Iowa DNR
ADBNet

Water Quality Assessments

Impaired Waters List

Long Dick Creek IA 03-SSK-960

mouth (S18 T85N R23W Story Co.) to N. line of S34 T86N R23W Hamilton Co.

Assessment Cycle
2000
Result Period
1996 - 1998
Designations
Assessment Type
Monitored
Integrated Report
Category 0
Legacy ADBCode
IA 03-SSK-0090_0
Overall Use Support
Partial
Aquatic Life Use Support
Partial
Documentation
Assessment Comments

1997 Biocriteria: Fish IBI=19 (poor), 39 (fair); BM-IBI= 48 (fair), 57 (good).

Basis for Assessment

The assessment was based on data collected in 1997 as part of the DNR/UHL stream biocriteria project.   A series of biological metrics which reflect stream water quality and habitat integrity were calculated from the biocriteria sampling data.   The biological metrics are based on the numbers and types of benthic macroinvertebrate taxa and fish species that were collected in the stream sampling reach.   The biological metrics were combined to make a fish community index of biotic integrity (F-IBI) and a benthic macroinvertebrate index (BM-IBI).   The indexes rank the biological integrity of a stream sampling reach on a rising scale from 0 (minimum) to 100 (maximum).

The F-IBI scores were 19 (poor) and 39 (fair) and the BM-IBI scores were 48 (fair) and 57 (good).   The aquatic life use support was assessed as partially supported (=PS), based on a comparison of the F-IBI and BM-IBI scores with biological assessment criteria established specifically for the 2000 Section 305(b) report.   The biological assessment criteria were determined from a statistical analysis of data collected at stream ecoregion reference sites from 1994-1998.

Monitoring and Methods
Assessment Key Dates
10/2/1997 Biological Monitoring
Methods
330 Fish surveys
380 Quan. measurements of instream parms-- channel morphology-- floodplain-- 1-2 seasons-- by prof
220 Non-fixed station physical/chemical monitoring (conventional pollutant only)
315 Regional reference site approach
320 Benthic macroinvertebrate surveys
Monitoring Levels
Biological 4
Habitat 4
Physical Chemistry 1
Toxic 0
Pathogen Indicators 0
Other Health Indicators 0
Other Aquatic Life Indicators 0
# of Bio Sites 2
BioIntegrity Fair