Iowa DNR
Iowa DNR

ADBNet

Water Quality Assessments
Impaired Waters List

West Fork Little Sioux River IA 06-LSR-1600

from confluence with Mud Cr. (S31 T89N R44W Woodbury Co.) to confluence with unnamed tributary in S3 T91N R42W Cherokee Co.

Assessment Cycle
2004
Result Period
2000 - 2002
Designations
Assessment Methodology
Assessment Type
Evaluated
Integrated Report
Category 1
Legacy ADBCode
IA 06-LSR-0130_0
Overall Use Support
Threatened
Aquatic Life Use Support
Threatened
Documentation
Assessment Comments

Assessment is based on results of an IDNR stream use assessment in October 1995 near Moville, Woodbury County.

Basis for Assessment

SUMMARY:  The Class B(LR) aquatic life uses remain assessed as "fully supported / threatened" (minor impacts) based on results of biological monitoring and habitat assessment conducted as part of an IDNR stream use assessment in 1995.   Due to the age of these data, the assessment category is changed from "monitored" (higher-confidence assessment) to "evaluated" (lower-confidence assessment).  

EXPLANATION:  Continue to use the assessment developed for the 1998 and 2000 reports that was based on results of the 1995 IDNR stream use assessment (see the assessments developed for the 1998 and 2000 reporting cycles for more information).   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).

Monitoring and Methods
Assessment Key Dates
10/1/1995 DNR Stream Use Assessment
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 Aquatic Life Support Not Impairing
  • Channelization
  • Pasture grazing - Riparian
  • Not Impairing
  • Not Impairing