Assessment Comments
Assessment based on occurrence of fish kill in August 1999. See attached document for details.
Basis for Assessment
SUMMARY: The Class B(CW) aquatic life uses of this stream were assessed as "partially supported." EXPLANATION: A fish kill occurred on this stream reach on August 5, 1999, northwest of Highlandville in Winneshiek County. The kill followed a 2-3 inch rainfall event; no other water quality problems were observed. An estimated 3,200 fish were killed. According to DNR's assessment methodology for Section 305(b) reporting, occurrence of a single pollution-caused fish kill, or kill of unknown origin, within the most recent three-year period indicates that the aquatic life uses of a waterbody are only "partially supported." Thus, the Class B(CW) aquatic life uses of this stream were assessed as "partially supported."
