Bigalks Creek IA 01-UIA-284

Assessment Comments

Assessment is based on a 2002 summary of trout reproduction in Iowa streams prepared by the DNR Fisheries Bureau. See attached document for details.

Basis for Assessment

SUMMARY:  The Class B(CW) coldwater aquatic life uses were assessed as "fully supported / threatened" (minor impacts).   Fish consumption uses remain "not assessed."  EXPLANATION:  Based on a summary of trout reproduction in Iowa streams prepared by the DNR Fisheries Bureau, the Class B(CW) uses were assessed as "fully supported / threatened."  According to Moeller (1999), Bigalks Creek is in the category of Iowa trout streams that have at least some documented natural reproduction but that are generally unable to maintain a viable trout population at this time.   Recent water quality improvements at Bigalks Creek have resulted from a private/state/federal cooperative project in the watershed of Bigalks Creek.   Implementation of riparian buffers, filter strips, livestock fencing, and streambank stabilization has improved both water quality and the quality of aquatic habitats in Bigalks Creek.   Recent (1999) fish surveys have shown a large increase in the number of trout supported in this stream and have documented natural reproduction of rainbow trout.   Fish consumption uses remain "not assessed" due to lack of recent fish tissue monitoring in this stream reach.