Iowa DNR
Iowa DNR
ADBNet
Water Quality Assessments
Impaired Waters List

North Fork Long Creek IA 02-IOW-666

mouth (S26 T75N R6W Washington Co.) to confluence with unnamed tributary in SW 1/4 S1 T75N R7W Washington Co.

Assessment Cycle
2002
Result Period
1998 - 2000
Designations
Assessment Methodology
Assessment Type
Evaluated
Integrated Report
Category 0
Legacy ADBCode
IA 02-IOW-0091_1
Overall Use Support
Partial
Aquatic Life Use Support
Partial
Documentation
Assessment Comments

Assessment is based on occurrence of a fish kill in August 1999.

Basis for Assessment

[NOTE:  For the 2002 report, the previous waterbody segment for North Fork Long Creek (IA 02-IOW-0091-0), which extended 16 miles from its mouth to it headwaters, was split into two subsegments:  (1) mouth to unnamed tributary NE of Washington in S1, T75N, R7W (IA 02-IOW-0090-1) and (2) from unnamed tributary to headwaters (IA 02-IOW-0090-2).   The assessment refering to the previous 26-mile assessment segment for previous Section 305(b) reports can be found in segment IA 02-IOW-0091-1.]

SUMMARY:  The general aquatic life uses remain "partially supported."  EXPLANATION:  The previous (2000) assessment of the aquatic life uses was based on the occurrence of a fish kill near Ainsworth in August 1999 (see assessment for the 2000 report above).   According to IDNR's assessment methodology for Section 305(b) reporting, occurrence of a single pollution-caused fish kill within the most recent three-year period (1999-2001) indicates impairment of the aquatic life uses.   Because a pollution-caused fish kill occurred on this stream during the most recent three-year period, the aquatic life uses remain assessed as "partially supported."

Monitoring and Methods
Assessment Key Dates
8/1/1999 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
Organic enrichment/Low DO Overall Use Support Moderate
  • Source Unknown
  • Moderate
Unionized Ammonia Overall Use Support Moderate
  • Municipal Point Sources
  • Moderate