The Klickitat watershed covers an area of approximately 1,860 square miles in south-central Washington State. It is a headwater tributary of the Columbia River and is characterized by steep terrain, fast-moving streams, and diverse ecosystems. The watershed receives annual precipitation ranging from 20 to 100 inches, with the majority falling as snow in the winter months. Snowpack is a critical component of the hydrologic cycle and provides essential water resources for agricultural irrigation, salmon habitat, and recreational activities. The Klickitat River supports several species of Pacific salmon and steelhead, and its tributaries provide important spawning and rearing habitat. The watershed also contains several small, man-made reservoirs used for irrigation and recreation. Climate change is expected to bring warmer temperatures, reduced snowpack, and altered hydrologic regimes to the region, which may have significant impacts on the watershed's ecosystems and human communities.