Water Supply Dams

7,228 dams in the US serve this purpose.

Dam Name	Hazard	Height	Built	Type	State
Twitty Dam Union	High Hazard	—	1973	Earth	North Carolina
Tx No Name No 2 Dam Madison	Low Hazard	20 ft	1964	Earth	Texas
Tx No Name No 47 Dam	Low Hazard	10 ft	1972	Earth	Texas
Tygart Dam Taylor	High Hazard	—	1938	Gravity	West Virginia
Tyner Lake Dam Jackson	High Hazard	64 ft	1969	Earth	Kentucky
Tyrone Reservoir #2 Blair	High Hazard	51 ft	1912	Earth	Pennsylvania
Ubelacker Dam Washington	Low Hazard	12 ft	1971	Earth	Florida
Ueland Dam Griggs	Low Hazard	15 ft	1934	Other	North Dakota
Ulbrich Reservoir Dam New Haven	High Hazard	17 ft	1966	Earth	Connecticut
Underground Mine Water Management Storage Impound. Saline	Low Hazard	15 ft	—	Earth	Illinois
Unimin Le Sueur	Low Hazard	20 ft	1982	Earth	Minnesota
Union City Reservoir Erie	High Hazard	36 ft	1935	Earth	Pennsylvania
Union-Lancster Wat Sup Dm Lancaster	Low Hazard	65 ft	1992	—	South Carolina
Union Main Alpine	Low Hazard	36 ft	1910	Rockfill	California
Union Pond Dam Fairfield	Significant Hazard	16 ft	—	Masonry	Connecticut
Union Water Works Dam Union	High Hazard	22 ft	1962	—	South Carolina
Unity #1 Dam Jackson	High Hazard	48 ft	1927	Buttress	Missouri
Unity #2 Dam Jackson	High Hazard	52 ft	1957	Earth	Missouri
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
Unnamed Dam Clay	Low Hazard	13 ft	—	Earth	Florida
Unnamed Dam Clay	Significant Hazard	10 ft	—	Earth	Florida
Un-Named Dam Clay	Low Hazard	34 ft	—	Earth	Florida
Un-Named Dam (Sum01) Sumter	Low Hazard	29 ft	—	Earth	Florida
Upper 4s Ranch San Diego	Low Hazard	28 ft	1927	Arch	California
Upper Ansonia Reservoir Dam New Haven	High Hazard	21 ft	1887	Masonry	Connecticut
Upper Appleton Locks and Dam Outagamie	Significant Hazard	—	1940	Concrete	Wisconsin
Upper Artichoke Reservoir Dam Essex	Low Hazard	15 ft	1920	Concrete	Massachusetts
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 Big Blue River Structure No. 13 Henry	Significant Hazard	64 ft	1974	Earth	Indiana
Upper Blue Summit	High Hazard	75 ft	1965	Rockfill	Colorado
Upper Castanea Reservoir Clinton	High Hazard	30 ft	1869	Earth	Pennsylvania
Upper Centerville Reservoir Dam Appanoose	Significant Hazard	48 ft	1912	Earth	Iowa
Upper Chiquita Orange	High Hazard	177 ft	2012	Earth	California
Upper Cibolo Creek WS SCS Site 1 Dam Kendall	High Hazard	87 ft	1978	Earth	Texas
Upper Clark Reservoir Malheur	Low Hazard	—	2004	Gravity	Oregon
Upper Clinch Valley Dam #1b Tazewell	High Hazard	76 ft	—	Earth	Virginia
Upper Cogdill Moffat	Low Hazard	30 ft	1956	Earth	Colorado
Upper Dam Chautauqua	Significant Hazard	35 ft	1935	—	Kansas
Upper Elder Shasta	Low Hazard	26 ft	—	Earth	California
Upper Franklin Dam Los Angeles	Significant Hazard	40 ft	1915	Earth	California
Upper Girard Lake Dam Trumbull	High Hazard	55 ft	1929	Earth	Ohio
Upper Glen Reservoir Dam Franklin	Significant Hazard	59 ft	—	Concrete	Massachusetts
Upper Godfrey Dam Loudoun	Unknown	10 ft	—	Earth	Virginia
Upper Goldwater Yavapai	High Hazard	52 ft	1932	Buttress	Arizona
Upper Hart Pond Dam Hartford	High Hazard	13 ft	1920	Earth	Connecticut
Upper Hollywood Los Angeles	Low Hazard	87 ft	1933	Earth	California
Upper Howell Santa Clara	Significant Hazard	36 ft	1878	Earth	California