St. Francis Dam Disaster Site

St. Francis Dam Disaster Site (HM2KNW)

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N 34° 32.814', W 118° 30.867'

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On this site in August of 1924 construction started on the St. Francis Dam, a unit of the Los Angeles Aqueduct. When it was completed in May of 1926, this concrete dam stood 185 feet above the stream bed, impounding a 610 surface-acre lake.

At 11:57 1/2 P.M. March 12, 1928, the dam collapsed causing the second greatest disaster in the state of California. At least 425 lives were lost in the 3 1/2 hours that it took the released water to travel 54 miles down the Santa Clara River Valley to the sea at Ventura.

This plaque placed by Santa Clarita Valley Historical Society March 12, 1978
(State Historical Status Pending)
Year Placed1978
Placed BySanta Clarita Valley Historical Society
Marker ConditionNo reports yet
Date Added Tuesday, September 10th, 2019 at 8:02pm PDT -07:00
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Locationbig map
UTM (WGS84 Datum)11S E 361040 N 3823839
Decimal Degrees34.54690000, -118.51445000
Degrees and Decimal MinutesN 34° 32.814', W 118° 30.867'
Degrees, Minutes and Seconds34° 32' 48.84" N, 118° 30' 52.02" W
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