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Map showing the location of the former St. Francis Dam and reservoir north of Santa Clarita between two later, still extant reservoirs – Castaic and Bouquet. Looking downstream in San Francisquito canyon after dam collapse Gnarled railroad tracks of the Santa Paula Branch Line near Piru Concrete ruins of the St. Francis Dam remain strewn ...
English: Shaded relief terrain map of the area around the failed en:St. Francis Dam and reservoir, showing also the locations of two other large reservoirs constructed later. Roads and boundaries are shown in their current (2013) arrangement.
St. Francis Dam (1926–1928) - failed March 12, 1928; San Clemente Dam - intentionally removed in 2015-2016 because of environmental issues; Van Norman Dams (1911–1971) - failed February 9, 1971, in 1971 San Fernando earthquake
Between 1924 and 1926, the canyon was the site of the construction of the St. Francis Dam. The Los Angeles Department of Water and Power began filling a reservoir in the San Francisquito Canyon in 1926. At 11:57 pm on March 12, 1928, the dam catastrophically failed, and the resulting flood took the lives of at least 431 people.
The St. Francis Dam was built on San Francisquito Creek in San Francisquito Canyon, and completed in 1926. It was part of the Los Angeles Aqueduct system, creating a storage reservoir for the imported Owens Valley water. The dam failed in 1928, due to a then undetectable geological weakness in the bedrock.
The failure and near complete collapse of the St. Francis Dam took place in the middle of the night on March 12, 1928. The dam was holding a full reservoir of 12.4 × 10 9 US gal (4.7 × 10 10 L) of water that surged down San Francisquito Canyon and emptied into the river.
Members of the Cordova family were scouts for the U.S. Army during the Mexican War in 1846 and helped identify bodies during the St. Francis Dam disaster in San Francisquito Canyon in 1928. Operations scaled back in 1967 when the government seized around 1,000 acres (400 ha), including the ancestral ranch-house, for the planned Castaic Lake and ...
The resulting St. Francis Dam was completed in 1926 and created a reservoir capacity of 38,000 acre-feet (47,000,000 m 3). On March 12, 1928, the dam catastrophically failed, sending a 100-foot high (30 m) wall of water down the canyon, ultimately reaching the Pacific Ocean near Ventura and Oxnard, and killing at least 431 people.