Iowa DNR
Iowa DNR

ADBNet

Water Quality Assessments
Impaired Waters List

Boyer River IA 06-BOY-1509

from confluence with East Boyer R. (S10 T83N R39W Crawford Co.) to confluence with Lime Cr. near Wall Lake in SE 1/4 S22 T86N R37W Sac Co.

Assessment Cycle
1998
Result Period
1994 - 1996
Designations
Assessment Type
Monitored
Integrated Report
Category 0
Legacy ADBCode
IA 06-BOY-0030_1
Overall Use Support
Threatened
Aquatic Life Use Support
Threatened
Fish Consumption
Not assessed
Documentation
Assessment Comments

Assessment is based on results of two October 1995 DNR stream use assessments.

Basis for Assessment

Upgraded the  assessment of support of the Class B(WW) aquatic life uses from PS to FST due to a review of field sheets from the October 1995 DNR stream use assessments.   Assessments at both locations showed relatively diverse fish communities (14 spp, 3 fams and 9 spp, 4 fams) that contained the more than expected numbers of species/ genera typical of Class B(LR) streams in this region, and game fish (channel catfish) were captured at both locations.  Thus, despite the extensive channelization and other alterations to the stream corridor and aquatic habitats, this segment of the Boyer River supports the expected fish community and thus supports the Class B(WW) uses.   The primary threats to the continued support of the Class B(WW) uses are the extensive channelization, removal of riparian vegetation (primarily trees), and resultant stream bank erosion that degrades instream aquatic habitats.

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 3
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 Not Impairing
  • Bank or Shoreline Modification/Destabilization
  • Channelization
  • Removal of Riparian Vegetation
  • Not Impairing
  • Not Impairing
  • Not Impairing
Other habitat alterations Aquatic Life Support Not Impairing
  • Bank or Shoreline Modification/Destabilization
  • Channelization
  • Removal of Riparian Vegetation
  • Not Impairing
  • Not Impairing
  • Not Impairing