Kittitas Conservation Trust will implement restoration actions to reverse the annual dewatering and the resultant adverse impacts to a threatened population of Bull Trout. The Upper Kachess River drains a 28.5 square km high mountain watershed in the Cascade Mountains of Northern Kittitas County (WRIA 39) and contributes cold, clean, high quality water to the Upper Yakima River system via Little Kachess Lake and the Lake Kachess reservoir. Restoration actions will employ natural fluvial processes to reverse the decline in population. Bull Trout were listed as threatened under the Endangered Species Act in 1998. Headwater sub-populations of Bull Trout within the Upper Yakima basin are often isolated from one another on a local and regional scale due to the construction of dams without fish passage in the early part of the 20th century. Many of these adfluvial Bull Trout populations, including the Upper Kachess population, persist at chronically low levels and are at high risk of local extirpation.