Dam
Rock Island: Columbia River, WA
The Rock Island Hydroelectric Project is located near the geographical center of Washington state on the Columbia River. Development began in January, 1930; four generating units were operational in 1933. Six additional generating units were added to the…
Alder: Nisqually River, WA
Completed in 1945, the 330-foot concrete arch Alder Dam is located on the Nisqually River, approximately 38 miles southeast of Tacoma, Washington. Alder Dam is part of the Nisqually River Hydroelectric Project.
Chandler: Yakima River, WA
The Chandler Powerplant includes two 6.0 megawatt, 4160 volt hydropower generators, and two 2,600 horsepower pumps which operate from a 10.6 mile canal, diverting up to 1,500 cubic feet per second of water from the Prosser Diversion Dam.