Largest Reservoirs in Arizona

Arizona has 299 dams with recorded storage capacity. The largest is Glen Canyon Dam with 25,025,826 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	Glen Canyon Dam	Coconino	25,025,826	710	Hydroelectric	1963
2	Painted Rock Dam - Saddle Dike 1	Maricopa	4,831,500	181	Flood Risk Reduction	1960
3	Theodore Roosevelt Dam	Maricopa	3,432,408	357	Hydroelectric	1911
4	Davis Dam	Mohave	1,592,300	200	Hydroelectric	1950
5	Alamo Dam	Mohave	1,409,000	283	Flood Risk Reduction	1968
6	Coolidge	Gila	1,356,337	250	Irrigation	1931
7	New Waddell Dam	Maricopa	1,063,163	440	Flood Risk Reduction	1992
8	Sierrita	Pima	995,063	350	Tailings
9	Number 7	Pima	306,000	189	Tailings
10	Horse Mesa Dam	Maricopa	261,335	305	Hydroelectric	1927
11	Bartlett Dam	Maricopa	249,693	309	Water Supply	1939
12	Horseshoe Dam	Maricopa	214,372	202	Irrigation	1946
13	Parker Dam	La Paz	180,000	320	Hydroelectric	1938
14	Ab-bc	Pinal	180,000	150	Tailings
15	Cave Buttes	Maricopa	122,000	118	Flood Risk Reduction	1980
16	New River Dam - Dike No. 1	Maricopa	102,520	36	Flood Risk Reduction	1986
17	4 West	Graham	93,275	226	Tailings
18	Tat Momolikot - Cemetery Dike	Pinal	84,535	9	Flood Risk Reduction	1974
19	Stewart Mountain Dam	Maricopa	70,070	210	Hydroelectric	1930
20	Whitlow Ranch Dam - Saddle Dike 1	Pinal	64,910	149	Flood Risk Reduction	1959
21	D Tailings	Pinal	63,000	150	Tailings
22	Schoens	Navajo	62,000	118	Flood Risk Reduction	1988
23	Adobe	Maricopa	61,000	89	Flood Risk Reduction	1982
24	Mormon Flat Dam	Maricopa	57,852	224	Hydroelectric	1926
25	Lyman Dam	Apache	44,500	60	Irrigation	1912
26	Many Farms Dike A	Apache	36,658	29	Irrigation	1943
27	Headgate Rock	La Paz	29,485	70	Irrigation	1941
28	3 West	Graham	28,860	307	Tailings
29	Buckeye Frs #1	Maricopa	25,500	49	Flood Risk Reduction	1974
30	Mcmicken	Maricopa	23,800	35	Flood Risk Reduction	1956
31	Lower Lake Mary	Coconino	22,400	33	Water Supply	1907
32	Upper Lake Mary	Coconino	21,041	49	Recreation	1941
33	Sunrise	Apache	19,713	58	Recreation	1967
34	2 West	Graham	19,600	125	Tailings
35	C.c. Cragin Dam	Coconino	19,500	170	Hydroelectric	1964
36	Reach 11 Detention Dike 1	Maricopa	19,500	35		1977
37	Magma Retarding	Pinal	18,684	23	Flood Risk Reduction	1964
38	Cholla Fly Ash Pond	Navajo	18,000	80	Other	1978
39	Lone Pine	Navajo	14,700	98	Flood Risk Reduction	1936
40	Cave Creek	Maricopa	14,000	120	Flood Risk Reduction	1923
41	Daggs	Navajo	13,750	57	Irrigation	1919
42	Picacho Dam	Pinal	13,730	33		1889
43	1 West	Graham	13,137	400	Tailings
44	Elgo	Graham	13,100	133	Recreation	1979
45	Number 4	Pima	12,730	40	Tailings
46	Stockton Wash Retarding	Graham	12,400	48	Flood Risk Reduction	1964
47	Florence Retarding	Pinal	11,100	21	Flood Risk Reduction	1965
48	Big Lake	Apache	10,100	32	Recreation	1964
49	Menager's	Pima	9,635	30	Flood Risk Reduction	1927
50	Chevelon Canyon	Coconino	8,542	84	Fish and Wildlife Pond	1966

← All dams in Arizona · Largest reservoirs nationwide