The St. Francis Dam was a curved concrete gravity dam, built to create a large regulating and storage reservoir as part of the Los Angeles Aqueduct. It was located in San Francisquito Canyon, about 40 miles (64 km) northwest of Los Angeles, California, approximately 10 miles (16 km) north of the city of Santa Clarita. The name "St. Francis" is an anglicized version of the name of the canyon.
The dam was designed and built between 1924 and 1926 by the Los Angeles Department of Water and Power, then named the Bureau of Water Works and Supply. The department was under the supervision of its chief engineer, William Mulholland.
At two and a half minutes before midnight on March 12, 1928 the dam failed catastrophically and the resulting flood killed up to 600 people. The collapse of the St. Francis Dam is considered to be one of the worst American civil engineering failures of the 20th century and remains the second-greatest loss of life in California's history, after the 1906 San Francisco Earthquake and fire. The disaster marked the end of Mulholland's career.
Read more about St. Francis Dam: Planning and Design, Construction and Modification, Prelude To Disaster, Collapse and Flood Wave, Aftermath, Analysis, Mulholland Dam Reinforced, Present-day Remains, In Popular Culture
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