Iowa DNR
Iowa DNR
ADBNet
Water Quality Assessments
Impaired Waters List

Deer Creek IA 02-CED-592

from Mitchell-Worth county line (west line S6 T100N R18W Mitchell Co.) to confluence with unnamed tributary at E line of S28 T100N R19W Worth Co.

Assessment Cycle
2004
Result Period
2000 - 2002
Designations
Assessment Methodology
Assessment Type
Monitored
Integrated Report
Category 4d
Legacy ADBCode
IA 02-CED-0540_2
Overall Use Support
Partial
Aquatic Life Use Support
Partial
Documentation
Assessment Comments

Assessment is based on results of an IDNR investigation of a fish kill in April 2000.

Basis for Assessment

SUMMARY:  The Class B(LR) aquatic life uses are assessed (monitored) as "partially supported" based on occurrence of a fish kill in April 2000.   This assessment is the same as that developed for the 2002 reporting cycle.

EXPLANATION:  A fish kill occurred on this stream segment on April 6, 2000.   The kill affected 6.5 miles of Deer Creek beginning at the Iowa/Minnesota state line and extending downstream at the west line, S35, T100N, R19W, Worth County; an estimated 59,000 fish were killed.   The kill was caused by a fertilzer spill at an ag-chemical dealer in Myrtle, MN.   According to DNR's assessment methodology for Section 305(b) reporting, occurrence of a single pollution-caused fish kill during the most recent three-year period (1998-2001) indicates "partial support" of the aquatic life uses.   Thus, the Class B(LR) aquatic life uses of this stream segment were assessed as "partially supported."

Monitoring and Methods
Assessment Key Dates
4/6/2000 Fishkill
Methods
140 Incidence of spills and/or fish kills
Monitoring Levels
Biological 0
Habitat 0
Physical Chemistry 0
Toxic 0
Pathogen Indicators 0
Other Health Indicators 0
Other Aquatic Life Indicators 0
# of Bio Sites 0
BioIntegrity N/A
Causes and Sources of Impairment
Causes Use Support Cause Magnitude Sources Source Magnitude
Unionized Ammonia Aquatic Life Support Moderate
  • Spills
  • Moderate