Wikipedia contributors. (2025, July 27). Lake Lewis. In Wikipedia, The Free Encyclopedia. Retrieved 00:59, June 14, 2026, from https://en.wikipedia.org/w/index.php?title=Lake_Lewis&oldid=1302715343
Lake Lewis (Wikipedia) Lake Lewis was a large transient lake (lasting only days to weeks) in the Pacific Northwest region of North America, formed by periodic Missoula Floods along the Columbia River paleocourse between 21,000 and 16,000 years ago.