The Upper Scioto Watershed covers a land area of approximately 2,550 square miles, including portions of north-central Ohio. It is a vital source of drinking water for several communities and supports various recreational activities such as boating and fishing. The hydrology of the watershed is influenced by the topography, geology, and climate of the region. The area receives an average annual precipitation of 37 inches, with snowfall averaging around 30 inches per year. Snowpack in the region varies significantly each year, with some years experiencing heavy snow accumulation. The watershed includes several reservoirs, such as the Delaware Reservoir and Griggs Reservoir, which are used for water supply, flood control, and recreation. The composition of the reservoir water varies depending on the season and precipitation levels. The watershed is also impacted by climate change, with warming temperatures and more frequent extreme weather events affecting the region.