The Peshtigo watershed (HUC 04030105) covers an area of 1,964 square miles in northeastern Wisconsin, draining into Lake Michigan. The hydrology of the area is dominated by the Peshtigo River, which flows for 120 miles through forests, wetlands, and agricultural lands before reaching its mouth at Green Bay. The region receives an average annual snowfall of 50-60 inches, with the heaviest snowpack occurring in January and February. Surface water in the watershed is primarily freshwater streams and rivers, with some smaller lakes and ponds. Reservoirs in the area are mostly small impoundments for flood control and recreation. Interesting climatic facts include the occurrence of severe thunderstorms and tornadoes in the summer months, as well as frequent lake-effect snow in the winter. Trends in the region include changes in land use, with increasing urbanization and development, as well as potential impacts from climate change, including changes in precipitation patterns and increased risk of flooding.