Iowa DNR
Iowa DNR
ADBNet
Water Quality Assessments
Impaired Waters List

Elk Creek IA 02-SHL-798

mouth to east line of S13 T99N R22W Worth Co.

Assessment Cycle
2002
Result Period
1998 - 2000
Designations
Assessment Methodology
Assessment Type
Evaluated
Integrated Report
Category 0
Legacy ADBCode
IA 02-SHL-0030_0
Overall Use Support
Partial
Aquatic Life Use Support
Partial
Documentation
Assessment Comments

Assessment is based on results of a DNR stream use assessment in November 1994.

Basis for Assessment

SUMMARY:  The Class B(LR) aquatic life uses remain assessed as "partially supported."  The assessment category, however, is changed from "monitored" to "evaluated."  EXPLANATION:  Continue to use the assessment developed for the 1998 report (see above) that was based on results of the 1994 IDNR stream use assessment.   However, because these data are now considered too old (greater than five years) to accurately characterize current water quality conditions, the assessment category is changed from "monitored" (indicating an assessment with relatively high confidence) to "evaluated" (indicating an assessment with relatively low confidence).   Follow-up monitoring is needed in this stream reach to determine the status of aquatic communities and habitats and to determine the degree to which the Class B(LR) uses may be impaired.

Monitoring and Methods
Assessment Key Dates
11/1/1994 Biological Monitoring
Methods
330 Fish surveys
375 Visual observation-- may not quantify some parameters-- single season-- by prof.
Monitoring Levels
Biological 2
Habitat 3
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
Other habitat alterations Overall Use Support Moderate
  • Pasture grazing - Riparian
  • Moderate
Other habitat alterations Aquatic Life Support Moderate
  • Pasture grazing - Riparian
  • Moderate