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
Umstc Lower Dam (Curie Drive) Prince George's	Significant Hazard	38 ft	2001	Earth	Maryland
Unadilla Mill Dam Livingston	Significant Hazard	10 ft	1860	Earth	Michigan
Underwood Lake Autauga	Significant Hazard	—	1956	Earth	Alabama
Underwood Park Sullivan	Significant Hazard	—	1963	Earth	Tennessee
Unger Wayne	Significant Hazard	9 ft	1947	Earth	Pennsylvania
Unger-Bill Dam Washington	Significant Hazard	39 ft	1968	Earth	Oregon
Unh Water Treament Residual Lagoons Strafford	Significant Hazard	5 ft	2017	Earth	New Hampshire
Unicorn Branch Dam Queen Anne's	Significant Hazard	13 ft	1964	Earth	Maryland
Unimin Quarry Dam Jefferson	Significant Hazard	25 ft	—	Earth	Missouri
Union Weld	Significant Hazard	33 ft	1902	Earth	Colorado
Union Grove Lake Dam Tama	Significant Hazard	29 ft	1920	Earth	Iowa
Union Ice Company Pond Dam New Haven	Significant Hazard	6 ft	—	Earth	Connecticut
Union Meadows Dam Carroll	Significant Hazard	10 ft	1935	Concrete	New Hampshire
Union Mill Lake Dam Burlington	Significant Hazard	13 ft	—	Earth	New Jersey
Union Mill Pond Providence	Significant Hazard	7 ft	1883	Earth	Rhode Island
Union Mills Dam LaPorte	Significant Hazard	12 ft	1920	Earth	Indiana
Union Pond Dam Fairfield	Significant Hazard	16 ft	—	Masonry	Connecticut
Union Street Hillsborough	Significant Hazard	15 ft	1916	Concrete	New Hampshire
Unionville Pond Dam Worcester	Significant Hazard	21 ft	1909	Earth	Massachusetts
Unit 3 Fgd Pond 2 Carbon	Significant Hazard	25 ft	1998	Earth	Wyoming
University Park Airport Pond 4a Centre	Significant Hazard	29 ft	1998	Earth	Pennsylvania
University Pond Dam Fairfield	Significant Hazard	1 ft	—	Earth	Connecticut
University School Lake Dam Cuyahoga	Significant Hazard	53 ft	1968	Earth	Ohio
Unnamed Dam Clay	Significant Hazard	10 ft	—	Earth	Florida
Unnamed Pond Dam Litchfield	Significant Hazard	—	—	—	Connecticut
Up Dam (H Bigelow V G C) Windham	Significant Hazard	10 ft	—	Earth	Connecticut
Upland Cell Ii Interior St. Louis	Significant Hazard	60 ft	2011	Earth	Minnesota
Upper Aetna Lake Dam Burlington	Significant Hazard	14 ft	1928	Earth	New Jersey
Upper Appleton Locks and Dam Outagamie	Significant Hazard	—	1940	Concrete	Wisconsin
Upper Bayou Nezpique No 6 Evangeline	Significant Hazard	21 ft	1969	Earth	Louisiana
Upper Big Bethel Dam Hampton	Significant Hazard	18 ft	—	Earth	Virginia
Upper Big Blue River Structure No. 13 Henry	Significant Hazard	64 ft	1974	Earth	Indiana
Upper Big Blue River Structure No. 14 Henry	Significant Hazard	38 ft	1971	Earth	Indiana
Upper Big Blue River Structure No. 2 Rush	Significant Hazard	35 ft	1972	Earth	Indiana
Upper Big Blue River Structure No. 3 Rush	Significant Hazard	54 ft	1974	Earth	Indiana
Upper Big Nemaha 1-B41 Johnson	Significant Hazard	43 ft	1982	Earth	Nebraska
Upper Big Nemaha 27-R Gage	Significant Hazard	30 ft	1986	Earth	Nebraska
Upper Big Nemaha 6-A Gage	Significant Hazard	41 ft	1978	Earth	Nebraska
Upper Big Nemaha G-24 Gage	Significant Hazard	29 ft	1982	Earth	Nebraska
Upper Big Nemaha J-37 Johnson	Significant Hazard	25 ft	1969	Earth	Nebraska
Upper Big Nemaha L-4 Lancaster	Significant Hazard	25 ft	1971	Earth	Nebraska
Upper Black Creek Res Summit	Significant Hazard	41 ft	1957	Earth	Colorado
Upper Blackwelder Dam Yuba	Significant Hazard	14 ft	1955	Rockfill	California
Upper Bolton Lake Causeway Dam Tolland	Significant Hazard	7 ft	—	Earth	Connecticut
Upper Bosque River WS SCS Site 17 Dam Erath	Significant Hazard	60 ft	1967	Earth	Texas
Upper Bosque River WS SCS Site 24 Dam Erath	Significant Hazard	50 ft	1968	Earth	Texas
Upper Branham Madison	Significant Hazard	6 ft	1980	Earth	Montana
Upper Bucknell Pond Dam Carroll	Significant Hazard	31 ft	2010	Earth	New Hampshire
Upper Centerville Reservoir Dam Appanoose	Significant Hazard	48 ft	1912	Earth	Iowa
Upper Chester Reservoir Windsor	Significant Hazard	20 ft	1915	Earth	Vermont