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The design of the St. Francis Dam was in fact an adaptation of the Mulholland Dam, with modifications made so as to suit the site. Most of the design profiles and computation figures of stress factors for the St. Francis Dam came from this adaptation of the plans and formulas which had been used in the constructing of the Mulholland Dam.
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 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.
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Around midnight on March 12, 1928, the 195 foot St. Francis Dam in the San Francisquito Canyon above what is now the city of Santa Clarita in California failed catastrophically. At least 431 people were killed as the 47,000,000 m 3 reservoir emptied into the Pacific Ocean near Oxnard, nearly 50 miles away. [ 34 ]
St. Francis Dam Disaster Site San Francisquito Canyon 34°32′49″N 118°30′45″W / 34.546944°N 118.5125°W / 34.546944; -118.5125 ( St. Francis Dam Disaster
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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.