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A cross section view of the St Francis Dam after collapse Another view of the St Francis Dam after collapse. Two and a half minutes before midnight on March 12, 1928, the St. Francis Dam catastrophically failed. The same view of the "Tombstone" post-collapse. The west (left) abutment was entirely swept away.
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 billion gallons (47 billion liters) of water that surged down San Francisquito Canyon and emptied into the Santa Clara River, flowing down the river valley to the ocean.
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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.
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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.
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.