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
Allegheny River Lock and Dam 2 Allegheny	Significant Hazard	—	1934	Gravity	Pennsylvania
Allegheny River Lock and Dam 4 Allegheny	Significant Hazard	—	1927	Gravity	Pennsylvania
Allen Basin Rio Blanco	Significant Hazard	52 ft	1956	Earth	Colorado
Allen Correctional Center Dam Wwtp Allen	Significant Hazard	8 ft	1990	Earth	Louisiana
Allen Dam Franklin	Significant Hazard	—	—	Earth	North Carolina
Allen Fossil Plant - Ash Disposal Area Perimeter Dike (East) Shelby	Significant Hazard	23 ft	1967	Earth	Tennessee
Allen Lake Boulder	Significant Hazard	24 ft	1928	Earth	Colorado
Allen Mill Pond Dam Worcester	Significant Hazard	18 ft	—	Masonry	Massachusetts
Allen Pond Dam Otsego	Significant Hazard	18 ft	1917	Other	New York
Allen Pond Dam Litchfield	Significant Hazard	15 ft	—	Concrete	Connecticut
Allen Street Detention Pond Dam Chautauqua	Significant Hazard	21 ft	—	Earth	New York
Alliance Consulting Engineers, INC. Weber	Significant Hazard	—	—	Earth	Utah
Alliance Sludge Lagoons Stark	Significant Hazard	12 ft	1993	Earth	Ohio
Allie Valley	Significant Hazard	30 ft	1960	Earth	Montana
Alligator Creek Salinity Barrier Charlotte	Significant Hazard	6 ft	—	Concrete	Florida
Alligator Lake Weir Pinellas	Significant Hazard	9 ft	—	Earth	Florida
Allison Dam Butler	Significant Hazard	20 ft	1970	Earth	Kansas
Allison Dam Cabarrus	Significant Hazard	—	—	Earth	North Carolina
Allison Lake Marshall	Significant Hazard	—	1971	Earth	Tennessee
Alloway Lake Dam Salem	Significant Hazard	20 ft	1949	Earth	New Jersey
All Vac Dam Union	Significant Hazard	—	—	Earth	North Carolina
Alma Lake Dam Parke	Significant Hazard	46 ft	1935	Earth	Indiana
Almonesson Lake Dam Gloucester	Significant Hazard	24 ft	1926	Earth	New Jersey
Alpena/Murdock/Slurry Pond 5 Dam Douglas	Significant Hazard	23 ft	1984	Earth	Illinois
Alpine Sanitary Apache	Significant Hazard	9 ft	1980	Earth	Arizona
Al Produce Dam Schuyler	Significant Hazard	15 ft	2016	—	New York
Alsbury Mesa	Significant Hazard	25 ft	1996	Earth	Colorado
Alsey Lake Dam Scott	Significant Hazard	27 ft	1969	Earth	Illinois
Altamont Reservoir Dam Albany	Significant Hazard	23 ft	1936	Earth	New York
Altamont Reservoir Dam Effingham	Significant Hazard	42 ft	1972	Earth	Illinois
Alta Vista 36 Lincoln	Significant Hazard	32 ft	2006	Earth	Minnesota
Altemus Indiana	Significant Hazard	30 ft	1987	Earth	Pennsylvania
Alton Pond Washington	Significant Hazard	19 ft	1920	—	Rhode Island
Alton Twin Lakes-South Lake Dam Madison	Significant Hazard	32 ft	1970	Earth	Illinois
Altus Reservoir Jackson	Significant Hazard	14 ft	1940	Earth	Oklahoma
Alum Pond Dam Worcester	Significant Hazard	9 ft	—	Earth	Massachusetts
Amann Reservoir Dam Morrow	Significant Hazard	32 ft	1904	Earth	Ohio
Amann Reservoir Upper Dam Morrow	Significant Hazard	22 ft	1964	Earth	Ohio
Amarillo Citadel Dam Potter	Significant Hazard	20 ft	1986	Earth	Texas
Amarillo Valley Road Pinal	Significant Hazard	8 ft	1995	Earth	Arizona
Ament Lake Dam Brewster	Significant Hazard	59 ft	1911	Masonry	Texas
American Fork Debris Basin Utah	Significant Hazard	—	1984	Earth	Utah
American Fork Lower Reservoir Utah	Significant Hazard	—	2009	Earth	Utah
American Zinc Smelter Company Large Lake Dam Montgomery	Significant Hazard	31 ft	1916	Earth	Illinois
Ames Pond Dam Plymouth	Significant Hazard	15 ft	1992	Earth	Massachusetts
Ames Pond Dike B Middlesex	Significant Hazard	11 ft	—	Earth	Massachusetts
Amherst Portage	Significant Hazard	14 ft	1857	Gravity	Wisconsin
Amherst Lake Windsor	Significant Hazard	13 ft	—	Concrete	Vermont
Amidon Farm Dam Windham	Significant Hazard	12 ft	—	Earth	Connecticut
Amity Hills Dam Yamhill	Significant Hazard	32 ft	—	Earth	Oregon