Remains of St. Francis Dam after its failure. Recent investigations into the disaster have revealed that the dam was built on an ancient landslide, which would have been undetectable to engineers of the 1920s. The middle section of the dam was blasted away in 1929 after a teenage boy climbing the attraction fell to his death. All that is left now is a scattering of concrete blocks and an occasional twist of metal.

When the dam broke on this day in 12 billion gallons of water gushed down the San Francisquito Canyon.

SaintFrancisDam.com | St. Francis Dam National Memorial | San Francisquito Canyon

Searchable history of the Santa Clarita Valley (Los Angeles County) in pictures and text.

Santa Clarita Valley History In Pictures | San Francisquito Canyon | St. Francis Dam

Searchable history of the Santa Clarita Valley (Los Angeles County) in pictures and text.

Woman stands in midst of the St. Francis Dam devastation, 1928 | Security Pacific National Bank Collection, Courtesy of the Los Angeles Public Library

The Flood: St. Francis Dam Disaster, William Mulholland, and the Casualties of L.

Site of the St. Francis Dam | Photo: Hadley Meares

The Flood: St. Francis Dam Disaster, William Mulholland, and the Casualties of L.

Santa Clarita, CA - St. Francis Dam | Atlas Obscura

St. Francis Dam

Francis Dam after the collapse Santa Clarita CA. Over 600 lives were lost as the dam collapsed, the very day it was deemed safe by the engineer who built it. That engineer was Mulholland -- called Mulwray in the movie "Chinatown.

Santa Paula, CA - St. Francis Dam after the catastrophic mistake

This Day in ‪ Francis Dam collapses in Los Angeles killing over 500 people. This disaster was the second largest loss of life in California’s history. It ended William Mulholland’s career.

Los Angeles Evening Express, Wednesday, March 14, 1928

Searchable history of the Santa Clarita Valley (Los Angeles County) in pictures and text.

This colorized photo shows the St. Francis Dam on its day of formal dedication in May of 1926, almost two years before the failure.

This colorized photo shows the St. Francis Dam on its day of formal dedication in May of almost two years before the failure.

St. Francis Dam Disaster Survivors of Santa Paula

Francis Dam Disaster Survivors of Santa Paula

Legacy: Ivan Dorset: Witness to the St. Francis Dam Disaster

Ivan Dorset lost family members in the St. Francis Dam Disaster of

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