Simpson Creek IA 01-TRK-214
mouth (S30 T95NR10W Fayette Co.) to headwaters in S36 T96N R12W Chickasaw Co.
- Cycle
- 2016
- Release Status
- Final
- Overall IR
- 3 - Insufficient data exist to determine whether any designated uses are met.
- Trend
- Unknown
- Created
- 5/6/2016 3:52:09 PM
- Updated
- 11/21/2016 2:51:04 PM
SUMMARY: The presumptive Class A1 (primary contact recreation) uses remain "not assessed" (IR 3a) due to the lack of information upon which to base an assessment. The assessment of the presumptive Class B(WW1) aquatic life uses are changed from "partially supported" (IR 3b) based on a report of a fish kill in July 2001 to “not assessed” (IR 3a). Due to the absence of kills subsequent to that kill, this assessment segment was moved from Category 4d (impaired but TMDL not required) to Category 3b (water in need of further investigation) for Iowa's 2006 Integrated Reporting cycle and is moved to IR Category 3a (“not assessed”) for the 2016 IR cycle.
EXPLANATION: The aquatic life uses remain assessed as "partially supported" due to occurrence of a fish kill. A fish kill occurred on this stream segment on July 23, 2001. The kill affected approximately 4 miles of Simpson Creek in Sections 16, 17, 21, 22, and 27 of T95N, R11W, Chickasaw Co. The kill was caused by discharge of hog manure; the responsible party was identified and restitution was sought. An estimated 32,700 fish were killed.
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 into Category 4d of Iowa's 2004 Integrated Report. IDNR considers IR 4d fish kill waters with no subsequent kills reported in at least five year subsequent to the kill as appropriate for movement from IR Category 4d to either categories 2b or 3b (i.e., Iowa’s list of waters in need of further investigation). Thus, this assessment segment was moved to Category 3b of Iowa’s 2006 Integrated Report where it remained. According to Iowa DNR’s assessment/listing methodology, any IR 2b or 3b fish kills that occurred more than 10 years ago will be moved to IR Category 3a (not assessed). Thus, this assessment is moved to IR Category 3a (“not assessed”) for the 2016 report.