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Keystone Lake is a reservoir in northeastern Oklahoma on the Arkansas and Cimarron rivers. It is located upstream about from Tulsa.〔http://www.travelok.com/listings/view.profile/id.4160 accessed 6-25-2010〕 It was created in 1968 when the Keystone Dam was completed.〔http://keystone.oktowns.com/lake_info.htm〕 The primary purposes are: flood control, hydroelectric power generation, wildlife management and recreation.〔("Keystone Lake Info." Retrieved April 22, 2012 )〕 Keystone Lake is about in size. The lake was named for the community of Keystone, which existed on the site from 1900 until 1962, when it was inundated by the waters of the lake. Construction of the lake forced the relocation of three other towns: Mannford, Oklahoma, Prue, (also known as New Prue), and Appalachia. Engineers built a levee around low-lying areas of the south and east sides of Cleveland, Oklahoma.〔 The shoreline extends for .〔("Keystone Lake Oklahoma." Accessed April 23, 2012 )〕 Two Oklahoma state parks, Keystone State Park and Walnut Creek State Park, are located along the shores of the lake offering camping, hiking and biking trails, fishing, swimming and boating opportunities. The Keystone Lake project was authorized by the Flood Control Act of 1950. It was designed and built by the Tulsa District, Army Corps of Engineers. Construction began in January 1957 and was complete for flood control purposes in September 1964. Commercial operation of the power generating facility began in May 1968. A reregulating dam, located 7.8 miles downstream of the main dam, was also completed in 1968. Cost of the project was approximately $12 million. In 1986, the re-regulating dam was removed due to public safety issues as 16 people had drowned at the dam.〔 ==Dam construction details== The dam is built of rolled earthfill material. Maximum height of the dam is above the stream bed. The total length of the dam is , including a -long concrete section. The spillway in the concrete section is wide. The non-overflow part of the concrete section includes a power intake structure. State Highway 151 crosses the dam, connecting State Highway 51 on the south with U.S. Highway 64 on the north.〔 The spillway is a gated ogee weir, wide with eighteen tainter gates, each by . Spillway capacity at the maximum pool level (elevation ) is } per second. Capacity at the top of the flood control pool level (elevation ) is per second. The spillway also has nine sluices, each by .〔 The power intake structure is between the spillway and the left non-overflow section of the dam. It includes two penstocks, each diameter and controlled by two by gates. The power generation facility includes two hydroelectric generators, each rated at 35,000 kW.〔 In September and October 1986, Keystone Lake was filled to capacity when the remnants of Hurricane Paine entered Oklahoma and dropped nearly of water into the Cimmaron and Arkansas rivers northwest of the lake, requiring the Corps of Engineers to release water downstream at a rate of per second, which made downstream flooding inevitable. As a result, a private levee in West Tulsa failed, causing more than $1.3 million in damages.〔("Setting and History: Learning the Hard Way." Accessed August 23, 2012 )〕 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「Keystone Lake」の詳細全文を読む スポンサード リンク
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