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Lake Lewis
Lake Lewis was a temporary lake in the Pacific Northwest region of North America, largely formed by the Missoula Floods in about the 14th millennium B.C.
Lake Lewis was formed when the restricted flow of waters〔Flow was restricted by a hydraulic dam—a restriction to the flow rate caused by a narrowed reach in a river valley.〕 from periodic cataclysmic floods from Glacial Lake Missoula, pluvial Lake Bonneville, and perhaps from subglacial outbursts, backed up through the constriction formed by the Wallula Gap in the Horse Heaven Hills (southern Washington). Water also backed up further downstream on the Columbia River between Washington and Oregon, delaying the drainage of Lake Lewis. The water remained for a period of weeks before the flood waters drained through Wallula Gap, just southeast of the Tri-Cities area. Lake Lewis reached an elevation of about above sea level (today's sea level) before subsiding.〔(United States Geological Service Site )〕〔(Ice Age Floods Institute site on Lake Lewis )〕
Lake Lewis also flooded the Yakima, Walla Walla, Touchet and Tucannon river valleys.
==Glacial Lake Missoula==
(詳細はglacial ages, cataclysmic floods inundated portions of the Pacific Northwest from Glacial Lake Missoula, pluvial Lake Bonneville, and perhaps from subglacial outbursts. Glacial Lake Missoula was a body of water as large as some of the USA's Great Lakes. This lake formed from glacial meltwater that was dammed by a lobe of the Canadian ice sheet. Episodically, perhaps every 40 to 140 years, the waters of this huge lake forced its way past the ice dam, inundating parts of the Pacific Northwest. Eventually, the ice receded northward far enough that the dam did not reform, and the flooding episodes ceased.
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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