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Jamestown Dam : ウィキペディア英語版 | Jamestown Dam
The Jamestown Dam is a rolled-earth dam spanning the James River in Stutsman County in the U.S. state of North Dakota, serving the primary purpose of flood control. It is located north of the city of Jamestown, North Dakota. Built from April 1952 to September 1953, the dam measures long at the crest and high. It impounds the James River to form the Jamestown Reservoir. A small islet lies shortly upstream of the dam, where the James River previously split into two channels. The dam and reservoir rest on a wide plain of shale where the James River cut a canyon up to wide and deep. The shale (called Pierre Shale) has a dark gray, bedded appearance, and is mostly claystone or siltstone. The valley also contains many traces of alluvium, mainly deposited during the last ice age when the area was heavily glaciated. ==Construction==
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「Jamestown Dam」の詳細全文を読む
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