The South Branch Milwaukee River Subwatershed covers an area of 167.9 square miles stretching between Milwaukee and Ozaukee County. Within the Subwatershed, the Milwaukee River runs for 48 miles between the Village of Fredonia and the Milwaukee Harbor. Land cover in the South Branch of the Milwaukee River is largely divided between urban and rural uses. The Watershed is about 51% urban, 19% agricultural, 12% grasslands, 9% forests, and 8% wetlands (WDNR 2016). However, within a 100 foot riparian buffer of streams within the Subwatershed, land cover is 24% urban, 14% agricultural, and 61% forest, grassland, or wetland, suggesting that streams in the Milwaukee River South Branch Subwatershed are generally well protected from soil particles, and other debris and pollutants entering the stream directly from overland flow.