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Lake Lewis Chapter: Information about Lake LewisLake Lewis formed from hydraulic damming of flood waters behind Wallula Gap along the Horse Heaven Hills, in the state of Washington. The water remained for only a week or less before all the flood waters drained through Wallula Gap, just southeast of the Tri-Cities area.Lake Lewis reached a maximum elevation of about 1200' above sea level (today's sea level) before quickly subsiding. Lake Lewis also backflooded and filled the Yakima and Walla Walla Valleys. |
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The maximum extent of Lake Lewis. Image created by Bruce
Bjornstad, a geologist and member of the Lake Lewis Chapter.
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The image below shows the extent (depth) of flooding in the Tri-Cities area
of Washington
while inundated by Lake Lewis at its maximum extent. The image was also created
by Bruce Bjornstad.
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Last updated 08/18/2008. Contact the Webmaster.
