High Hazard Dams

Loss of human life is likely if the dam fails.

Dam Name	Hazard	Height	Built	Type	State
Upper Gila Valley Site No. 3 Dam Grant	High Hazard	27 ft	1962	Earth	New Mexico
Upper Gila Valley Site No. 4 Dam Grant	High Hazard	31 ft	1962	Earth	New Mexico
Upper Gila Valley Site No. 6 Dam Grant	High Hazard	32 ft	1963	Earth	New Mexico
Upper Gila Valley Site No. 7 Dam Grant	High Hazard	33 ft	1962	Earth	New Mexico
Upper Gila Valley Site No. 8 Dam Grant	High Hazard	30 ft	1963	Earth	New Mexico
Upper Gila Valley Site No. 9 Dam Grant	High Hazard	29 ft	1962	Earth	New Mexico
Upper Girard Lake Dam Trumbull	High Hazard	55 ft	1929	Earth	Ohio
Upper Glade Lake Dam Preston	High Hazard	—	—	—	West Virginia
Upper Glasston North Dam Sweet Grass	High Hazard	20 ft	1912	Earth	Montana
Upper Glasston West Dam Sweet Grass	High Hazard	22 ft	1912	Earth	Montana
Upper Golden Hills Dam Lexington	High Hazard	40 ft	—	—	South Carolina
Upper Goldwater Yavapai	High Hazard	52 ft	1932	Buttress	Arizona
Upper Grave No.1 Marshall	High Hazard	72 ft	1959	Rockfill	West Virginia
Upper Grave No.3 Marshall	High Hazard	46 ft	1958	Earth	West Virginia
Upper Grave No.4 Marshall	High Hazard	45 ft	1958	Earth	West Virginia
Upper Grave No.5 Marshall	High Hazard	53 ft	1962	Earth	West Virginia
Upper Grave No.7 Marshall	High Hazard	40 ft	1959	Earth	West Virginia
Upper Grave No.8 Marshall	High Hazard	45 ft	1959	Earth	West Virginia
Upper Grave No.9 Marshall	High Hazard	48 ft	1963	Earth	West Virginia
Upper Green Lake Green Lake	High Hazard	8 ft	1869	Gravity	Wisconsin
Upper Greenwood Lake Dam Passaic	High Hazard	20 ft	1932	Earth	New Jersey
Upper Haig Mill Lake Dam Whitfield	High Hazard	40 ft	1962	Earth	Georgia
Upper Hart Pond Dam Hartford	High Hazard	13 ft	1920	Earth	Connecticut
Upper Helemano Reservoir Honolulu	High Hazard	46 ft	1912	Earth	Hawaii
Upper Highland Lake Dam Hampshire	High Hazard	27 ft	1872	Rockfill	Massachusetts
Upper Highland Lake Dam Sussex	High Hazard	18 ft	1940	Earth	New Jersey
Upper Highline Mesa	High Hazard	87 ft	1967	Earth	Colorado
Upper Holiday Lake Dam Lee	High Hazard	—	—	Earth	North Carolina
Upper Kimball Pond Dam Carroll	High Hazard	10 ft	1800	Earth	New Hampshire
Upper Kittanning Blair	High Hazard	45 ft	1887	Earth	Pennsylvania
Upper Kohanza Lake Dam Fairfield	High Hazard	30 ft	1866	Earth	Connecticut
Upper Lake Dickson	High Hazard	—	1958	Earth	Tennessee
Upper Lake Fork Creek WS SCS Site 10a Dam Hunt	High Hazard	32 ft	1968	Earth	Texas
Upper Lake Fork Creek WS SCS Site 18 Dam Hopkins	High Hazard	30 ft	1960	Earth	Texas
Upper Lake Fork Creek WS SCS Site 1 Dam Hunt	High Hazard	35 ft	1977	Earth	Texas
Upper Larchmont Road Dam Chemung	High Hazard	25 ft	2005	Earth	New York
Upper Las Moras Creek WS SCS Site 1 Dam Kinney	High Hazard	38 ft	1964	Earth	Texas
Upper Las Moras Creek WS SCS Site 2 Dam Kinney	High Hazard	30 ft	1964	Earth	Texas
Upper Leaf River Structure 9 Dam Smith	High Hazard	34 ft	1976	Earth	Mississippi
Upper Letts Colusa	High Hazard	21 ft	1958	Earth	California
Upper Lick Branch Slurry Impoundment Pike	High Hazard	370 ft	—	Earth	Kentucky
Upper Little Black A-2 Ripley	High Hazard	60 ft	1992	Earth	Missouri
Upper Little Black A-7 Dam Ripley	High Hazard	54 ft	1984	Earth	Missouri
Upper Little Black D-2 Ripley	High Hazard	73 ft	1989	Earth	Missouri
Upper Little Black D-8 Dam Ripley	High Hazard	38 ft	1986	Earth	Missouri
Upper Little Nemaha 21 Lancaster	High Hazard	51 ft	1998	Earth	Nebraska
Upper Long Lake Jefferson	High Hazard	46 ft	1939	Earth	Colorado
Upper Loop Reservoir Chelan	High Hazard	—	2015	Earth	Washington
Upper Mill Creek Stormwater Detention Da King	High Hazard	—	1990	Earth	Washington
Upper Mill Dam Cass	High Hazard	14 ft	1970	Earth	Michigan