Image: Lake Lewis flood profiles

Description: Upload is a series of profiles for the Lake Lewis level reached for various flood sizes. w: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[1] from periodic cataclysmic floods from w: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 Template:Ft to m above sea level (today's sea level) before subsiding.
Title: Lake Lewis flood profiles
Credit: Last, George V.; Bruce N. Bjornstad and Byron M. Gessel (2009) Distribution of Mammoth (Mammuthus) and Erratic Finds Relative to the Size of Ice Age Floods in Southeastern Washington State, Pacific Northwest National Laboratory, PNNL-SA-68903
Author: Last
Permission: Published by the U.S. Department of Energy's Pacific Northwest National Laboratory - confirmed with their legal department that reproductin publication on Wikipedia is acceptable if cited.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No