Largest Reservoirs in Colorado

Colorado has 1935 dams with recorded storage capacity. The largest is Sugar Loaf Dam with 1,833,700 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	Sugar Loaf Dam	Lake	1,833,700	162	Irrigation	1968
2	Blue Mesa Dam	Gunnison	938,469	390	Flood Risk Reduction	1966
3	John Martin Dam - Fort Lyon Protective Works	Bent	608,245	118	Flood Risk Reduction	1943
4	Granby Dam	Grand	539,760	298	Hydroelectric	1950
5	Pueblo Dam	Pueblo	489,116	245	Flood Risk Reduction	1975
6	Lemon Dam	La Plata	487,660	284	Fish and Wildlife Pond	1963
7	Mcphee Dam	Montezuma	399,200	295	Fish and Wildlife Pond	1983
8	Chatfield Dam	Douglas	355,000	148	Flood Risk Reduction	1973
9	Bonny Dam	Yuma	348,390	158	Flood Risk Reduction	1951
10	Dillon	Summit	305,000	310	Water Supply	1963
11	Dillon	Summit	305,000	310	Water Supply	1963
12	Horsetooth Dam	Larimer	170,370	158	Irrigation	1949
13	Trinidad Dam	Las Animas	164,930	203	Flood Risk Reduction	1976
14	Green Mountain Dam	Summit	161,850	309	Hydroelectric	1943
15	Ten Mile Pond #3 Dam	Summit	152,703	416	Tailings
16	Twin Lakes Dam	Lake	147,500	100	Hydroelectric	1978
17	Ridges Basin Dam	La Plata	139,809	273	Water Supply	2008
18	Sanchez	Costilla	137,850	137	Irrigation	1911
19	Vallecito Dam	La Plata	136,200	162	Fish and Wildlife Pond	1941
20	Cherry Creek Dam	Arapahoe	134,470	189	Flood Risk Reduction	1953
21	Eleven Mile Canyon	Park	128,000	151	Water Supply	1932
22	Adobe Creek	Bent	122,360	41	Irrigation	1904
23	Morrow Point Dam	Montrose	121,275	468	Hydroelectric	1968
24	Ruedi Dam	Pitkin	119,007	322	Hydroelectric	1968
25	Carter Lake Dam 2	Larimer	116,837	75	Hydroelectric	1952
26	Point Of Rocks	Logan	113,600	86	Irrigation	1948
27	Taylor Park Dam	Gunnison	111,280	206	Irrigation	1937
28	Williams Fork Main	Grand	96,800	209	Water Supply	1959
29	Ridgway Dam	Ouray	93,945	330	Flood Risk Reduction	1987
30	Antero	Park	92,651	48	Water Supply	1909
31	Riverside	Weld	91,391	41	Irrigation	1908
32	Cheesman	Jefferson	87,227	221	Water Supply	1905
33	Rueter Hess	Douglas	85,176	196	Water Supply	2012
34	Ritschard	Grand	84,639	126	Irrigation	1995
35	Spinney Mountain	Park	83,300	100	Water Supply	1982
36	Bear Creek Dam - South Embankment	Jefferson	75,000	65	Flood Risk Reduction	1979
37	Rio Grande	Hinsdale	73,800	117	Irrigation	1914
38	Robinson Tailing Pond #1dam	Summit	73,391	235	Other
39	Platoro Dike	Conejos	67,790	85	Flood Risk Reduction	1951
40	#1 Tailings Pond	Eagle	66,427	235	Tailings
41	Mayflower Pond # 5	Summit	64,300	237	Tailings
42	Jackson Lake	Morgan	60,800	39	Irrigation	1900
43	Nee-noshe	Kiowa	60,618	25	Irrigation	1896
44	Boyd Lake	Larimer	59,981	40	Fish and Wildlife Pond	1900
45	Standley Lake	Jefferson	54,740	123	Irrigation	1913
46	Prewitt	Washington	51,387	43	Irrigation	1912
47	Empire (east Embankment)	Morgan	50,900	35	Fish and Wildlife Pond	1905
48	Empire (mcintyre Dike)	Weld	50,900	35	Fish and Wildlife Pond	1905
49	Empire (nw Embankment)	Weld	50,900	35	Fish and Wildlife Pond	1905
50	Santa Maria	Mineral	49,400	102	Irrigation	1911

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