High Hazard Dams

Loss of human life is likely if the dam fails.

Dam Name	Hazard	Height	Built	Type	State
Union City Reservoir Erie	High Hazard	36 ft	1935	Earth	Pennsylvania
Union Falls Clinton	High Hazard	24 ft	1905	Concrete	New York
Union Lake Dam Jackson	High Hazard	27 ft	1960	Earth	Missouri
Union Lake Dam Cumberland	High Hazard	35 ft	1869	Earth	New Jersey
Union Pond Dam Hartford	High Hazard	33 ft	1901	Concrete	Connecticut
Union Street Dam Grand Traverse	High Hazard	21 ft	1867	Earth	Michigan
Union Valley El Dorado	High Hazard	440 ft	1962	Earth	California
Union Village Dam Orange	High Hazard	164 ft	1950	Gravity	Vermont
Unionville Old City Lake Dam Putnam	High Hazard	28 ft	1914	Earth	Missouri
Union Water Works Dam Union	High Hazard	22 ft	1962	—	South Carolina
United Off-Channel Reservoir Dam Hidalgo	High Hazard	18 ft	—	Earth	Texas
Unity Baker	High Hazard	82 ft	1937	Earth	Oregon
Unity #1 Dam Jackson	High Hazard	48 ft	1927	Buttress	Missouri
Unity #2 Dam Jackson	High Hazard	52 ft	1957	Earth	Missouri
University Commons Dam Richmond City	High Hazard	21 ft	—	Earth	Virginia
University Lake Dam Orange	High Hazard	—	1932	Earth	North Carolina
University Mound North Basin San Francisco	High Hazard	17 ft	1885	Earth	California
University Mound South Basin San Francisco	High Hazard	61 ft	1937	Earth	California
University of Montevallo Lake Dam Shelby	High Hazard	—	1958	Earth	Alabama
University Park Airport Pond 1a Centre	High Hazard	24 ft	1995	Earth	Pennsylvania
University Place Dam Mecklenburg	High Hazard	—	1985	Earth	North Carolina
University Place On The Green Dam Mecklenburg	High Hazard	—	1997	Earth	North Carolina
University Pond Dam Mecklenburg	High Hazard	—	—	Other	North Carolina
Univ Mo Exp Farm Dam- Mononame 207 St. Charles	High Hazard	29 ft	1958	Earth	Missouri
Univ of Mo-R1 Dam Boone	High Hazard	18 ft	1959	Earth	Missouri
Unnamned Dam Pinellas	High Hazard	15 ft	—	Earth	Florida
Untermeyer Dam Morris	High Hazard	23 ft	1927	Earth	New Jersey
Updegrave Douglas	High Hazard	30 ft	1957	Earth	Oregon
Upland Basin San Bernardino	High Hazard	20 ft	2008	Earth	California
Upper Alexandria Dam Campbell	High Hazard	35 ft	1930	Earth	Kentucky
Upper (Allen Creek) Dam Brunswick	High Hazard	—	—	Other	North Carolina
Upper Ansonia Reservoir Dam New Haven	High Hazard	21 ft	1887	Masonry	Connecticut
Upper Baker Whatcom	High Hazard	312 ft	1959	Gravity	Washington
Upper Baker Dam Fallon	High Hazard	20 ft	1975	Earth	Montana
Upper Banjo Pond Dam Essex	High Hazard	17 ft	1908	Concrete	Massachusetts
Upper Bear Amador	High Hazard	77 ft	1900	Rockfill	California
Upper Bear Creek Dam Marion	High Hazard	85 ft	1978	Earth	Alabama
Upper Beaver Brook Clear Creek	High Hazard	88 ft	1924	Earth	Colorado
Upper Beaver Dam Dodge	High Hazard	20 ft	1840	Earth	Wisconsin
Upper Beaver Falls Lewis	High Hazard	27 ft	1937	Concrete	New York
Upper Big Blue River Structure No. 15 Henry	High Hazard	40 ft	1969	Earth	Indiana
Upper Big Blue River Structure No. 18 Henry	High Hazard	45 ft	1994	Earth	Indiana
Upper Big Blue River Structure No. 19 Henry	High Hazard	33 ft	1995	Earth	Indiana
Upper Big Blue River Structure No. 7-A Henry	High Hazard	62 ft	1976	Earth	Indiana
Upper Big Nemaha 11-A Lancaster	High Hazard	36 ft	1971	Earth	Nebraska
Upper Big Nemaha 25-C Gage	High Hazard	42 ft	1974	Earth	Nebraska
Upper Big Nemaha 7-A Gage	High Hazard	37 ft	1970	Earth	Nebraska
Upper Birchwood Lake Pike	High Hazard	23 ft	—	Earth	Pennsylvania
Upper Blackwater River Dam #4 Franklin	High Hazard	52 ft	—	Earth	Virginia
Upper Blackwater River Dam #6 Franklin	High Hazard	50 ft	—	Earth	Virginia