High Risk Dams in Colorado

Colorado has 37 high hazard dams with a condition assessment of poor or unsatisfactory. These are dams where failure would probably cause loss of human life and where recognized safety deficiencies have been identified.

Of the 451 high hazard dams in Colorado, 37 (8%) have concerning condition ratings — 0 rated poor and 37 rated unsatisfactory.

Dam	County	Height (ft)	Condition	Purpose	Year
Sanchez	Costilla	137	Unsatisfactory	Irrigation	1911
Narraguinnep - Main Dam	Montezuma	114	Unsatisfactory	Irrigation	1908
Stillwater #1	Garfield	89	Unsatisfactory	Irrigation	1939
Miramonte	San Miguel	87	Unsatisfactory	Recreation	1978
Spring Creek	Gunnison	76	Unsatisfactory	Recreation	1961
Sheriff	Rio Blanco	72	Unsatisfactory	Irrigation	1955
Goose Pasture Tarn	Summit	71	Unsatisfactory	Recreation	1965
Tarryall	Park	70	Unsatisfactory	Recreation	1929
Julesburg #2	Sedgwick	67	Unsatisfactory	Irrigation	1910
Little King Ranch	Grand	65	Unsatisfactory	Recreation	1968
Grass Valley	Garfield	61	Unsatisfactory	Irrigation	1892
Vouga	Saguache	60	Unsatisfactory	Irrigation	1978
Beckwith	Pueblo	60	Unsatisfactory	Irrigation	1911
Rito Hondo	Hinsdale	50	Unsatisfactory	Recreation	1956
Penrose	El Paso	50	Unsatisfactory	Irrigation	1917
Valley No. 2	El Paso	48	Unsatisfactory	Recreation	1906
Upper Long Lake	Jefferson	46	Unsatisfactory	Water Supply	1939
Julesburg #3	Sedgwick	43	Unsatisfactory	Irrigation	1910
Prewitt	Washington	43	Unsatisfactory	Irrigation	1912
Summit - Main Dam	Montezuma	42	Unsatisfactory	Irrigation	1905
Flagler	Kit Carson	41	Unsatisfactory	Recreation	1965
Apishapa	Las Animas	41	Unsatisfactory	Fish and Wildlife Pond	1892
Smith	Jefferson	40	Unsatisfactory	Irrigation	1908
Valley No. 1	El Paso	40	Unsatisfactory	Recreation	1901
Skeel	Denver	40	Unsatisfactory	Recreation	1900
Y T Ranch	Mesa	35	Unsatisfactory	Recreation	1911
Julesburg #4	Sedgwick	34	Unsatisfactory	Irrigation	1910
Daigre	Huerfano	32	Unsatisfactory	Water Supply	1907
Leon Lake	Mesa	30	Unsatisfactory	Irrigation	1898
Polly A. Deane	Jefferson	28	Unsatisfactory	Irrigation	1908
Hyatt	Jefferson	24	Unsatisfactory	Irrigation	1863
Windsor	Denver	24	Unsatisfactory	Irrigation	1892
Julesburg #1	Logan	23	Unsatisfactory	Irrigation	1910
Offield	Moffat	22	Unsatisfactory	Fire Protection, Stock, Or Small Fish Pond	1914
Lower Long Lake	Jefferson	19	Unsatisfactory	Water Supply	1939
Julesburg #1a	Logan	18	Unsatisfactory	Irrigation	1910
Summit - South Dam	Montezuma	10	Unsatisfactory	Irrigation	1937

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