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
Upper City Dam Strafford	Significant Hazard	14 ft	1920	Concrete	New Hampshire
Upper Collinsville Hartford	Significant Hazard	18 ft	1837	Stone	Connecticut
Upper Constantine Dam St. Joseph	Significant Hazard	13 ft	1903	Gravity	Michigan
Upper Crest Lake Dam Passaic	Significant Hazard	—	—	Earth	New Jersey
Upper Crow Hills Pond Dam Worcester	Significant Hazard	11 ft	1956	Earth	Massachusetts
Upper Dam Chautauqua	Significant Hazard	35 ft	1935	—	Kansas
Upper Deerfield Lake Dam Sumter	Significant Hazard	11 ft	1960	—	South Carolina
Upper Derby Adams	Significant Hazard	15 ft	1942	Earth	Colorado
Upper Detention Basin Dam	Significant Hazard	21 ft	—	—	Connecticut
Upper Earlville Reservoir Dam Madison	Significant Hazard	20 ft	1936	Earth	New York
Upper East Fk Laterals WS SCS Site 11a Dam Kaufman	Significant Hazard	35 ft	1963	Earth	Texas
Upper East Fk Laterals WS SCS Site 11b Dam Kaufman	Significant Hazard	29 ft	1963	Earth	Texas
Upper East Fk Laterals WS SCS Site 11k Dam Kaufman	Significant Hazard	34 ft	1964	Earth	Texas
Upper East Highland Lake Dam Sussex	Significant Hazard	15 ft	1957	Earth	New Jersey
Upper Eddy Pond Rutland	Significant Hazard	13 ft	1900	Earth	Vermont
Upper Fawn Lake Dam Taos	Significant Hazard	8 ft	—	Earth	New Mexico
Upper Flannagan Pond Dam Middlesex	Significant Hazard	9 ft	1955	Concrete	Massachusetts
Upper Flint Pond Dam Middlesex	Significant Hazard	10 ft	—	Masonry	Massachusetts
Upper Franklin Dam Los Angeles	Significant Hazard	40 ft	1915	Earth	California
Upper Fulton Lock & Dam 2 Oswego	Significant Hazard	13 ft	1927	Concrete	New York
Upper Garden Reservoir Dam Morris	Significant Hazard	6 ft	—	Earth	New Jersey
Upper George Ross Lake Dam Bastrop	Significant Hazard	16 ft	—	Earth	Texas
Upper Glen Reservoir Dam Franklin	Significant Hazard	59 ft	—	Concrete	Massachusetts
Upper Guilford Lakes Dam New Haven	Significant Hazard	12 ft	1929	Masonry	Connecticut
Upper Hiawatha Dam Montmorency	Significant Hazard	9 ft	1947	Earth	Michigan
Upper Highland Lake Dike Hampshire	Significant Hazard	15 ft	1930	Earth	Massachusetts
Upper Howell Santa Clara	Significant Hazard	36 ft	1878	Earth	California
Upper Izaak Walton Dam Amherst	Significant Hazard	25 ft	—	Earth	Virginia
Upper Keswick Dam Ocean	Significant Hazard	12 ft	1898	Earth	New Jersey
Upper Lake Avery Dam Trinity	Significant Hazard	15 ft	1910	Earth	Texas
Upper Lake Fork Creek WS SCS Site 2 Dam Hunt	Significant Hazard	28 ft	1961	Earth	Texas
Upper Lake Fork Creek WS SCS Site 3 Dam Hunt	Significant Hazard	26 ft	1963	Earth	Texas
Upper Lake Mary Coconino	Significant Hazard	38 ft	1941	Earth	Arizona
Upper Little Black D-4 Dam Ripley	Significant Hazard	40 ft	1986	Earth	Missouri
Upper Little Falls Washington	Significant Hazard	20 ft	1950	Concrete	Maine
Upper Little Nemaha 23 Lancaster	Significant Hazard	51 ft	2002	Earth	Nebraska
Upper Little Nemaha 5 Otoe	Significant Hazard	40 ft	1996	Earth	Nebraska
Upper Little Nemaha 79 Lancaster	Significant Hazard	38 ft	1998	Earth	Nebraska
Upper Little River Waldo	Significant Hazard	34 ft	1910	Concrete	Maine
Upper Lounsbury Pond Dam Westchester	Significant Hazard	15 ft	—	Masonry	New York
Upper Lynde Basin Dam Worcester	Significant Hazard	15 ft	1924	Earth	Massachusetts
Upper Maple River Dam Steele	Significant Hazard	35 ft	2015	Earth	North Dakota
Upper Massapequa Lake Dam Nassau	Significant Hazard	11 ft	1900	Earth	New York
Upper Mechanicville Saratoga	Significant Hazard	19 ft	1882	Masonry	New York
Upper Medicine Creek 370 Frontier	Significant Hazard	75 ft	1973	Earth	Nebraska
Upper Medicine Creek 390-B Frontier	Significant Hazard	71 ft	1975	Earth	Nebraska
Upper Medicine Creek 410 Frontier	Significant Hazard	69 ft	1976	Earth	Nebraska
Upper Mianus River Dam Fairfield	Significant Hazard	3 ft	1930	Masonry	Connecticut
Upper Millpond Dam New London	Significant Hazard	11 ft	1820	Earth	Connecticut
Upper Mill Pond Dam Middlesex	Significant Hazard	12 ft	1860	Earth	Connecticut