The Cypress Street Viaduct, often referred to as the Cypress Structure, was a 1.6 mile long, raised two-tier, multi-lane (four lanes per deck) freeway constructed of reinforced concrete that was originally part of the Nimitz Freeway (State Highway 17, and later, Interstate 880) in Oakland, California.
It replaced an earlier single-deck viaduct constructed in the 1930s as one of the approaches to the San Francisco – Oakland Bay Bridge. It was located along Cypress Street between 7th Street and Interstate 80 in the West Oakland neighborhood.
It officially opened to traffic on June 11, 1957 and was in use until the 1989 Loma Prieta earthquake, when much of the upper tier collapsed onto the lower tier resulting in 42 fatalities.
Read more about Cypress Street Viaduct: Construction, Loma Prieta Earthquake, Reconstruction Around West Oakland, Exit List, Gallery, Similar Structures Damaged By Earthquakes
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