I know of 2 lost lakes. One is northeast of wauconda in okanogan county and the other is southwest of shelton in pierce county. if it's either one i can give you info, i have a book that has the majority of the lakes/rivers in washington

what kind a fish do these lake have and mabey i could go test it out im going out this summer to go find some high mountian lakes with my mom boyfriend its gonna be a adventure hes found over 30 lake so far