Hydroelectric Dams

2,099 dams in the US serve this purpose.

Dam Name	Hazard	Height	Built	Type	State
Lochmere Belknap	Low Hazard	11 ft	1910	Masonry	New Hampshire
Lock Piscataquis	Low Hazard	15 ft	1875	Timber Crib	Maine
Lock 24 Dam Erie Canal Onondaga	High Hazard	21 ft	1908	Masonry	New York
Lock 29 Dam Barge Canal Wayne	Low Hazard	23 ft	1912	Concrete	New York
Lock 33 Dam Erie Canal Monroe	High Hazard	40 ft	1908	Concrete	New York
Lock 4 - Stillwater Rensselaer	Significant Hazard	5 ft	1955	Concrete	New York
Lock C-12 Washington	Significant Hazard	21 ft	1911	Other	New York
Lock E10 Cranesville Montgomery	Low Hazard	15 ft	1910	Other	New York
Lock E11 Amsterdam Montgomery	Low Hazard	12 ft	1910	Other	New York
Lock E12 Tribes Hill Montgomery	Low Hazard	11 ft	1910	Other	New York
Lock E13 Randall Montgomery	Low Hazard	8 ft	1910	Other	New York
Lock E14 Canajoharie Montgomery	Low Hazard	8 ft	1910	Other	New York
Lock E-17 Dam At Little Falls Herkimer	Significant Hazard	60 ft	1982	Other	New York
Lock E8 Scotia Schenectady	Low Hazard	14 ft	1910	Other	New York
Lock E9 Rotterdam Junction Schenectady	Low Hazard	15 ft	1910	Other	New York
Locke Mills Oxford	Significant Hazard	15 ft	1870	Concrete	Maine
Lockhart West Canal Embankment Union	High Hazard	20 ft	1920	Earth	South Carolina
Lockport Lock and Controlling Works Will	High Hazard	—	1933	Concrete	Illinois
Lockville Chatham	Low Hazard	13 ft	1922	Gravity	North Carolina
Lockwood Kennebec	Low Hazard	17 ft	1919	Concrete	Maine
Locustville Pond Washington	High Hazard	15 ft	1885	Other	Rhode Island
Logan First Dam Cache	High Hazard	—	1914	Buttress	Utah
Logan Martin St. Clair	High Hazard	97 ft	1964	Gravity	Alabama
Logan No. 3 Cache	Low Hazard	32 ft	1924	Concrete	Utah
Log Cabin Yuba	High Hazard	53 ft	1969	Arch	California
Loiza Dam Trujillo Alto	High Hazard	95 ft	1954	Gravity	Puerto Rico
London Locks and Dam Kanawha	Significant Hazard	—	1934	Concrete	West Virginia
Long Lake Stevens	High Hazard	213 ft	1915	Gravity	Washington
Long Lake Dam City and Borough of Juneau	Low Hazard	—	1973	Concrete	Alaska
Longley Inyo	Low Hazard	27 ft	1910	Earth	California
Long-On-Deerskin Vilas	Low Hazard	10 ft	1908	Gravity	Wisconsin
Long Pond Somerset	Low Hazard	12 ft	1918	Concrete	Maine
Long Pond Penobscot	Low Hazard	14 ft	1949	Concrete	Maine
Long Pond Hancock	Significant Hazard	8 ft	1930	Stone	Maine
Long Sault St. Lawrence	High Hazard	104 ft	1958	Concrete	New York
Long Shoals Lake Dam Lincoln	Low Hazard	—	1901	Other	North Carolina
Long Valley Mono	High Hazard	126 ft	1941	Earth	California
Lookout Point Dam Lane	High Hazard	249 ft	1953	Earth	Oregon
Lookout Shoals Catawba	High Hazard	88 ft	1915	Gravity	North Carolina
Loon Lake Piscataquis	Low Hazard	17 ft	1914	Concrete	Maine
Loon Lake Auxiliary El Dorado	Significant Hazard	90 ft	1963	Rockfill	California
Lost Creek Butte	High Hazard	112 ft	1924	Concrete	California
Loud Iosco	High Hazard	40 ft	1913	Gravity	Michigan
Lowell Dodge	Low Hazard	16 ft	1905	Gravity	Wisconsin
Lowell Tannery Penobscot	Low Hazard	27 ft	1987	Concrete	Maine
Lower Afton Lincoln	Low Hazard	30 ft	1942	Earth	Wyoming
Lower Baker Skagit	High Hazard	285 ft	1927	Arch	Washington
Lower Balsam Lake Polk	Significant Hazard	38 ft	1860	Gravity	Wisconsin
Lower Bear Amador	High Hazard	245 ft	1952	Rockfill	California
Lower Blue Lake Alpine	Low Hazard	40 ft	1885	Earth	California