The Pomme de Terre watershed narrows as the River flows south through cropland and small amounts of pasture land with little to no lakes or wetlands throughout the area. Once the River reaches Appleton it flows westerly. finally emptying into Marsh Lake, an impoundment of the Minnesota River. A portion of this sub-watershed flows through Swift County where parts of its channel is well protected by forested riparian areas and deep narrow valleys. This section of the river contain impairments such as E.coli, turbidity, and low fish and macroinvertebrate diversity likely due to altered hydrology, limited habitat, and elevated nitrate levels according to the PdT Stressor ID report.
The lower section of the Pomme de Terre River was listed as impaired for dissolved oxygen until 2006 due to the Appleton Mill Dam removal in 1999. The dam removal on this section immediately provided a positive impact on oxygen levels, helped restore connection to the Minnesota River, and improved fish habitat.
A USGS Gage near Appleton, MN before the Pomme de Terre enters Marsh lake measures river height and cfs (cubic-feet per second) discharge.