Wells Creek flows into Lake Pepin and the Mississippi River after passing through Frontenac State Park in Minnesota. Naturally dynamic, its flow and course have exhibited big changes over time. It runs through erosive terrain where sediment flows easily and is exacerbated by a century+ of agricultural land use. Its trout populations have been successfully re-established, but sediment concerns are rising again. The Minnesota Pollution Control Agency (MPCA) is now poised to designate Wells as impaired for aquatic life due to excess sediment.