Iowa DNR
Iowa DNR
ADBNet
Water Quality Assessments
Impaired Waters List

Dalton Lake IA 01-MAQ-25

Jackson County S34T84NR5E 1 mi. SE of Preston.

Assessment Cycle
1992
Result Period
1988 - 1990
Designations
Assessment Type
Evaluated
Integrated Report
Category 0
Legacy ADBCode
IA 01-MAQ-01110-L_0
Overall Use Support
Partial
Aquatic Life Use Support
Partial
Documentation
Assessment Comments

Basis for Assessment

Support of the Class B(CW) aquatic life uses was assessed as PS due to impacts of high levels of nutrients delivered to the lake in agricultural nonpoint source runoff; siltation from agricultural nonpoint sources was identified as a secondary problem.

Causes and Sources of Impairment
Causes Use Support Cause Magnitude Sources Source Magnitude
Nutrients Aquatic Life Support High
  • Agriculture
  • High
Siltation Aquatic Life Support Moderate
  • Agriculture
  • High
Pesticides Aquatic Life Support Slight
  • Agriculture
  • High