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
Arnett Lake No. 2 Dam Warren	Significant Hazard	13 ft	1967	Earth	Ohio
Arnold-Armstrong Subwtrshd Gully 23 Monona	Significant Hazard	36 ft	1961	Earth	Iowa
Arnold Brook Aroostook	Significant Hazard	21 ft	1971	Earth	Maine
Arnold Dam Berkshire	Significant Hazard	21 ft	1954	Masonry	Massachusetts
Arnold Lake Dam Monroe	Significant Hazard	26 ft	—	Earth	Indiana
Arnolds Lake Dam Lee	Significant Hazard	—	—	Earth	North Carolina
Arnoname 136 Garland	Significant Hazard	—	1962	Earth	Arkansas
Arnoname 27 Hot Spring	Significant Hazard	—	1953	Earth	Arkansas
Arnoname 4 Dougherty's Dam Lonoke	Significant Hazard	18 ft	1942	Earth	Arkansas
Arrigoni Pond Dam Middlesex	Significant Hazard	21 ft	1945	Earth	Connecticut
Arrowhead Lake Dam Aiken	Significant Hazard	40 ft	1955	—	South Carolina
Arrowhead Lake Dam Barber	Significant Hazard	40 ft	—	Earth	Kansas
Arrowhead Lake Dam Williamson	Significant Hazard	16 ft	1963	Earth	Illinois
Arrowhead Lake Dam No. 1 Mahoning	Significant Hazard	30 ft	1952	Earth	Ohio
Arrowhead Lake Pond Dam Cumberland	Significant Hazard	15 ft	1972	Earth	New Jersey
Arrowhead Reservoir Lemhi	Significant Hazard	20 ft	1975	—	Idaho
Artesia Wastewater Re-Use Irrigation Pond 1 Eddy	Significant Hazard	12 ft	2006	Earth	New Mexico
Arther Dengel #1 Fergus	Significant Hazard	24 ft	1948	Earth	Montana
Arthun Dam Park	Significant Hazard	23 ft	1956	Earth	Montana
Arthur Flick Dam Steuben	Significant Hazard	12 ft	1976	Earth	New York
Arthur J Bousquet Dam Hampshire	Significant Hazard	7 ft	—	Earth	Massachusetts
Arthur V. Ormond Lock and Dam Conway	Significant Hazard	28 ft	1969	Concrete	Arkansas
Artistic Wire Company Pond Dam Middlesex	Significant Hazard	12 ft	—	Earth	Connecticut
Asarco 82 Gila	Significant Hazard	48 ft	1983	Earth	Arizona
Ascalmore WS Str Y-17a-71 Dam Tallahatchie	Significant Hazard	34 ft	1963	Earth	Mississippi
Ashbury Park Lake Dam Morgan	Significant Hazard	14 ft	—	Earth	Indiana
Ashby Reservoir Dam Middlesex	Significant Hazard	28 ft	1918	Concrete	Massachusetts
Ashe Pond Dam	Significant Hazard	7 ft	—	Earth	Connecticut
Asher Dam Dutchess	Significant Hazard	12 ft	1890	Masonry	New York
Ashford Lake Dam Windham	Significant Hazard	23 ft	1949	Earth	Connecticut
Ashland Oil Refinery Lake Dam Boyd	Significant Hazard	42 ft	1959	Earth	Kentucky
Ashland Sewage Lagoon Dam Grafton	Significant Hazard	15 ft	1968	Earth	New Hampshire
Ashley Lake Dam Knox	Significant Hazard	25 ft	1971	Earth	Ohio
Ashley Pond Dam Hampden	Significant Hazard	11 ft	1897	Earth	Massachusetts
Ashley Twin Lakes Uintah	Significant Hazard	—	1920	Earth	Utah
Ashley Waterworks Reservoir Delaware	Significant Hazard	12 ft	1954	Earth	Ohio
Ashton Community Pond Dam Montgomery	Significant Hazard	22 ft	1959	Earth	Maryland
Ashville Pond Washington	Significant Hazard	9 ft	1885	Rockfill	Rhode Island
Ashworth Dam Worcester	Significant Hazard	10 ft	—	—	Massachusetts
Asnacomet Pond Dam Worcester	Significant Hazard	9 ft	—	Earth	Massachusetts
Aspen Lake Iron	Significant Hazard	—	—	Earth	Utah
Aspen Lodge Larimer	Significant Hazard	16 ft	—	Earth	Colorado
Aspetuck Reservoir Dam Fairfield	Significant Hazard	11 ft	1913	Earth	Connecticut
Aspetuck River Dam Fairfield	Significant Hazard	12 ft	—	—	Connecticut
Assabet Middlesex	Significant Hazard	13 ft	1921	Masonry	Massachusetts
Assabet River Dam Worcester	Significant Hazard	11 ft	—	Concrete	Massachusetts
Associated Electric Pi 2-59 Chariton	Significant Hazard	—	—	—	Missouri
Associated Electric Pi 2-61 Chariton	Significant Hazard	—	—	—	Missouri
Asso.Minerals (Usa) Ltd. Dam Clay	Significant Hazard	20 ft	1970	Earth	Florida
Assunpink #19 Dam Monmouth	Significant Hazard	36 ft	—	Earth	New Jersey