Iowa DNR

Water Quality Assessments

Impaired Waters List

Little Sioux River IA 06-LSR-1565

from confluence with Maple R. (S17 T83N R44W Monona Co.) to confluence with Big Cr. in Anthon in S4 T87N R43W Woodbury Co.

Assessment Cycle
Result Period
2002 - 2004
Class B(WW)
Assessment Methodology
Assessment Type
Integrated Report
Category 2a
Legacy ADBCode
IA 06-LSR-0020_1
Overall Use Support
Aquatic Life Use Support
Fish Consumption
Not assessed
Assessment Comments

Assessment is based on results of IDNR/UHL ambient monthly water quality monitoring from 2002-04 near Smithland in Woodbury Co.

Basis for Assessment

SUMMARY:  The Class B(WW) aquatic life uses are assessed (monitored) as "fully supported" based on results of ambient chemical/physical water quality monitoring from 2002 through 2004.   Fish consumption uses remain "not assessed" due to the lack of recent fish contaminant monitoring in this river segment.   This assessment is based on results of IDNR/UHL monthly ambient monitoring conducted during the 2002-2004 assessment period NE of Smithland (STORET station 10970001 (formerly station 911078)).  

EXPLANATION:  Monitoring at the IDNR station near Smithland showed no violations of Class B(WW) water quality criteria for pH, dissolved oxygen (minimum value = 7.3 mg/l) or ammonia nitrogen (maximum value = 0.91 mg/l) in the 36 samples analyzed during the 2002-2004 period.   In addition, levels of pesticides in the seven samples analyzed, and levels of toxic metals in the ten samples analyzed, were all below their respective Class B(WW) criteria.   Similar to the previous assessment periods, these results suggest "full support" of the Class B(WW) aquatic life uses.    
Fish consumption uses remain "not assessed" due to a lack of recent fish contaminant monitoring in this river segment.

Monitoring and Methods
Assessment Key Dates
12/7/2004 Fixed Monitoring End Date
1/8/2002 Fixed Monitoring Start Date
230 Fixed station physical/chemical (conventional plus toxic pollutants)
Monitoring Levels
Biological 0
Habitat 0
Physical Chemistry 3
Toxic 3
Pathogen Indicators 0
Other Health Indicators 0
Other Aquatic Life Indicators 0
# of Bio Sites 0
BioIntegrity N/A