Significant Hazard Dams

No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.

Dam Name	Hazard	Height	Built	Type	State
Ansonia Sewage Lagoon I Darke	Significant Hazard	12 ft	1970	Earth	Ohio
Antelope Creek Bonneville	Significant Hazard	22 ft	1991	—	Idaho
Anthon Subwatershed 1-2261 Woodbury	Significant Hazard	28 ft	1954	Earth	Iowa
Anthonys Mill Berks	Significant Hazard	15 ft	1927	Arch	Pennsylvania
Antrim Sewage Lagoons Dam Hillsborough	Significant Hazard	13 ft	1978	Earth	New Hampshire
Aowa Creek 1-3 Dixon	Significant Hazard	38 ft	1981	Earth	Nebraska
Aowa Creek 22-3 Dixon	Significant Hazard	45 ft	1981	Earth	Nebraska
Aowa Creek 31-20a Dixon	Significant Hazard	51 ft	2003	Earth	Nebraska
Apodaca Arroyo Dam Doña Ana	Significant Hazard	33 ft	1962	Earth	New Mexico
A-Point Refuse Facility	Significant Hazard	—	—	—	West Virginia
A-Point Slurry Cells	Significant Hazard	—	—	—	West Virginia
Appalachian Lake Preston	Significant Hazard	15 ft	—	Earth	West Virginia
Appalachian Wildlife Area Pond Mb-165 Dam Morgan	Significant Hazard	31 ft	1959	Earth	Ohio
Apple Dam Alamance	Significant Hazard	—	—	Earth	North Carolina
Apple Mountain Lake Dam Warren	Significant Hazard	33 ft	—	Earth	Virginia
Apple Mountain Upper Lake Dam Warren	Significant Hazard	35 ft	—	Earth	Virginia
Appleseed Ridge Lake No. 1 Dam Logan	Significant Hazard	43 ft	1968	Earth	Ohio
Apshawa Auxiliary Dam Passaic	Significant Hazard	16 ft	—	Concrete	New Jersey
Apshawa Main Dam Passaic	Significant Hazard	22 ft	1912	Concrete	New Jersey
Aps Lined Ash Impoundment San Juan	Significant Hazard	40 ft	2003	Earth	New Mexico
Aps Lined Decant Water Pond San Juan	Significant Hazard	86 ft	2003	Earth	New Mexico
Apthorp Grafton	Significant Hazard	24 ft	1936	Concrete	New Hampshire
Aqua Pond Dam Windham	Significant Hazard	11 ft	—	Earth	Connecticut
Aquarena Dam Hays	Significant Hazard	7 ft	1849	Rockfill	Texas
Aquilla Hackberry Ck WS SCS Gss 105 Hill	Significant Hazard	15 ft	1976	Earth	Texas
Aquilla Hackberry Ck WS SCS Gss 106 Hill	Significant Hazard	19 ft	1977	Earth	Texas
Aquilla Hackberry Ck WS SCS Site 15 Dam Hill	Significant Hazard	36 ft	1978	Earth	Texas
Aquilla-Hackberry Ck WS SCS Site 19a Dam Hill	Significant Hazard	30 ft	1980	Earth	Texas
Aquilla Hackberry Ck WS SCS Site 7 Dam Hill	Significant Hazard	30 ft	1979	Earth	Texas
Arapahoe Lake Arapahoe	Significant Hazard	20 ft	1974	Earth	Colorado
Arcola Center Dam Loudoun	Significant Hazard	—	—	Earth	Virginia
Arenas Dam St. Clair	Significant Hazard	20 ft	1950	Earth	Illinois
Arens Lake Dam Morgan	Significant Hazard	16 ft	1978	Earth	Indiana
Argenta Tailings Dam Lander	Significant Hazard	36 ft	1991	Earth	Nevada
Argentine Dam Genesee	Significant Hazard	17 ft	1929	Earth	Michigan
Argyle Business Park Dam Denton	Significant Hazard	12 ft	2021	—	Texas
Argyle Lake Dam McDonough	Significant Hazard	58 ft	1949	Earth	Illinois
Arivaca Pima	Significant Hazard	30 ft	1970	Earth	Arizona
Arkansas Pond Lake	Significant Hazard	5 ft	—	Earth	Colorado
Arkla Lake Dam Miller	Significant Hazard	16 ft	1958	Earth	Arkansas
Arling Saunders Pond Dam Allegany	Significant Hazard	13 ft	1954	Earth	New York
Arlington Detention Ramsey	Significant Hazard	10 ft	1989	Earth	Minnesota
Arlington Mill Res Evergreen Dike Rockingham	Significant Hazard	31 ft	1922	Earth	New Hampshire
Armadillo Drive Lake Dam Walker	Significant Hazard	13 ft	—	Earth	Texas
Armington Lake Dam Grafton	Significant Hazard	9 ft	1900	Concrete	New Hampshire
Armitage Pond Dam Windham	Significant Hazard	4 ft	—	Earth	Connecticut
Armourdale Dam Towner	Significant Hazard	46 ft	1961	Earth	North Dakota
Armstrong Dam Cherokee	Significant Hazard	—	—	Earth	North Carolina
Armstrong Park Pond Dam Fairfield	Significant Hazard	16 ft	—	Earth	Connecticut
Arnett Lake No. 1 Dam Warren	Significant Hazard	26 ft	1967	Earth	Ohio