Hydroelectric Dams

2,099 dams in the US serve this purpose.

Dam Name	Hazard	Height	Built	Type	State
Stillwater Penobscot	Low Hazard	25 ft	1902	Concrete	Maine
Stillwater - North Dam Herkimer	High Hazard	55 ft	1924	Earth	New York
St Louis Gratiot	Significant Hazard	21 ft	1901	Gravity	Michigan
Stockport Mill Country Inn Water Power Project Morgan	High Hazard	20 ft	1891	Concrete	Ohio
Stockton Dam Cedar	High Hazard	—	1969	Rockfill	Missouri
Stone Dam Penobscot	High Hazard	27 ft	1900	Concrete	Maine
Stone Dam - Dike 1 Penobscot	Low Hazard	10 ft	1900	Earth	Maine
Stone Dam - Dike 2 Penobscot	Low Hazard	10 ft	1900	Earth	Maine
Stone Dam - Dike 3 Penobscot	Low Hazard	10 ft	1900	Earth	Maine
Stone Dam - Dike 4 Penobscot	Low Hazard	9 ft	1900	Earth	Maine
Stone Dam - Dike 5 Penobscot	Low Hazard	9 ft	1900	Earth	Maine
Stone Dam - Dike 6 Penobscot	Low Hazard	9 ft	1900	Earth	Maine
Stone Dam - Dike 7 Penobscot	Low Hazard	9 ft	1900	Earth	Maine
Stone Dam - Dike 8 Penobscot	High Hazard	9 ft	1900	Earth	Maine
Stony Brook Oxford	Low Hazard	12 ft	1976	Concrete	Maine
Stoughton Dane	Low Hazard	11 ft	1916	Earth	Wisconsin
Strawberry Tuolumne	High Hazard	143 ft	1916	Rockfill	California
St. Regis Falls Franklin	Low Hazard	10 ft	1947	Timber Crib	New York
Strontia Springs Douglas	High Hazard	292 ft	1982	Concrete	Colorado
Stroudwater River Cumberland	Low Hazard	16 ft	1849	Concrete	Maine
St. Stephen Powerhouse Dam Berkeley	High Hazard	128 ft	1985	Concrete	South Carolina
Stump Lake Dam Douglas	Low Hazard	17 ft	1953	Earth	Oregon
Stump Pond Penobscot	Low Hazard	12 ft	1936	Concrete	Maine
Sturgeon Falls Marinette	Low Hazard	38 ft	1906	Gravity	Wisconsin
Sturgeon Falls Dickinson	Significant Hazard	37 ft	1905	Concrete	Michigan
Sturgeon Pool Dam Ulster	High Hazard	109 ft	1922	Concrete	New York
Sturgeon River Dam Dickinson	Unknown	80 ft	1924	Gravity	Michigan
Sturgis St. Joseph	High Hazard	25 ft	1913	Buttress	Michigan
Stuyvesant Falls Columbia	Significant Hazard	13 ft	1900	Masonry	New York
Sucker Brook Diversion Addison	Significant Hazard	38 ft	1917	Earth	Vermont
Sucker Creek Dam Ontonagon	Low Hazard	15 ft	—	Earth	Michigan
Sugar Camp Oneida	Low Hazard	10 ft	1908	Gravity	Wisconsin
Sugar Hill Addison	High Hazard	60 ft	1931	Earth	Vermont
Sugar Island St. Lawrence	Low Hazard	35 ft	1925	Gravity	New York
Sugar River I Sullivan	Significant Hazard	18 ft	1928	Concrete	New Hampshire
Sugar River Ii Sullivan	Significant Hazard	10 ft	2009	Concrete	New Hampshire
Sullivan Lake Pend Oreille	High Hazard	25 ft	1923	Gravity	Washington
Summersville Dam Nicholas	High Hazard	—	1965	Rockfill	West Virginia
Sunapee Sullivan	Significant Hazard	15 ft	1856	Masonry	New Hampshire
Superior Dam Washtenaw	High Hazard	25 ft	1919	Earth	Michigan
Superior Falls Iron	Low Hazard	28 ft	1917	Gravity	Michigan
Superior Falls Iron	Low Hazard	28 ft	1935	Gravity	Wisconsin
Sutherland Lincoln	High Hazard	30 ft	1935	Gravity	Nebraska
Swan Falls Ada	High Hazard	88 ft	1901	Concrete	Idaho
Swan Lake Ketchikan Gateway Borough	High Hazard	174 ft	1984	Arch	Alaska
Swans Falls Oxford	Low Hazard	10 ft	1923	Concrete	Maine
Swanton Franklin	Low Hazard	19 ft	1920	Concrete	Vermont
Sweetwater Sullivan	Significant Hazard	33 ft	1922	Concrete	New Hampshire
Swift No. 1 Skamania	High Hazard	412 ft	1958	Earth	Washington
Swift No 2 Hydroelectric Project Cowlitz	Low Hazard	106 ft	1959	Earth	Washington