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4 ¥ ¥ Kachess River – drains the eastern side of the Cascade Mountains beginning at Chickamin Ridge in the Alpine Lakes Wilderness region at an elevation of 4,857 feet then into Kachess and Little Kachess Lakes merging with the Yakima River at Lake Easton. ¥ Cle Elum River – drains the eastern side of the Cascade Mountains beginning in the 8-mile long Cle Elum Lake and merging with the Yakima River west of Cle Elum 28 miles later. Average daily streamflow is about 268 cubic feet per second (cfs) when the Dam is not releasing water. The river’s name derives from the Yakama phrase tie-el-lum meaning “swift waters”. ¥ Teanaway River – drains the eastern side of the Cascade Mountains beginning at about 5,000 feet in elevation in Teanaway Community Forest and merging with the Yakima River east of Cle Elum. Average daily streamflow is about 116 cubic feet per second (cfs). The river’s name derives from the Yakama phrase Shaptin meaning “drying place”. Floodplains Floodplains and flooded areas include alluvial soils - which are former river and stream beds, tidal pools and retention ponds, that fill during heavy rainfall, sometimes infrequently, often for extended periods during rainy seasons. There are numerous, sizable flood prone areas in the lowlands adjacent to the Yakima River mitigated by a series of dikes. Some segments along the river shoreline may be potentially affected by the floodwaters possible during the worst storm in an average 100-year period. In such instances, due to the dams and dikes, floodwater depths are shallow and not very extensive. Lakes Lakes are water bodies greater than 20 acres in size or more than 6 feet in depth. There are 4 major lakes within the Yakima and Cle Elum Rivers drainage areas: ¥ Keechelus Lake – is located at Snoqualmie Pass at an elevation of 2,521 feet with a lake surface of 2,408.5 acres. Although a