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Theodore Roosevelt Dam is a dam on the Salt River located northeast of Phoenix, Arizona. The dam is high and forms Theodore Roosevelt Lake as it impounds the Salt River. Originally built between 1905 and 1911, the dam was renovated and expanded in 1989-1996. The dam is named after then-President Theodore Roosevelt. Serving mainly for irrigation water supply and flood control, the dam also has a hydroelectric generating capacity of 36 megawatts. ==History== One of the original five federal projects authorized on March 14, 1903,〔http://www.waterhistory.org/histories/reclamation/ Overview of the first 5 Reclamation Projects Retrieved on 2015-1-14〕 under the Newlands Reclamation Act of 1902, Roosevelt Dam was the first major project to be completed under the new federal reclamation program. This, the world's highest masonry dam, was started in 1906 and completed in 1911. The beginning of federal production of electric power occurred at Roosevelt Dam when Congress, in 1906, authorized the Reclamation Service to develop and sell hydroelectric power at the Salt River Project. The Reclamation Act of 1902 created the United States Reclamation Service whose purpose was to design and construct irrigation projects to aid the settlement of the arid west. Previous efforts by individuals and private irrigation companies were inadequate and often unsuccessful. With the creation of the Reclamation Service, the lead role of the federal government in developing large-scale irrigation projects was firmly established. Construction on Roosevelt Dam began in 1903 just below the confluence of Tonto Creek and the Salt River. The primary purpose of the project was to provide water storage for the Salt River Project and flood control through the Salt River Valley. The dam was finished in 1911 after several devastating floods had interrupted the construction progress in 1905. Completed at a cost of $10 million, it was the largest masonry dam in the world for its time with a height of 280 feet (84 m) and a length of 723 feet (216 m), while Roosevelt Lake was for a time the world's largest artificial reservoir. The dam was originally known as "Salt River Dam #1", it was not until 1959 that the dam and reservoir were officially named after Theodore Roosevelt. Roosevelt Dam, as originally conceived and built, was a symbol of success and a showpiece for the new agency. The dam contributed more than any other dam in Arizona to the settlement of Central Arizona and to the development of large-scale irrigation there. A secondary purpose of the dam was to generate a moderate amount of hydroelectric power. The lake created behind Roosevelt Dam, known as Lake Roosevelt, could hold more than of water. The dam was listed as a National Historic Landmark in 1963.〔(【引用サイトリンク】title=Withdrawal of National Historic Landmark Designation: Roosevelt Dam, Gila and Maricopa Counties, Arizona )〕 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「Theodore Roosevelt Dam」の詳細全文を読む スポンサード リンク
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