Iowa DNR
Iowa DNR
ADBNet
Water Quality Assessments
Impaired Waters List

Clear Lake Marsh IA 02-WIN-838

Cerro Gordo County S6T96NR21W at N edge of Clear Lake

Assessment Cycle
1998
Result Period
1994 - 1996
Designations
Assessment Type
Evaluated
Integrated Report
Category 0
Legacy ADBCode
IA 02-WIN-00370-L_0
Overall Use Support
Not supporting
Aquatic Life Use Support
Not supporting
Fish Consumption
Not assessed
Documentation
Assessment Comments

Assessment based on surveys by IDNR Wildlife Bureau.

Basis for Assessment

Comments of DNR Wildlife biologist indicate that the flow diversion structure is not functioning properly and poor hydrological characteristics are contributing to poor wetland quality.  B(LW) uses support downgraded to NS.

Monitoring and Methods
Assessment Key Dates
Methods
120 Surveys of fish and game biologists/other professionals
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
Siltation Overall Use Support High
  • Agriculture
  • Flow Regulation/Modification
  • Natural Sources
  • High
  • Moderate
  • Slight
Siltation Aquatic Life Support High
  • Agriculture
  • Flow Regulation/Modification
  • Natural Sources
  • High
  • Moderate
  • Slight