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Causes of the St. Francis Dam Collapse
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90 years ago today the St. Francis Dam collapsed - the second-deadliest disaster in California history. | Newsweek
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Visiting The Site Of L.A.'s Most Deadly Disaster: The Collapse Of The St. Francis Dam
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On this day in California history, tragedy struck. The St. Francis Dam was a concrete gravity dam located in San Francisquito Canyon in Los Angeles County built from 1924 to 1926 to serve Los Angeles's growing water needs. It catastrophically failed in 1928 due to a defective soil foundation, claiming the lives of at least 431 people. The collapse of the St. Francis Dam is considered to be one of the worst American civil engineering disasters of the 20th century and remains the second-greatest l
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MSNSidetrack Adventures
The St. Francis Dam didn't break from bad concrete. It broke because the ground beneath it failed. On March 12, 1928, this Los Angeles water supply dam held 12.4 billion gallons. Just before midnight, the foundation—built on unstable geological formations—collapsed catastrophically. The concrete structure itself remained largely intact as it slid away. Over 400 people died in the Santa Clara River Valley as the floodwaters rushed 54 miles to the ocean. Dam designer William Mulholland's career en
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