Prieta Earthquake, due to ground movement and structural flaws.
When in use, the upper and lower tier were both in use. Some sections of the Cypress Street Viaduct were largely supported by two columns on either side, but some sections were only supported beneath by a single supporting column. The design was unable to survive the earthquake because the

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