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Swift Dam (Montana)
Swift Dam (National ID # MT00581) is a dam in Pondera County, Montana, on the southern end of the Blackfeet Indian Reservation.
The original dam at this location was originally constructed around 1910, with a height of 157 feet.〔http://www.montanafilm.com/dams12.htm〕 The embankment structure gave way on June 10, 1964, after heavy rains caused flooding on Birch Creek. The dam collapsed and sent a 30-foot wall of water down the creekbed. The nearby dam at Lower Two Medicine Lake also failed, and at least 28 people were killed.〔http://www.dailyinterlake.com/news/local_montana/article_f2900040-7904-11e0-a202-001cc4c002e0.html〕
The current concrete-arch structure was completed in 1967, with a height of 205 feet, and a length at its crest of 573 feet.〔http://ce-npdp-serv2.stanford.edu/DamDirectory/DamDetail.jsp?npdp_id=MT00581〕 The reservoir is also contained by a secondary earthen dike (National ID # MT00580) with a height of 53 feet and a length of 457 feet, also completed in 1967. The dams and reservoir are owned and operated by the local Pondera Canal & Reservoir Company.〔http://ponderacanalcompany.com/about-pccrc/about-2/〕
The reservoir, Swift Reservoir, has a maximum storage capacity of 34,000 acre-feet, and normal storage of 30,000 acre-feet.〔http://ce-npdp-serv2.stanford.edu/DamDirectory/DamDetail.jsp?npdp_id=MT00581〕 Recreation is restricted to hiking in the area, with a parking area that requires Blackfeet Nation permission.
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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