Big Muddy Creek IA 06-LSR-1637
mouth (S15 T96N R36W Clay Co.) to confluence with unnamed tributary in S17 T98N R35W Dickinson Co.
Assessment Comments
Assessment is based on results of IDNR/UHL biological (biocriteria) monitoring in 2001: Fish IBI=55 (good), BM-IBI=62 (good).
Basis for Assessment
SUMMARY: The Class B(LR) aquatic life uses are assessed (monitored) as "fully supported / threatened" (minor impacts) based on results of IDNR/UHL biological (biocriteria) sampling in 2001. This is the same assessment as that developed for the 2002 reporting cycle.
EXPLANATION: The assessment was based on the 2001 data and the aquatic life use support continued to be assessed as fully supported / threatened (=FST), based on a comparison of the F-IBI score [55 (good)] and BM-IBI score [62 (good)] with biological assessment criteria established specifically for the 2002 Section 305(b) report. The biological assessment criteria were determined from a statistical analysis of data collected at stream ecoregion reference sites from 1994-2001.
Assessment Key Dates
| 9/5/2001 | Biological Monitoring |
| 9/5/2001 | One-time Chemical Monitoring |
Methods
| 320 | Benthic macroinvertebrate surveys |
| 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 |
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 | 1 |
| BioIntegrity | Good |
| Causes | Use Support | Cause Magnitude | Sources | Source Magnitude |
|---|---|---|---|---|
| Other habitat alterations | Aquatic Life Support | Not Impairing |
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| Siltation | Aquatic Life Support | Not Impairing |
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