Four Brothers topographic map

The lake is used as a storage reservoir for the Yakima Project, an irrigation project run by the United States Bureau of Reclamation. Although a natural lake, Kachess Lake's capacity and discharge is controlled by Kachess Dam, a 115-foot (35 m) high earthfill structure built in 1912. The discharge channel for…

Average elevation: 3,576 ft

Keechelus Lake is the westernmost of three large lakes near Interstate 90 and north of the Yakima River in the Cascade Range; the other two are Kachess Lake in the middle and Cle Elum Lake to the east. After crossing nearby Snoqualmie Pass at an elevation of 3,020 feet (920 m), Interstate 90 runs along the…

Average elevation: 3,360 ft

Due to its elevation, Snoqualmie Pass experiences significantly lower temperatures than Seattle, and receives much more precipitation, much of it being snow. Snoqualmie Pass has a humid continental climate (Koppen: Dsb bordering Csb) with cold, very wet and snowy winters, and mild to warm, relatively dry…

Average elevation: 3,133 ft

Average elevation: 715 ft