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 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.
Cle Elum Lake is part of the Columbia River basin, as the Cle Elum River is a tributary of the Yakima River, which is a tributary to the Columbia River.
The lake is used as a storage reservoir for the Yakima Project, an irrigation project run by the United States Bureau of Reclamation.
Wikipedia https://en.wikipedia.org/wiki/Cle_Elum_Lake
Coordinates 47°17'16.737" N -121°6'6.937" E