Water Supply Dams

7,228 dams in the US serve this purpose.

Dam Name	Hazard	Height	Built	Type	State
Sumter Farm and Stock Company Sumter	Low Hazard	—	1941	Earth	Alabama
Sundstrom Dam No 2 San Juan	Low Hazard	—	1984	Earth	Washington
Sunflower Tehama	Low Hazard	50 ft	1976	Earth	California
SUNNYHILL INLET STRUCTURE Marion	Low Hazard	14 ft	—	Earth	Florida
Sunnyhill Structure CD-1 Marion	High Hazard	8 ft	2007	Earth	Florida
Sunnymead Ranch Riverside	High Hazard	41 ft	1985	Earth	California
Sunnyside Cogeneration Reservoir Carbon	Significant Hazard	—	1992	Earth	Utah
Sun Ridge Meadow El Dorado	Low Hazard	18 ft	1990	Earth	California
Sunset Hills Lake 2 Dam Tazewell	High Hazard	35 ft	1964	Earth	Illinois
Sunset Lake Windham	Significant Hazard	10 ft	1910	Earth	Vermont
Sunset North Basin San Francisco	High Hazard	74 ft	1938	Earth	California
Sunset South Basin San Francisco	High Hazard	34 ft	1960	Earth	California
Suntaug Lake Dam Essex	High Hazard	17 ft	1971	Earth	Massachusetts
Sun Valley Lake Dam Ringgold	Significant Hazard	67 ft	1971	Earth	Iowa
Superior Boulder	High Hazard	59 ft	1994	Earth	Colorado
Superior Lake Dam Jefferson	Low Hazard	23 ft	1953	Earth	Illinois
Supply Pond Dam Hillsborough	High Hazard	28 ft	1854	Earth	New Hampshire
Sutherland San Diego	High Hazard	162 ft	1954	Multi-Arch	California
Sutro Reservoir San Francisco	High Hazard	55 ft	1952	Earth	California
Suttenfield Sonoma	High Hazard	76 ft	1938	Earth	California
Svcsd Reclamation Pond 1 Sonoma	Significant Hazard	17 ft	1990	Earth	California
Svcsd Reclamation Pond 2 Sonoma	Significant Hazard	19 ft	1990	Earth	California
Swan Nevada	High Hazard	59 ft	1967	Earth	California
Swan Dam Culpeper	Unknown	20 ft	—	Earth	Virginia
Swann Water Treatment Plant Rwr Dam #1 (Aka Nw) Forsyth	High Hazard	—	2003	Earth	North Carolina
Swann Water Treatment Plant Rwr Dam #1 (Aka Nw) Forsyth	High Hazard	—	2004	Earth	North Carolina
Swansea Print Works Dam Bristol	Low Hazard	15 ft	1900	Gravity	Massachusetts
Swansea Reservoir Dam Bristol	Low Hazard	13 ft	1883	Rockfill	Massachusetts
Swanton Upground Reservoir Lucas	Significant Hazard	24 ft	1937	Earth	Ohio
Swanzy Lake Solano	High Hazard	86 ft	1931	Earth	California
Sw Ark W D Holding Basin Dam Little River	Significant Hazard	—	1968	Earth	Arkansas
Swatara Dauphin	Low Hazard	10 ft	1935	Concrete	Pennsylvania
Sweet Briar College - Lower Dam Amherst	High Hazard	32 ft	—	Gravity	Virginia
Sweetwater Main San Diego	High Hazard	112 ft	1888	Gravity	California
Swenson Lake Dam Throckmorton	Low Hazard	16 ft	1962	Earth	Texas
Swfwmd Lake Tarpon Control Structure (S-551) Pinellas	Low Hazard	16 ft	—	Earth	Florida
Swfwmd Magdelene Control Structure #3 Hillsborough	Significant Hazard	2 ft	—	Earth	Florida
Swfwmd P-1 (Lake Lena) Water Conservation Structure Polk	High Hazard	8 ft	—	Earth	Florida
Swfwmd Parker Structure Polk	High Hazard	7 ft	—	Earth	Florida
Swfwmd Scott Lake Structure Polk	High Hazard	7 ft	—	Earth	Florida
Swfwmd Structure P-8 (Hamilton) Water Conservation Polk	High Hazard	14 ft	1965	Earth	Florida
Swift Creek Reservoir Dam Chesterfield	High Hazard	44 ft	—	Earth	Virginia
Swift-Eckrich Dam Madison	Low Hazard	43 ft	1986	Earth	Arkansas
Swift Run Lake Dam Miami	High Hazard	39 ft	1876	Earth	Ohio
Swifts Dam Louisa	Unknown	15 ft	—	Other	Virginia
Swimming River Reservoir Dam Monmouth	High Hazard	45 ft	1901	Earth	New Jersey
Swine Graphics #1 Clarke	Low Hazard	44 ft	2000	Earth	Iowa
Swine Graphics Dam #2 Clarke	Low Hazard	47 ft	2005	Earth	Iowa
Switzerland Lake Dam Belmont	Significant Hazard	54 ft	1956	Earth	Ohio
Sworinger Lassen	High Hazard	35 ft	1961	Earth	California