High Hazard Dams

Loss of human life is likely if the dam fails.

Dam Name	Hazard	Height	Built	Type	State
Twin Lakes No 1 Dam Denton	High Hazard	11 ft	1970	Earth	Texas
Twin Lakes No 2 Westmoreland	High Hazard	34 ft	1910	Earth	Pennsylvania
Twin Lakes No 2 Dam Denton	High Hazard	12 ft	1970	Earth	Texas
Twin Lakes North Franklin	High Hazard	32 ft	1920	—	Idaho
Twin Lakes (Salt Lake) Salt Lake	High Hazard	—	1914	Gravity	Utah
Twin Lakes South Franklin	High Hazard	36 ft	1920	—	Idaho
Twin Lakes West Oklahoma	High Hazard	20 ft	1930	Earth	Oklahoma
Twin Oak Dam Robertson	High Hazard	54 ft	1982	Earth	Texas
Twin Odessa Terminal Storage Reservoir Ector	High Hazard	25 ft	1954	Earth	Texas
Twin Parks 7 Iowa	High Hazard	38 ft	1963	Earth	Wisconsin
Twin Pines Country Club Lake Dam Cass	High Hazard	25 ft	1969	Earth	Missouri
Twin Pots Duchesne	High Hazard	—	1931	Earth	Utah
Twin Reservoirs Kauai	High Hazard	49 ft	1920	Earth	Hawaii
Twin-Rush Creek Dam No. 1 Washington	High Hazard	50 ft	1980	Earth	Indiana
Twin-Rush Creek Dam No. 2 Washington	High Hazard	65 ft	1969	Earth	Indiana
Twin-Rush Creek Dam No. 3 Washington	High Hazard	74 ft	1969	Earth	Indiana
Twin (Turtle) Lake Lake	High Hazard	—	1932	Earth	Montana
Twitchell Santa Barbara	High Hazard	241 ft	1958	Earth	California
Twitty Dam Union	High Hazard	—	1973	Earth	North Carolina
Two Buttes Baca	High Hazard	96 ft	1908	Earth	Colorado
Two Lick Creek Indiana	High Hazard	90 ft	1968	Earth	Pennsylvania
Two Mile Run Venango	High Hazard	85 ft	1971	Earth	Pennsylvania
Two Rivers Davidson	High Hazard	—	1971	Earth	Tennessee
Two Rivers Diamond A Dam Chaves	High Hazard	98 ft	1963	Earth	New Mexico
Tycoon Lake Dam Gallia	High Hazard	29 ft	1961	Earth	Ohio
Tygart Dam Taylor	High Hazard	—	1938	Gravity	West Virginia
Tyler Dam Middlesex	High Hazard	34 ft	1980	Earth	Massachusetts
Tynecastle Dam Avery	High Hazard	—	1971	Earth	North Carolina
Tyner Lake Dam Jackson	High Hazard	64 ft	1969	Earth	Kentucky
Tyrol Lake Dam Warren	High Hazard	47 ft	—	Earth	Missouri
Tyrone Power Company Dam Schuyler	High Hazard	20 ft	1953	Concrete	New York
Tyrone Reservoir #2 Blair	High Hazard	51 ft	1912	Earth	Pennsylvania
Tyson Fresh Meats Storage Pond 4 Walla Walla	High Hazard	—	1993	Earth	Washington
Tyson Proteins Oxidation Pond Dam Forsyth	High Hazard	55 ft	1960	Earth	Georgia
Tywappity Community Lake Dam Scott	High Hazard	36 ft	1957	Earth	Missouri
Udeys Columbia	High Hazard	14 ft	1917	Gravity	Wisconsin
Uhlmann Lake Dam Cass	High Hazard	25 ft	1977	Earth	Missouri
Ukumehame Reservoirs Maui	High Hazard	29 ft	—	Earth	Hawaii
Ulbrich Reservoir Dam New Haven	High Hazard	17 ft	1966	Earth	Connecticut
Umbarger Dam Randall	High Hazard	43 ft	1938	Earth	Texas
Umbc Dam Baltimore	High Hazard	38 ft	1976	Earth	Maryland
Uncanoonuc Lake Dam Hillsborough	High Hazard	10 ft	1936	Earth	New Hampshire
Uncanoonuc Lake Dike Hillsborough	High Hazard	15 ft	1954	Earth	New Hampshire
Underwood Dam Wake	High Hazard	—	—	Earth	North Carolina
Underwood Pond Dam Wake	High Hazard	—	—	Earth	North Carolina
Unicoi State Park Lake Dam White	High Hazard	75 ft	1955	Earth	Georgia
Unicorn Lake Dam Denton	High Hazard	13 ft	1917	Earth	Texas
Unimin Fresh Water Dam Frederick	High Hazard	46 ft	—	Earth	Virginia
Unimin Tailings Dam Frederick	High Hazard	96 ft	—	Earth	Virginia
Union City Dam Erie	High Hazard	—	1971	Earth	Pennsylvania