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Cushman Dam No. 1 is a hydroelectric dam on the North Fork of the Skokomish River in Mason County, Washington forming Lake Cushman. It was built by Tacoma City Light (now Tacoma Power) in 1924-1926. Tacoma's demand for electricity grew rapidly after World War I. Tacoma City Light’s Nisqually River Hydroelectric Project, built in 1912, could not meet the demand and the utility decided to build a new hydroelectric project on the North Fork Skokomish River. The dam and powerhouse first began to deliver electricity on February 12, 1926.〔(【引用サイトリンク】publisher= HistoryLink.org )〕 It has a concrete arch design and includes 90,000 cubic yards (69,000 m³) of concrete, covering a whole 6,244 feet (1903 m) of water. Two 21,600 kilowatt generators provide 127 million kilowatt-hours annually to the Tacoma Power system. Construction began on July 7, 1924, under the commissioner Ira S. Davidsson (1918–1940). It has a top width of eight feet (2.4 m) and a base width of 50 feet (15 m), at 275 feet (84 m) high and 1,111 feet (339 m) long. The transmission of electricity to Tacoma, over lines crossing Tacoma Narrows, was activated, or "formally energized", on March 23, 1926, with the push of a button by President Calvin Coolidge in a ceremony at the White House.〔(【引用サイトリンク】publisher= Tacoma Power )〕 A second, smaller dam, Cushman Dam No. 2, was completed by December 1930. ==See also== *Cushman Dam No. 2 *National Register of Historic Places listings in Mason County, Washington 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cushman Dam No. 1」の詳細全文を読む スポンサード リンク
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