Plum Creek Plum Creek, is a 19-mile stream with poor water quality. Aquatic life habitat of Plum Creek is generally poor. Clay is the predominant substrate type with little gravel, rubble and sand present. Many of the pools that are necessary to support fish and other aquatic life have been filled in from bank erosion and upland sediment runoff. The streambanks are eroding because of the lack of stable bank protection and from frequent flooding.
Stream flow appears to be a major limiting factor for aquatic life during the summer months.
Macroinvertebrate sample results indicate poor to good water quality with very significant to some organic pollution present. Macroinvertebrate abundance and diversity appears to be limited by the lack of suitable habitat. The water is generally very turbid, which limits light penetration for desirable rooted aquatic plants. Filamentous algae, however, appears to be common on the rocks and along the banks. Suspended solids, total and dissolved phosphorus and bacteria levels were excessively high during runoff event sampling.