The St. Francis Dam: Mulholland's Catastrophe
California
Shortly before midnight on March twelfth, nineteen twenty-eight, William Mulholland's dam began to fail. The St. Francis Dam sat in San Francisquito Canyon, about ten miles east of where you are now.
It was the keystone of the water system Mulholland had built to make Los Angeles possible, the reservoir that would carry the city through a dry year. He had personally inspected it the day before. He had declared it sound.
At eleven fifty-seven that night, twelve-point-four billion gallons of water moved at once. The flood wave reached the Pacific Ocean at Ventura in approximately five and a half hours, fifty-four miles downstream, cutting through the Santa Clara River Valley in the dark. It drowned people in their beds.
It swept away labor camps before anyone inside them had time to understand what the sound was. The confirmed death toll is given as more than four hundred thirty-one, but historians have noted for decades that the actual number is unknowable, because a significant portion of the dead were Mexican and Filipino farmworkers living in seasonal labor camps whose existence was not recorded in any census, any employment file, or any county register. The coroner's jury acknowledged this gap in its own record.
The men and women in those camps left no paper trail into the disaster and none out of it. It was the worst civil-engineering catastrophe in the history of the United States. Mulholland appeared before the coroner's jury.
He did not deflect or qualify. He accepted full responsibility. He never practiced engineering again.
He died seven years later, still in Los Angeles, the city he had made possible and then nearly destroyed. The aqueduct system he built still runs through this same corridor. The water that fills your glass in Los Angeles or the Central Valley travels through the same mountain range that swallowed his dam.
The canyon is a California Historical Landmark, and in twenty nineteen Congress established the Saint Francis Dam Disaster National Monument there.
