Hydroelectric Dams

2,099 dams in the US serve this purpose.

Dam Name	Hazard	Height	Built	Type	State
Markland Locks and Dam Gallatin	Significant Hazard	—	1964	Concrete	Kentucky
Marmet Locks and Dam Kanawha	Significant Hazard	—	1934	Concrete	West Virginia
Marseilles Power Canal Dam LaSalle	Low Hazard	15 ft	1911	Gravity	Illinois
Marshall Madison	Low Hazard	37 ft	1911	Gravity	North Carolina
Marshfield No. 6 Washington	High Hazard	48 ft	1927	Earth	Vermont
Mars Hill Aroostook	Low Hazard	14 ft	1900	Concrete	Maine
Martin Tallapoosa	High Hazard	168 ft	1926	Gravity	Alabama
Martindale Gin Dam Guadalupe	Low Hazard	10 ft	1892	Rockfill	Texas
Martis Creek Dam Nevada	High Hazard	93 ft	1972	Earth	California
Marys Lake Dike No. 1 Larimer	High Hazard	29 ft	1948	Earth	Colorado
Masonry Dam King	High Hazard	—	1914	Arch	Washington
Massena Intake St. Lawrence	High Hazard	115 ft	1958	Concrete	New York
Mathis & Terrora Rabun	High Hazard	113 ft	1925	Buttress	Georgia
Matrullas Dam Orocovis	High Hazard	120 ft	1934	Earth	Puerto Rico
Mattaceunk Penobscot	High Hazard	45 ft	1939	Concrete	Maine
Ma Wade Dam Gonzales	Low Hazard	11 ft	1914	Gravity	Texas
Max Starcke Dam Burnet	Significant Hazard	99 ft	1951	Gravity	Texas
Mayfield Lewis	High Hazard	200 ft	1963	Arch	Washington
Mayfield Plunge Pool Barrier Lewis	Low Hazard	14 ft	1963	—	Washington
Mayo Rockingham	Low Hazard	14 ft	1898	Gravity	North Carolina
Mcadenville Gaston	Low Hazard	8 ft	1888	Masonry	North Carolina
Mcalpine Locks and Dam Jefferson	Significant Hazard	—	1964	Concrete	Kentucky
Mccloud Shasta	High Hazard	255 ft	1965	Earth	California
Mc Clure Marquette	High Hazard	46 ft	1919	Earth	Michigan
Mcindoes Grafton	Low Hazard	25 ft	1931	Concrete	New Hampshire
Mckays Point Diversion Tuolumne	Significant Hazard	242 ft	1989	Arch	California
McNary Lock and Dam Benton	High Hazard	—	1954	Concrete	Oregon
Mcphee Montezuma	High Hazard	295 ft	1983	Rockfill	Colorado
Mcswain Mariposa	High Hazard	97 ft	1966	Rockfill	California
Meadow Lake Nevada	Low Hazard	38 ft	1855	—	California
Meadow Lake Alpine	Low Hazard	74 ft	1903	Rockfill	California
Mechanic Falls Androscoggin	Low Hazard	15 ft	1866	Masonry	Maine
Mechanicsville Windham	Low Hazard	18 ft	1900	Masonry	Connecticut
Mechanicville Rensselaer	Significant Hazard	26 ft	1900	Concrete	New York
Medina Aqueduct Dam Orleans	Significant Hazard	21 ft	1967	Concrete	New York
Medway Penobscot	Low Hazard	35 ft	1922	Concrete	Maine
Melton Hill Dam Loudon	High Hazard	60 ft	1963	Concrete	Tennessee
Menasha Dam Allegan	High Hazard	22 ft	1886	Gravity	Michigan
Menominee Menominee	Low Hazard	24 ft	1924	Concrete	Wisconsin
Menomonie Dunn	High Hazard	42 ft	1848	Gravity	Wisconsin
Menomonie Dunn	High Hazard	37 ft	1957	Gravity	Wisconsin
Merced Falls Merced	High Hazard	43 ft	1901	Concrete	California
Merrill Lincoln	Low Hazard	23 ft	1913	Gravity	Wisconsin
Merritts Mill Pond Dam Jackson	Low Hazard	25 ft	1934	Earth	Florida
Merwin Cowlitz	High Hazard	313 ft	1931	Arch	Washington
Messalonskee Lake Kennebec	High Hazard	14 ft	1992	Concrete	Maine
Methuen Falls Essex	Significant Hazard	23 ft	1895	Masonry	Massachusetts
Meyers Falls Stevens	Low Hazard	21 ft	1961	Gravity	Washington
Michigamme Falls Iron	High Hazard	72 ft	1953	Concrete	Michigan
Middle Appleton Outagamie	Low Hazard	11 ft	1930	Gravity	Wisconsin