Chinatown and the St. Francis Dam disaster / 1920s
Chinatown's plot draws on a genuine Los Angeles catastrophe, although it deliberately rearranges history. In the film, Hollis Mulwray opposes a proposed dam because an earlier dam failure killed hundreds, an allusion to the St. Francis Dam disaster of March 12, 1928. William Mulholland, the real-life engineer who inspired parts of the Mulwray character, inspected the dam after its keeper reported cracks and brown water leaking from the foundation. At approximately 10:30 that morning, Mulholland declared the structure safe. Shortly before midnight, the dam catastrophically failed, sending a wall of water through the Santa Clara River Valley and into communities including Santa Paula. At least 431 people died, and the disaster effectively ended Mulholland's career. The film moves these events into a fictional 1937 conspiracy and changes Mulholland's historical role, turning its Mulwray-like figure into the dam's opponent. Its water plot is therefore not a literal secret history, but a dark fictional collage built from real engineering failure, political manipulation, land speculation, and the suffering caused by Los Angeles's expansion.
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