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The St. Francis Dam National Memorial Foundation is a non-profit organization, established in 2019, with the goal of raising funds to support the United States Forest Service in building and maintaining the St. Francis Dam Disaster National Memorial and Monument, including the construction of a visitor center and a memorial wall with the names ...
September 25, 1939 – A tropical storm known as El Cordonazo, or The Lash of St. Francis, made landfall near Long Beach with sustained winds of 50 mph (85 km/h), which as of 2025 is the most recent tropical storm landfall in California. The storm killed 45 people across southern California, and another 48 people at sea, with residents caught ...
St. Francis Dam: Accident – dam failure Santa Clarita, California: 581 1947 Texas City disaster: Accident – explosion Texas City, Texas: Ammonium nitrate on board ship 501+ 1896 Tornado outbreak sequence of May 1896: Tornado outbreak sequence Central United States, Southern United States: $2,900,000,000 (1997)
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.
William Mulholland (September 11, 1855 – July 22, 1935) was an Irish American self-taught civil engineer who was responsible for building the infrastructure to provide a water supply that allowed Los Angeles to grow into the largest city in California.
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.
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Within days after the collapse of the St. Francis Dam in March 1928, William Mulholland ordered the Hollywood Reservoir lowered due, in part, to public fears of a repeat disaster. Shortly after the disaster and in the years following, several engineering panels met to discuss the safety of the dam.