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Rush Lake (Utah)
Rush Lake (also known as Rush Reservoir) is a shallow saline lake in Tooele County in the U.S. state of Utah. It is a remnant of Lake Bonneville, an ancient postglacial inland sea that covered much of the western United States during the Ice Ages. The lake is a natural impoundment of a stream that drains into the Great Salt Lake.〔(【引用サイトリンク】title=Utah Water Quality-Rush Lake )〕 Rush Lake varies in size, evaporating at about per year, although occasional floods refill the lake.〔 The average surface elevation is .〔(【引用サイトリンク】title=Rush Lake at FishingWorks )〕
==Geography==
The lake is located in a broad valley named Rush Valley near the town of Stockton and several miles south of Tooele, and is fed by snowmelt from six mountain ranges. These are the Sheeprock Mountains in the south, the East Tintic Mountains to the southeast, the Oquirrh Mountains to the east, South Mountain to the north, the Stansbury Mountains to the northwest and west, and the Onaqui Mountains to the southwest. The runoff from these mountain regions create only intermittent surface flow to the lake, but does reach it via groundwater seepage. The highest point in the watershed is Lowe Peak, at . The outflow mostly consists of evaporation, and a very small amount seeps through the sandspit that impounds it from the main Great Salt Lake valley.〔
The lake was isolated from Lake Bonneville approximately 15,000-17,000 years ago after evaporation lowered the lake level to below the natural Stockton Bar barrier between Rush Valley and Tooele Valley. During the ice ages, Rush Valley was merely one of many arms of Lake Bonneville. After Bonneville dried up, Rush Valley contained several pluvial lakes – Shambip, Smelter, and Rush – of which only Rush Lake remains today.
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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