Water Supply Dams

7,228 dams in the US serve this purpose.

Dam Name	Hazard	Height	Built	Type	State
Sims Dam Concho	Low Hazard	20 ft	1966	Earth	Texas
Sinaloa Lake Ventura	High Hazard	30 ft	1925	Earth	California
Sinclair Baldwin	High Hazard	104 ft	1953	Gravity	Georgia
Singer Lake Dam McMullen	Low Hazard	15 ft	1967	Earth	Texas
Sioux Falls Diversion Minnehaha	Significant Hazard	21 ft	1960	Gravity	South Dakota
Sioux Falls Divers. Weir Minnehaha	Significant Hazard	27 ft	1960	Gravity	South Dakota
Sirrianni Lake Dam Frio	Low Hazard	20 ft	1964	Earth	Texas
Siscowit Reservoir Dam Fairfield	Significant Hazard	6 ft	1865	Earth	Connecticut
Sisson Pond Newport	High Hazard	14 ft	1900	Rockfill	Rhode Island
Six Mile Lane Lake Dam Clinton	High Hazard	37 ft	1958	Earth	Missouri
Sjwd Water Dist Rcc Dam Spartanburg	High Hazard	44 ft	1997	—	South Carolina
Skalicky Dam Houston	Low Hazard	17 ft	1950	Earth	Texas
Skallerup Dam Loudoun	Unknown	28 ft	—	Earth	Virginia
Skaneateles Lake Dam Onondaga	High Hazard	22 ft	1902	Masonry	New York
Skiatook Dam Osage	High Hazard	143 ft	1984	Earth	Oklahoma
Skiffes Creek Dam James City	Low Hazard	16 ft	—	Earth	Virginia
Skim Milk Delta	Low Hazard	16 ft	1904	Earth	Colorado
Skinner Clearwell Riverside	High Hazard	44 ft	1991	Earth	California
Skookumchuck Thurston	High Hazard	160 ft	1970	Earth	Washington
Skyhaven Lake Dam Johnson	High Hazard	20 ft	1955	Earth	Missouri
Sky-Lin Farms Ii Reservoir Caddo	Low Hazard	12 ft	2017	Earth	Louisiana
Sky-Lin Farms Reservoir Caddo	Low Hazard	25 ft	2017	Earth	Louisiana
Sky-Lin Services Reservoir Caddo	Low Hazard	25 ft	2018	Earth	Louisiana
Skyrocket Calaveras	High Hazard	43 ft	1999	Earth	California
Skyscraper Boulder	Low Hazard	22 ft	1940	Masonry	Colorado
Slack and Weiss Jackson	Low Hazard	14 ft	1890	Earth	Colorado
Slate Creek Plumas	Low Hazard	68 ft	1961	Concrete	California
Slate River Dam #2 Buckingham	High Hazard	45 ft	—	Earth	Virginia
Slaughter Lake Dam Madison	Low Hazard	15 ft	1963	Earth	Texas
Sleepy Hollow Dam Greene	High Hazard	83 ft	1972	Earth	New York
Sleepy Hollow No. 2 Sonoma	High Hazard	39 ft	1949	Earth	California
Slickrock Creek Shasta	Significant Hazard	155 ft	2004	Earth	California
Sloan Quarry Water Storage Pond Dam Clark	Significant Hazard	46 ft	—	Earth	Nevada
Slurry Impoundment Saline	Significant Hazard	34 ft	—	Earth	Illinois
Slurry Impoundment #4 Jefferson	Low Hazard	100 ft	—	Earth	Alabama
Slurry Impoundment 401 Breathitt	High Hazard	280 ft	—	Earth	Kentucky
Slurry Impoundment Cfd-3 Muhlenberg	Low Hazard	65 ft	—	Earth	Kentucky
Slurry Impoundment No. 1 Tuscaloosa	Low Hazard	40 ft	—	Earth	Alabama
Slurry Impoundment No.1 Jefferson	Low Hazard	19 ft	—	Earth	Alabama
Slurry Impoundment No. 3 Jefferson	Low Hazard	60 ft	—	Earth	Alabama
Slurry Pond No. 1 Greene	Low Hazard	90 ft	—	Earth	Pennsylvania
Slurry Pond No. 3 Jefferson	Low Hazard	50 ft	—	Earth	Alabama
Sly Creek Butte	High Hazard	299 ft	1961	Earth	California
Slyder Lake Dam Dimmit	Low Hazard	13 ft	1940	Earth	Texas
Sly Park El Dorado	High Hazard	182 ft	1955	Earth	California
Smelley Lake Dam Hood	Low Hazard	30 ft	1977	Earth	Texas
Smiley Reservoir Carbon	Low Hazard	47 ft	2000	Earth	Wyoming
Smith (Bill) Dam Union	Low Hazard	28 ft	2013	Earth	Iowa
Smith Dam Augusta	Unknown	15 ft	—	Earth	Virginia
Smith Dam Uvalde	Low Hazard	15 ft	1960	Earth	Texas