High Hazard Dams

Loss of human life is likely if the dam fails.

Dam Name	Hazard	Height	Built	Type	State
Upper Mint Springs Dam Albemarle	High Hazard	30 ft	—	Earth	Virginia
Upper Mohawk Lake Dam Sussex	High Hazard	16 ft	1927	Earth	New Jersey
Upper Mount Glen Lake Dam Passaic	High Hazard	8 ft	1927	Earth	New Jersey
Upper Mount Pleasant Luzerne	High Hazard	20 ft	1882	Earth	Pennsylvania
Upper Mud River No.2a Lincoln	High Hazard	75 ft	1992	Rockfill	West Virginia
Upper Mulberry River WS Str. # 11 Gwinnett	High Hazard	46 ft	1970	Earth	Georgia
Upper Mulberry River WS Str. # 7 Gwinnett	High Hazard	44 ft	1980	Earth	Georgia
Upper North River #76 Augusta	High Hazard	118 ft	—	Earth	Virginia
Upper North River #77 Augusta	High Hazard	107 ft	1966	Earth	Virginia
Upper North River Dam #10 Augusta	High Hazard	68 ft	—	Earth	Virginia
Upper (North) Wiccopee Dam Putnam	High Hazard	34 ft	1939	Concrete	New York
Upper Norton Reservoir Dam Norton	High Hazard	78 ft	—	Earth	Virginia
Upper Occoquan Dam Prince William	High Hazard	65 ft	—	Gravity	Virginia
Upper Occoquan Sewage Authority Dam Fairfax	High Hazard	41 ft	—	Earth	Virginia
Upper Oso Orange	High Hazard	142 ft	1979	Earth	California
Upper Ouachita Site 1 Polk	High Hazard	88 ft	1977	Earth	Arkansas
Upper Owl Creek Schuylkill	High Hazard	43 ft	1921	Earth	Pennsylvania
Upper Peak Lake Placer	High Hazard	39 ft	1850	Earth	California
Upper Pecan Bayou WS SCS Site 31 Dam Brown	High Hazard	24 ft	1971	Earth	Texas
Upper Pecan Bayou WS SCS Site 32 Dam Brown	High Hazard	37 ft	1971	Earth	Texas
Upper Pecan Bayou WS SCS Site 33 Dam Brown	High Hazard	25 ft	1973	Earth	Texas
Upper Pelzer Anderson	High Hazard	27 ft	1881	Gravity	South Carolina
Upper Penasco Site 1 Otero	High Hazard	48 ft	1960	Earth	New Mexico
Upper Penasco Site 2 Otero	High Hazard	64 ft	1959	Earth	New Mexico
Upper Penasco Site 3a Otero	High Hazard	51 ft	1959	Earth	New Mexico
Upper Peoga Lake Dam Johnson	High Hazard	30 ft	1946	Earth	Indiana
Upper Petit Jean Wid Site 5 Scott	High Hazard	61 ft	1986	Earth	Arkansas
Upper Petit Jean Wid Site 9 Logan	High Hazard	75 ft	1978	Earth	Arkansas
Upper Point of Pines Graham	High Hazard	—	1970	Earth	Arizona
Upper Potomac Industrial Park Levee Allegany	High Hazard	8 ft	2005	Earth	Maryland
Upper Powhatan Dam Powhatan	High Hazard	27 ft	—	Earth	Virginia
Upper Quail Hollow Dam Lexington	High Hazard	37 ft	1971	—	South Carolina
Upper Raintree Lake Dam Upshur	High Hazard	42 ft	1970	Earth	Texas
Upper Reservoir Dam Grafton	High Hazard	30 ft	1924	Earth	New Hampshire
Upper Rickards Pike	High Hazard	9 ft	1937	Earth	Pennsylvania
Upper Ridge Westmoreland	High Hazard	25 ft	1915	Earth	Pennsylvania
Upper Rio Hondo Site No. 1 Dam Lincoln	High Hazard	83 ft	1959	Earth	New Mexico
Upper Root Reservoir Berkshire	High Hazard	36 ft	1960	Earth	Massachusetts
Upper Sackett Reservoir Dam Berkshire	High Hazard	76 ft	1947	Concrete	Massachusetts
Upper Salem Dam Harrison	High Hazard	49 ft	1970	Earth	West Virginia
Upper Salt Creek 10-A Lancaster	High Hazard	36 ft	1963	Earth	Nebraska
Upper Salt Creek 35-A Lancaster	High Hazard	32 ft	1961	Earth	Nebraska
Upper Salt Creek 3-A Lancaster	High Hazard	48 ft	1955	Earth	Nebraska
Upper Salt Creek Structure 2 Dam Cook	High Hazard	23 ft	1984	Earth	Illinois
Upper Salt Creek Structure 3 Dam Cook	High Hazard	26 ft	1985	Earth	Illinois
Upper Salt Creek Structure 4 Dam Cook	High Hazard	14 ft	1987	Earth	Illinois
Upper Sand Creek Detention Basin Contra Costa	High Hazard	40 ft	2014	Earth	California
Upper San Marcos River WS NRCS Site 5 Dam Hays	High Hazard	65 ft	1989	Earth	Texas
Upper San Marcos River WS SCS Site 1 Hays	High Hazard	80 ft	1983	Earth	Texas
Upper San Marcos River WS SCS Site 2 Hays	High Hazard	51 ft	1985	Earth	Texas