Dams in Los Angeles County, California

103Total Dams

81High Hazard

6Significant

Dam Safety in Los Angeles County, California

Los Angeles County has 103 dams tracked in the National Inventory of Dams. Of these, 81 are classified as high hazard — meaning failure would probably cause loss of human life. Another 6 carry a significant hazard classification. Currently, 3 dams have a condition assessment of poor or unsatisfactory.

The average dam in Los Angeles County is 77 years old. The most common purpose is water supply. The tallest dam is Pyramid at 422 ft.

Explore more: Oldest dams in California · Tallest dams · High risk dams · Largest reservoirs

Dam	Hazard	Condition	Height (ft)	Purpose	Year
Pyramid	High	Fair	422	Water Supply	1974
San Gabriel	High	Satisfactory	381	Hydroelectric	1937
Pacoima	High	Satisfactory	365	Flood Risk Reduction	1929
Castaic	High	Poor	340	Water Supply	1973
Cogswell	High	Satisfactory	266	Flood Risk Reduction	1935
Morris	High	Satisfactory	245	Other	1935
Big Santa Anita	High	Satisfactory	225	Flood Risk Reduction	1927
Big Tujunga No. 1	High	Satisfactory	220	Flood Risk Reduction	1931
Mulholland	High	Satisfactory	195	Water Supply	1924
Bouquet Canyon	High	Fair	190	Water Supply	1934
Stone Canyon	High	Satisfactory	188	Water Supply	1924
Encino	High	Satisfactory	168	Water Supply	1924
Garvey Reservoir	High	Satisfactory	160	Water Supply	1954
Westlake Reservoir	High	Satisfactory	158	Water Supply	1972
Santa Ynez Canyon	High	Satisfactory	157	Other	1968
Big Dalton	High	Satisfactory	153	Flood Risk Reduction	1929
Sawpit	High	Satisfactory	150	Flood Risk Reduction	1927
Puddingstone	High	Satisfactory	147	Flood Risk Reduction	1928
San Dimas	High	Satisfactory	131	Flood Risk Reduction	1922
Los Angeles Reservoir	High	Satisfactory	130	Other	1977
Ler San Fernando	High	Satisfactory	125	Water Supply	1918
Littlerock	High	Satisfactory	124	Other	1924
Fairmont	High	Satisfactory	121	Flood Risk Reduction	1912
Green Verdugo	High	Satisfactory	118	Water Supply	1953
Eagle Rock	High	Fair	113	Other	1953
Devils Gate	High	Satisfactory	108	Flood Risk Reduction	1920
Live Oak Reservoir	High	Satisfactory	105	Water Supply	1975
Ler Franklin	High	Satisfactory	103	Flood Risk Reduction	1922
Brand Park	High	Satisfactory	99	Water Supply	1930
Hansen Dam	High	Not Available	97	Flood Risk Reduction	1940
Santa Fe Dam	High	Not Available	92	Flood Risk Reduction	1949
Chevy Chase 1290 Reservoir	High	Satisfactory	90	Water Supply	1940
Ler Sunset Debris Basin	High	Satisfactory	86	Debris Control	1963
Sawpit Debris Basin	High	Fair	82	Debris Control	1955
Palos Verdes Reservoir	High	Satisfactory	82	Water Supply	1939
Silt Pond	High	Not Available	80	Other
Live Oak	High	Satisfactory	76	Flood Risk Reduction	1922
Greystone Reservoir	High	Satisfactory	75	Water Supply	1970
Elysian	High	Satisfactory	71	Water Supply	1943
Little Dalton Debris Basin	High	Satisfactory	71	Debris Control	1960
Haines Canyon Debris Dam	High	Not Available	70	Debris Control	1938
Sierra Madre	High	Satisfactory	69	Debris Control	1928
Dry Canyon	High	Satisfactory	66	Flood Risk Reduction	1912
Thompson Creek	High	Satisfactory	66	Flood Risk Reduction	1928
Amargosa Creek	High	Satisfactory	65	Flood Risk Reduction	1998
Rubio Debris Basin	High	Poor	64	Debris Control	1944
Eaton Wash Debris Basin	High	Satisfactory	63	Debris Control	1936
Glenoaks 968 Reservoir	High	Satisfactory	62	Water Supply	1949
Diederich Reservoir	High	Satisfactory	60	Water Supply	1950
Big Dalton Debris Basin	High	Satisfactory	59	Debris Control	1960
Sepulveda Dam	High	Not Available	57	Flood Risk Reduction	1941
Whittier Narrows Dam	High	Not Available	56	Flood Risk Reduction	1957
Stevenson Ranch	High	Satisfactory	54	Debris Control	2004
Sierra Madre Villa	High	Satisfactory	50	Debris Control	1958
Blanchard Debris Basin	High	Satisfactory	50	Debris Control	1966
Wilson Debris Basin	High	Satisfactory	50	Debris Control	1961
Quail	High	Satisfactory	50	Water Supply	1981
Lopez Dam	High	Not Available	50	Debris Control	1954
Morris S. Jones	High	Satisfactory	49	Water Supply	1952
La Tuna Debris Basin	High	Satisfactory	47	Debris Control	1960
Stough Debris Basin	High	Satisfactory	46	Debris Control	1961
Chatsworth	High	Satisfactory	45	Water Supply	1918
Brand Debris Basin	High	Satisfactory	45	Debris Control	1965
Malibou Lake Club	High	Satisfactory	44	Water Supply	1923
Silver Lake	High	Satisfactory	43	Water Supply	1976
Bailey Debris Basin	High	Satisfactory	43	Debris Control	1954
Fresh Water	High	Not Available	40	Water Supply
10 Mg Walteria	High	Satisfactory	40	Water Supply	1953
Riviera Reservoir	High	Satisfactory	40	Water Supply	1962
Potrero	High	Satisfactory	40	Other	1967
Reservoir No. 4	High	Satisfactory	38	Water Supply	1955
Schoolhouse Debris Basin	High	Satisfactory	38	Debris Control	1962
Morgan Debris Basin	High	Satisfactory	37	Debris Control	1962
Reservoir No. 5	High	Satisfactory	36	Water Supply	1949
Puddingstone Diversion	High	Satisfactory	34	Other	1928
18 Mg Walteria	High	Satisfactory	31	Water Supply	1987
Fresh Water	High	Not Available	30	Water Supply
Harold Reservoir	High	Satisfactory	30	Water Supply	1891
Rocky Oaks Dam	High	Not Available	22	Fish and Wildlife Pond
East Glorietta	High	Satisfactory	22	Water Supply	1932
Weymouth Memorial Reservoir	High	Satisfactory	18	Water Supply	1966
Thompson	Significant	Satisfactory	114	Water Supply	1925
Drinkwater	Significant	Satisfactory	105	Other	1923
Century	Significant	Poor	44	Water Supply	1913
Laguna Regulating Basin	Significant	Satisfactory	43	Flood Risk Reduction	1970
Wrigley Reservoir	Significant	Satisfactory	42	Water Supply	1930
Upper Franklin Dam	Significant	Not Available	40	Flood Risk Reduction	1915
Elderberry Forebay	Low	Satisfactory	200	Water Supply	1972
Upper Stone Canyon	Low	Satisfactory	111	Water Supply	1954
Upper Hollywood	Low	Satisfactory	87	Other	1933
Upper San Fernando	Low	Satisfactory	82	Other	1921
Ler Van Norman Bypass	Low	Satisfactory	78	Other	1970
Santa Anita Debris Basin	Low	Fair	56	Debris Control	1960
Whittier Reservoir No. 4	Low	Satisfactory	55	Water Supply	1931
J. W. Wisda	Low	Satisfactory	50	Recreation	1958
Hansen Recreational Lake	Low	Satisfactory	50	Water Supply	1999
Ler Franklin No. 2	Low	Satisfactory	49	Water Supply	1982
Channel Diversion Dike	Low	Satisfactory	42	Flood Risk Reduction	1940
Yarnell Debris Basin	Low	Satisfactory	42	Debris Control	1963
Headworks Reservoir East	Low	Satisfactory	32	Water Supply	2016
Headworks Reservoir West	Low	Satisfactory	32	Water Supply	2022
Fairmont No. 2	Low	Satisfactory	24	Other	1982
Lindero	Low	Satisfactory	19	Water Supply	1966

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