Cle Elum Lake is a lake and reservoir along the course of the Cle Elum River, in Washington state USA. Cle Elum Lake is the easternmost lake of three large lakes (two are north and one is south of Interstate 90) in the Cascade Range. The middle one, Kachess Lake is also north of I-90 while the westernmost, Keechelus Lake is south of I-90.