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
1996 - 1998
Assessment Type
Integrated Report
Category 0
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 DNR ambient monthly water quality monitoring in 1998 & 1999 near Smithland in Woodbury Co.

Basis for Assessment

SUMMARY:  The Class B(WW) aquatic life uses were assessed as "fully supported."  The fish consumption uses remain "not assessed."  EXPLANATION:  The assessments of the Class B(WW) uses were based on results of monitoring during the 1998-1999 biennial period from the DNR quarterly station on the Little Sioux River northeast of Smithland in Woodbury County.   Based on the lack of violations of Class B(WW) criteria for pH, dissolved oxygen, and ammonia in the eight samples analyzed during the biennial period, and due to the lack of violations of Class B(WW) chronic criteria for toxic metals in the two samples analyzed during this period, the aquatic life uses were assessed as "fully supported."  This assessment was based on results of quarterly monitoring.   Results from stations monitored monthly or more frequently, however, are preferred for Section 305(b) assessments in order to improve the accuracy and confidence level of the assessment.   As part of DNR's expanded water quality monitoring program, monthly monitoring at the Smithland station began in October 1999.   Fish consumption uses remain "not assessed" due to the lack of fish tissue monitoring in this river reach.

Monitoring and Methods
Assessment Key Dates
230 Fixed station physical/chemical (conventional plus toxic pollutants)
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