Hydroelectric Dams

2,099 dams in the US serve this purpose.

Dam Name	Hazard	Height	Built	Type	State
Ripogenus Piscataquis	High Hazard	83 ft	1916	Concrete	Maine
Riverdale St. Croix	High Hazard	27 ft	1905	Gravity	Wisconsin
Riverdale Mills Worcester	Low Hazard	10 ft	1957	Concrete	Massachusetts
River Mill Clackamas	High Hazard	85 ft	1911	Buttress	Oregon
Rivermill Mascoma Hydro Dam Grafton	High Hazard	22 ft	1920	Concrete	New Hampshire
Riverside Coos	Low Hazard	21 ft	1970	Gravity	New Hampshire
Riverside Dam Danville	Unknown	10 ft	—	Other	Virginia
Riverview Diversion Dam Harris	Low Hazard	12 ft	1920	Masonry	Georgia
R. L. Harris Randolph	High Hazard	152 ft	1983	Gravity	Alabama
Roanoke Rapids Northampton	High Hazard	72 ft	1955	Gravity	North Carolina
Robbs Peak El Dorado	Low Hazard	50 ft	1963	Concrete	California
Roberdel Lake Dam Richmond	Significant Hazard	—	—	Concrete	North Carolina
Robert F. Henry Lock and Dam Lowndes	Significant Hazard	—	1974	Gravity	Alabama
Robert Moses - Niagara Niagara	High Hazard	97 ft	1963	Concrete	New York
Robert S. Kerr Lock and Dam Le Flore	High Hazard	75 ft	1970	Gravity	Oklahoma
Robertsville Dam Litchfield	Significant Hazard	29 ft	1887	Concrete	Connecticut
Rock Creek Plumas	High Hazard	126 ft	1950	Concrete	California
Rock Creek Placer	High Hazard	36 ft	1913	Concrete	California
Rock Island Lewis	Low Hazard	18 ft	1984	Concrete	New York
Rock Island Douglas	High Hazard	71 ft	1932	Gravity	Washington
Rockton Winnebago	Low Hazard	7 ft	1929	Rockfill	Illinois
Rockville Manitowoc	Low Hazard	14 ft	1913	Gravity	Wisconsin
Rocky Bottom Penobscot	Low Hazard	20 ft	1965	Earth	Maine
Rocky Creek-Cedar Creek Fairfield	High Hazard	117 ft	1909	Gravity	South Carolina
Rocky Gorge Upper York	Low Hazard	10 ft	1900	Concrete	Maine
Rocky Mtn Dam C Floyd	High Hazard	27 ft	1991	Earth	Georgia
Rocky Mtn Dam G Floyd	Low Hazard	46 ft	1991	Earth	Georgia
Rocky Mtn Ps Lower Main Dam Floyd	High Hazard	80 ft	1993	Gravity	Georgia
Rocky Mtn Ps Upper Dam and Fused Overpump Spillway Floyd	High Hazard	90 ft	1995	Earth	Georgia
Rocky Reach Chelan	High Hazard	118 ft	1962	Gravity	Washington
Rocky River Main Dam Litchfield	High Hazard	107 ft	1929	Other	Connecticut
Rocky River Multiple Arch Buttress Dam Abbeville	Significant Hazard	80 ft	1940	Multi-Arch	South Carolina
Rogers Mecosta	High Hazard	40 ft	1906	Gravity	Michigan
Rollins Nevada	High Hazard	228 ft	1965	Earth	California
Rollinsford Strafford	Significant Hazard	20 ft	1910	Concrete	New Hampshire
Ross Whatcom	High Hazard	540 ft	1949	Concrete	Washington
Ross Calaveras	Low Hazard	44 ft	1892	Gravity	California
Rothschild Marathon	High Hazard	27 ft	1911	Gravity	Wisconsin
Round Butte Jefferson	High Hazard	440 ft	1964	Rockfill	Oregon
Round Valley Butte	High Hazard	29 ft	1877	Earth	California
Royal Mills Kent	High Hazard	21 ft	1861	Gravity	Rhode Island
Roycroft Lake Kenai Peninsula Borough	Significant Hazard	7 ft	1979	Earth	Alaska
Roza Diversion Kittitas	Low Hazard	32 ft	1939	Concrete	Washington
Rubicon Auxiliary El Dorado	Low Hazard	13 ft	1963	Concrete	California
Rucker Lake Nevada	High Hazard	22 ft	1856	Earth	California
Ruedi Pitkin	High Hazard	291 ft	1968	Earth	Colorado
Rumford Falls Middle Dam Oxford	Significant Hazard	20 ft	1892	Timber Crib	Maine
Rumford Falls Upper Dam Oxford	High Hazard	40 ft	1918	Concrete	Maine
Run Around Penobscot	Low Hazard	15 ft	1894	Earth	Maine
Rush Meadows Mono	High Hazard	50 ft	1925	Concrete	California