Largest Reservoirs in California

California has 1371 dams with recorded storage capacity. The largest is Shasta Dam with 4,661,860 acre-feet of maximum storage. One acre-foot equals about 326,000 gallons — enough to supply roughly two households for a year.

#	Dam	County	Max Storage (acre-ft)	Height (ft)	Purpose	Year
1	Shasta Dam	Shasta	4,661,860	602	Hydroelectric	1945
2	Oroville	Butte	3,540,000	770	Flood Risk Reduction	1968
3	New Melones Dam	Calaveras	2,870,000	625	Hydroelectric	1979
4	Trinity Dam	Trinity	2,760,870	538	Hydroelectric	1962
5	Don Pedro Dike A	Tuolumne	2,300,000	25	Hydroelectric	1971
6	B.f. Sisk Dike	Merced	2,063,510	30	Hydroelectric	1967
7	Monticello Dam	Napa	1,902,086	304	Irrigation	1957
8	Prado Dam - California Institute For Women Dike	San Bernardino	1,289,000	32	Flood Risk Reduction	2017
9	Isabella Dam	Kern	1,202,000	185	Flood Risk Reduction	1953
10	Lake Almanor	Plumas	1,142,964	135	Hydroelectric	1927
11	Exchequer Dike	Mariposa	1,100,000	97	Hydroelectric	1966
12	Pine Flat Dam	Fresno	1,091,700	440	Flood Risk Reduction	1954
13	New Bullards Bar	Yuba	1,010,000	645	Hydroelectric	1970
14	Folsom Dike 7	Sacramento	976,955	38	Flood Risk Reduction	1956
15	Diamond Valley Lake	Riverside	800,000	284	Water Supply	2000
16	Lake Tahoe Dam	Placer	732,000	18	Irrigation	1913
17	Clear Lake Dike 1	Modoc	597,500	13	Irrigation	1910
18	Friant Dike 3	Fresno	555,500	23	Flood Risk Reduction	1942
19	Nacimiento	San Luis Obispo	470,000	255	Hydroelectric	1956
20	Warm Springs Dam	Sonoma	449,000	356	Flood Risk Reduction	1983
21	Camanche Dike No. 1	Calaveras	417,000	90	Water Supply
22	Twitchell Dam	Santa Barbara	398,120	241	Flood Risk Reduction	1958
23	Clear Lake	Lake	378,000	43	Irrigation	1914
24	O`shaughnessy	Tuolumne	360,000	312	Water Supply	1923
25	Indian Valley	Lake	359,000	225	Irrigation	1975
26	Black Butte Dam - Dike 6	Tehama	354,000	7	Flood Risk Reduction	1963
27	San Antonio	Monterey	350,000	202	Flood Risk Reduction	1965
28	New Hogan Dam	Calaveras	348,598	210	Flood Risk Reduction	1963
29	Stampede Dam	Sierra	339,100	239	Irrigation	1970
30	Castaic	Los Angeles	323,700	340	Water Supply	1973
31	Casitas Saddle Dike	Ventura	287,000	43	Irrigation	1959
32	Whiskeytown Dike 2	Shasta	276,117	70	Hydroelectric	1963
33	Cherry Valley	Tuolumne	273,500	315	Other	1956
34	Union Valley	El Dorado	266,369	455	Hydroelectric	1962
35	San Vicente	San Diego	245,000	338	Other	1943
36	Hell Hole	Placer	207,000	410	Irrigation	1966
37	Bradbury Dam	Santa Barbara	206,900	279	Irrigation	1953
38	Pardee	Calaveras	198,000	352	Water Supply	1929
39	New Spicer Meadow	Tuolumne	193,000	265	Hydroelectric	1989
40	Buchanan Dam	Madera	185,256	219	Flood Risk Reduction	1975
41	Long Valley	Mono	183,465	126	Water Supply	1941
42	Mathews	Riverside	182,000	264	Water Supply	1938
43	Mojave River Dam - Saddle Dike 1	San Bernardino	179,400	200	Flood Risk Reduction	1971
44	Pyramid	Los Angeles	171,000	422	Water Supply	1974
45	Los Vaqueros	Contra Costa	160,000	231	Water Supply	1997
46	Imperial Diversion Dam	Imperial	160,000	85	Irrigation	1938
47	Coyote Valley Dam	Mendocino	155,500	180	Flood Risk Reduction	1959
48	Seven Oaks	San Bernardino	145,600	550	Flood Risk Reduction	1999
49	Salt Springs	Calaveras	141,857	328	Hydroelectric	1931
50	Vermilion Valley	Fresno	140,000	165	Hydroelectric	1954

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