Watch Flood in the Desert (2022) : Full Movie Online Free Explore the 1928 collapse of the St. Francis Dam, the second deadliest disaster in California history. A colossal engineering and human failure, the dam was built by William Mulholland, a self-taught engineer who ensured the growth of Los Angeles by bringing the city water via aqueduct. The catastrophe killed more than 400 people and destroyed millions of dollars of property.