Wikipedia contributors. (2025, November 24). Pratt Lake (Washington). In Wikipedia, The Free Encyclopedia. Retrieved 10:09, May 17, 2026, from https://en.wikipedia.org/w/index.php?title=Pratt_Lake_(Washington)&oldid=1323879978
Pratt Lake (Washington) (Wikipedia) Pratt Lake, called Ollie Lake in older maps, is a freshwater lake located on a prominent valley at the eastern skirt of Pratt Mountain, in King County, Washington…