The South Fork of the Iowa River drains a 215,000-acre watershed in northcentral Iowa dominated by agricultural land uses. There are a number of swine-producing facilities in the area, plus several farm operations that include cattle grazing. In order to understand the water quality dynamics of a large watershed that contains a range of livestock operations, the National Soil Tilth Lab (USDA-ARS), with support from the National Pork Board, has been monitoring water quality and conducting watershed assessments in the South Fork since 2000. This project supported several activities to assess best management practices in the watershed, and monitor water quality. These activities have
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