High Risk Dams in Montana

Montana has 38 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 190 high hazard dams in Montana, 38 (20%) have concerning condition ratings — 30 rated poor and 8 rated unsatisfactory.

Dam	County	Height (ft)	Condition	Purpose	Year
Kootenai Dvlpmnt Impoundment Dam	Lincoln	151	Poor	Other	1980
West Fork Bitterroot (painted Rocks)	Ravalli	143	Poor	Irrigation	1940
Newlan Creek Dam	Meagher	131	Poor	Irrigation	1977
Hubbart	Flathead	130	Poor	Irrigation	1923
Willow Creek Dam	Madison	105	Poor	Irrigation	1938
Cooney	Carbon	102	Poor	Irrigation	1937
Crow	Lake	99	Poor	Irrigation	1933
Lower Willow Creek Dam	Granite	96	Poor	Irrigation	1962
Cataract Creek Dam	Madison	80	Unsatisfactory	Irrigation	1959
Petrolia	Petroleum	76	Poor	Irrigation	1951
Black Lake	Missoula	75	Unsatisfactory	Recreation	1967
Three Mile Reservoir (l.&c.)	Lewis and Clark	70	Poor	Irrigation	1926
Delmoe Lake Dam	Jefferson	60	Poor	Irrigation	1914
Tabor South	Lake	60	Poor	Recreation	1930
Powell	Powell	52	Poor	Irrigation	1981
Jocko	Missoula	51	Poor	Irrigation	1937
Martinsdale, East Dam	Wheatland	49	Poor	Irrigation	1939
Depression Detention Dam	Carbon	42	Poor	Flood Risk Reduction	1968
Black Eagle	Cascade	41	Poor	Hydroelectric	1891
Upper Dry Fork	Sanders	40	Unsatisfactory	Irrigation	1940
Cottonwood Dam (park)	Park	39	Poor	Irrigation	1953
Jordan Dam	Park	38	Poor	Irrigation	1961
Jackson (madison)	Madison	34	Poor	Irrigation	1959
Jackson Lake	Meagher	32	Unsatisfactory	Irrigation	1936
Eureka Reservoir Dam	Teton	32	Poor	Irrigation	1936
High Lake	Ravalli	30	Poor	Irrigation	1938
Lower Glasston Dam	Sweet Grass	30	Poor	Irrigation	1912
Kicking Horse	Lake	30	Unsatisfactory	Irrigation	1930
Hell Roaring	Lake	30	Unsatisfactory	Hydroelectric	1916
Storm Lake Dam	Deer Lodge	29	Poor	Irrigation	1898
Boot Lake Dam	Beaverhead	27	Poor	Irrigation	1912
Upper Glasston West Dam	Sweet Grass	22	Poor	Irrigation	1912
Bigfork Diversion Dam	Flathead	22	Poor	Hydroelectric	1910
Upper Glasston North Dam	Sweet Grass	20	Poor	Irrigation	1912
Melstone Detention Dam	Musselshell	19	Unsatisfactory	Fire Protection, Stock, Or Small Fish Pond	2003
Pear Lake Dam	Beaverhead	19	Poor	Irrigation	1904
Glen Lake	Lincoln	14	Poor	Irrigation	1950
Pablo North Dike	Lake	5	Unsatisfactory	Irrigation	1912

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