The Franklin D Roosevelt Lake Watershed (HUC 17020001) covers an area of approximately 5,895 square miles in eastern Washington state. The hydrology of the watershed is dominated by the Columbia River, which runs through the area, and its tributaries. The watershed receives significant snowfall in the winter months, with the snowpack typically peaking in March. The surface water in the watershed is used for irrigation, recreation, and hydropower generation. The primary reservoir in the watershed, the Franklin D Roosevelt Lake, is used for flood control as well as power generation. The lake is also home to several fish species, including kokanee salmon and rainbow trout. The climate in the watershed is characterized by hot summers and cold winters, with precipitation primarily falling in the form of snow in the winter months. Recent trends suggest an increase in average temperatures and a decrease in snowpack, which has implications for water availability in the region.