Sny Magill Creek IA 01-YEL-430

Assessment Comments

Assessment is based on (1) results of at Sny Magill project sites monitored for water quality, fish, macroinverts, and habitat at varying frequencies and (2) DNR summary of trout reproduction.

Basis for Assessment

Used information in Seigley, et al.  (1996), "Sny Magill nonpoint source pollution monitoring project, Clayton County, Iowa:  Water Year 1994," DNR/GSB Technical Information Series 36 to assess support of aquatic life uses as FST.  Results of monitoring show that stream supports healthy communities of fish and aquatic macroinvertebrates.   Results of water quality monitoring suggest that episodes of low DO occur in stream of both the Sny Magill and Bloody Run watersheds.   The aquatic communities of these watersheds, however, appear healthy and do not indicate a WQ impact due to low DO/organic enrichment.   Causes of low DO may be related to runoff events, but issue needs further study.