The Ontonagon watershed (HUC 04020102) covers an area of approximately 2,230 square miles in the Upper Peninsula of Michigan. The watershed is home to numerous streams and rivers, including the Ontonagon River, which flows into Lake Superior. The area receives significant amounts of snowfall, with an average annual snowfall of around 200 inches. The snowpack plays an important role in the hydrology of the region, with snowmelt contributing to spring runoff and the recharge of groundwater. Surface water in the watershed is influenced by a variety of factors, including land use practices and natural processes. Reservoirs in the watershed contain constituents such as sediment, nutrients, and organic matter that can affect water quality. Interesting climatic facts and trends in the region include the increasing frequency and severity of extreme weather events, such as heavy precipitation and high winds.