Iowa DNR
ADBNet

Water Quality Assessments

Impaired Waters List

Volga River IA 01-VOL-289

mouth (S36 T92N R4W Clayton Co.) to confluence with Cox Cr. in S21 T92N R5W Clayton Co.).

Assessment Cycle
1996
Result Period
1992 - 1994
Designations
Assessment Type
Monitored
Integrated Report
Category 0
Legacy ADBCode
IA 01-VOL-0010_1
Overall Use Support
Not supporting
Aquatic Life Use Support
Threatened
Fish Consumption
Not assessed
Primary Contact Recreation
Not supporting
Documentation
Assessment Comments

Assessment is based on results from DNR monthly monitoring station near Elkport, Clayton County.

Basis for Assessment

Had one violation of chronic criterion for NH3-N in 36 samples over three years (=FST); had 7 of 14 non-runoff samples that exceeded the Class A WQC for fecal coliform bacteria; thus primary contact recreation uses should be assessed as NS.

Monitoring and Methods
Assessment Key Dates
Methods
230 Fixed station physical/chemical (conventional plus toxic pollutants)
420 Water column surveys (e.g. fecal coliform)
Monitoring Levels
Biological 0
Habitat 0
Physical Chemistry 3
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
Pathogens Overall Use Support High
  • Source Unknown
  • High
Pathogens Primary Contact Recreation High
  • Source Unknown
  • High