Water Supply Dams

7,228 dams in the US serve this purpose.

Dam Name	Hazard	Height	Built	Type	State
William J. Cole Pond De Soto	Low Hazard	15 ft	1955	Earth	Louisiana
William L. Cochran Impounding Blair	High Hazard	60 ft	1898	Earth	Pennsylvania
William Ory Dam Madison	Low Hazard	31 ft	2018	Earth	Iowa
Williams Santa Clara	Low Hazard	69 ft	1895	Gravity	California
Williams Bridge Reservoir Lackawanna	High Hazard	54 ft	1893	Earth	Pennsylvania
Williams Dam Childress	Significant Hazard	25 ft	1950	Earth	Texas
Williams Fork Main Grand	High Hazard	209 ft	1959	Concrete	Colorado
Williams Island Dam Richmond City	Unknown	7 ft	1905	Gravity	Virginia
Williams Lake Dam Van Zandt	Low Hazard	15 ft	1948	Earth	Texas
Williams Lake Dam Middlesex	High Hazard	11 ft	1882	Earth	Massachusetts
Williams Lake Dam Mills	Low Hazard	25 ft	1971	Earth	Texas
Williams Lake No 1 Dam Uvalde	Low Hazard	25 ft	1971	Earth	Texas
Williams Lake No 2 Dam Uvalde	Low Hazard	30 ft	1971	Earth	Texas
Williams Lake No 3 Dam Uvalde	Low Hazard	25 ft	1971	Earth	Texas
Williams-Mccreery Morgan	Low Hazard	51 ft	1910	Earth	Colorado
Williamson Dam Eastland	High Hazard	96 ft	1923	Buttress	Texas
Williamson Lake Dam Polk	Low Hazard	17 ft	1966	Earth	Arkansas
Williamson No. 1 El Dorado	Significant Hazard	42 ft	1926	Earth	California
William Spooner Dam Ray	Low Hazard	32 ft	2002	Earth	Missouri
Williams Reservoir Allen	High Hazard	53 ft	2012	Earth	Ohio
Williams Run Cambria	High Hazard	43 ft	1956	Earth	Pennsylvania
Williams Terminal Reservoir Dam Durham	High Hazard	—	—	Earth	North Carolina
Williamstown Lake Dam Grant	Significant Hazard	62 ft	1957	Earth	Kentucky
Williamstown Reservoir Dam Grant	Significant Hazard	40 ft	1947	Earth	Kentucky
Williamstown Reservoir Dam Berkshire	High Hazard	31 ft	1898	Earth	Massachusetts
Williams Valley Mendocino	Low Hazard	47 ft	1965	Earth	California
Willies Lake Dam Sebastian	Low Hazard	—	1942	Earth	Arkansas
Willimantic Reservoir Dam Windham	High Hazard	29 ft	1885	Concrete	Connecticut
Willisburg Lake Dam Washington	High Hazard	77 ft	1968	Earth	Kentucky
Willis Lake Dam Comanche	Low Hazard	18 ft	1969	Earth	Texas
Willis Lake Dam Highland	Low Hazard	31 ft	1995	Earth	Ohio
Willow Delta	Low Hazard	28 ft	1948	Earth	Colorado
Willoway Upground No. 5 Dam Lorain	High Hazard	12 ft	1999	Earth	Ohio
Willow Butte Harney	Low Hazard	—	2004	Gravity	Oregon
Willow Creek Jackson	High Hazard	54 ft	1953	Earth	Oregon
Willow Creek Brown	High Hazard	49 ft	1934	Earth	South Dakota
Willow Creek Yavapai	High Hazard	65 ft	1936	Arch	Arizona
Willow Hill Reservoir Sacramento	High Hazard	24 ft	—	Earth	California
Willow Lake Sanpete	Significant Hazard	—	1978	Earth	Utah
Willow Lake #1 Napa	High Hazard	40 ft	2004	Earth	California
Willow Pond Walworth	Low Hazard	8 ft	—	Concrete	Wisconsin
Willow River Cass	Low Hazard	8 ft	1962	Gravity	Minnesota
Willow Springs #1 Jefferson	High Hazard	23 ft	1963	Earth	Colorado
Willow Tank Dam Zavala	Low Hazard	8 ft	1972	Earth	Texas
Wills Point Reservoir Dam Van Zandt	High Hazard	20 ft	—	Earth	Texas
Wilmington Upground Reservoir No. 1 Clinton	High Hazard	19 ft	1945	Earth	Ohio
Wilmington Upground Reservoir No. 2 Clinton	High Hazard	31 ft	1963	Earth	Ohio
Wilmore Cambria	High Hazard	48 ft	1908	Masonry	Pennsylvania
Wilson El Paso	Significant Hazard	20 ft	1897	Earth	Colorado
Wilson #1 (Toole) Toole	Low Hazard	20 ft	1935	Earth	Montana