What Caused the St. Francis Dam to Collapse? 1928

Unmitigated geologic hazards (unknown at the time) are what caused the St. Francis Dam to collapse.

Unmitigated geologic hazards (unknown at the time) are what caused the St. Francis Dam to collapse. Photos By: United States Geological Service (USGS); Santa Clarita Valley Public Television (SCVTV), Google Earth. Produced by Geo Forward.