High Hazard Dams

Loss of human life is likely if the dam fails.

Dam Name	Hazard	Height	Built	Type	State
Black Upper Lake Dam St. Francois	High Hazard	30 ft	1976	Earth	Missouri
Blackwater Dam Merrimack	High Hazard	75 ft	1941	Gravity	New Hampshire
Blackwater Dam - Dodge Estate Dike Merrimack	High Hazard	18 ft	1941	Gravity	New Hampshire
Blackwater Dam - Little Hill Dike Merrimack	High Hazard	38 ft	1941	Gravity	New Hampshire
Blackwell Mine Dam Washington	High Hazard	85 ft	1980	Other	Missouri
Blackwell Pond Dam St. Francois	High Hazard	50 ft	1957	Other	Missouri
Blackwood Creek 11-A Hayes	High Hazard	59 ft	1992	Earth	Nebraska
Blair Gap Blair	High Hazard	47 ft	1907	Gravity	Pennsylvania
Blair Lake Dam Pike	High Hazard	40 ft	—	Earth	Missouri
Blair Lake Dam Warren	High Hazard	18 ft	1903	Masonry	New Jersey
Blair Reservoir Dam Benton	High Hazard	—	1937	Earth	Washington
Blairs Pond Dam Kent	High Hazard	15 ft	—	Gravity	Delaware
Blairs Valley Dam Washington	High Hazard	34 ft	1968	Earth	Maryland
Blake St. Lawrence	High Hazard	80 ft	1957	Concrete	New York
Blakely Mountain Dam Garland	High Hazard	226 ft	1953	Earth	Arkansas
Blake's Creek Site No.7 Kanawha	High Hazard	46 ft	1970	Earth	West Virginia
Blalock Reservoir Dam Henry	High Hazard	39 ft	1988	Earth	Georgia
Blanchard Dam #4 Harnett	High Hazard	—	—	Earth	North Carolina
Blanchard Debris Basin Los Angeles	High Hazard	50 ft	1966	Earth	California
Blanchard Lake Dam #1 Harnett	High Hazard	—	1943	Earth	North Carolina
Blanchard Lake Dam #2 Harnett	High Hazard	—	1953	Earth	North Carolina
Blanchard Lake Dam #3 Harnett	High Hazard	—	1953	Earth	North Carolina
Blanchard Lake Dam #4 Harnett	High Hazard	—	—	Earth	North Carolina
Blanchard-Offner Napa	High Hazard	47 ft	1963	Earth	California
Blanchester Reservoir No. 3 Dam Clinton	High Hazard	15 ft	1934	Earth	Ohio
Blanchester Reservoir No. 4 Dam Clinton	High Hazard	16 ft	1950	Earth	Ohio
Blanchester Res No. 6 Dam Clinton	High Hazard	24 ft	2003	Earth	Ohio
Blanco Reservoir Dam San Juan	High Hazard	43 ft	1957	Earth	New Mexico
Blanding City No. 3 San Juan	High Hazard	—	1961	Earth	Utah
Blanding City No. 4 San Juan	High Hazard	—	1965	Earth	Utah
Blandinsville City Reservoir Dam McDonough	High Hazard	20 ft	1940	Earth	Illinois
Blanket Creek WS SCS Site 15 Dam Brown	High Hazard	41 ft	1965	Earth	Texas
Blanket Creek WS SCS Site 17a 1 Dam Mills	High Hazard	51 ft	1969	Earth	Texas
Blanket Creek WS SCS Site 18 Dam Mills	High Hazard	42 ft	1965	Earth	Texas
Blanket Creek WS SCS Site 19 Dam Mills	High Hazard	45 ft	1965	Earth	Texas
Blanket Creek WS SCS Site 1 Dam Brown	High Hazard	32 ft	1965	Earth	Texas
Blanket Creek WS SCS Site 2a Dam Comanche	High Hazard	37 ft	1969	Earth	Texas
Blanket Creek WS SCS Site 3 Dam Brown	High Hazard	29 ft	1965	Earth	Texas
Blanket Creek WS SCS Site 4 Dam Brown	High Hazard	30 ft	1965	Earth	Texas
Blanket Creek WS SCS Site 9 Dam Brown	High Hazard	42 ft	1969	Earth	Texas
Bleachery Pond Providence	High Hazard	8 ft	1883	Earth	Rhode Island
Blenheim - Gilboa Lower Schoharie	High Hazard	100 ft	1974	Earth	New York
Blenheim - Gilboa Upper Schoharie	High Hazard	110 ft	1974	Earth	New York
Blewett Falls Anson	High Hazard	54 ft	1912	Concrete	North Carolina
Blind Brook Club Dam Westchester	High Hazard	32 ft	1959	Concrete	New York
Bliss Gooding	High Hazard	140 ft	1950	Concrete	Idaho
Blixit Creek Missoula	High Hazard	30 ft	1961	Earth	Montana
Blomberg Farm Dam Macon	High Hazard	43 ft	1998	Earth	Missouri
Bloomer Mill Chippewa	High Hazard	17 ft	1856	Gravity	Wisconsin
Bloomfield City Park Dam Nelson	High Hazard	26 ft	1952	Earth	Kentucky