ADBNet

This kill occurred on or before August 19, 2005, and was caused by manure discharged from a dairy feeding operation. The kill began in Section 36 of T93N, R4W and ended in Section 36 of T93N, R3W. Approximately 1.3 miles of stream were affected; South Cedar Creek, a trout stream, did not appear to have been impacted by the event. A total of 2,226 fish were killed with an estimated value of $660. The party responsible for the kill was identified, and DNR sought and received restitution for the value of the fish killed and the costs incurred by DNR in the investigation of the kill.

According to DNR's assessment methodology for Section 305(b) reporting, occurrence of a single pollution-caused fish kill during an assessment period indicates "partial support" of the aquatic life uses. If, however, a consent order has been issued to the party responsible for the kill and monetary restitution has been sought for the fish killed, the affected waterbody should be placed in IR Category 4d (impaired but TMDL not required). Thus, this assessment segment was placed in Category 4d of Iowa’s 2006, 2008, and 2010 Integrated Reports. DNR considers IR 4d fish kill waters with no subsequent kills in at least the five years subsequent to the kill as appropriate for movement to IR categories 2b or 3b (i.e., Iowa’s list of waters in need of further investigation). Thus, this 4d impairment was moved to IR Category 3b of Iowa’s 2012 Integrated Report and remains in IR Category 3b.The methodology further states that IR 4d segments without an additional kill for over 10 years should be moved to IR Category 3a (not assessed). Thus, based on the methodology, this segment should be placed in IR Category 3a.