Silver Creek IA 01-WPS-363
from Crystal Cr. (aka Clear Cr.) (S23 T81N R3E Clinton Co.) to confluence with Negro Cr. in S27 T82N R3E Clinton Co.
Assessment Comments
Assessment is based on results of (1) 1997 DNR Fisheries Bureau survey in DeWitt city park and (2) DNR 1998 Biocriteria sampling: Fish IBI= 40(fair), BM-IBI= 55(fairly good).
Basis for Assessment
SUMMARY: The Class B(LR) aquatic life uses remain assessed as "fully supported / threatened" (minor impacts). EXPLANATION: The aquatic life uses remain assessed as "fully supported / threatened" based on results of the biological monitoring conducted on this stream segment in 1997 and 1998 (see assessment for the 2000 report above). These data are less than five years old and, according to IDNR's methodology for Section 305(b) assessments, are thus appropriate for characterizing current water quality conditions.
Assessment Key Dates
| 7/22/1998 | Fixed Monitoring End Date |
| 8/1/1997 | Fixed Monitoring Start Date |
Methods
| 220 | Non-fixed station physical/chemical monitoring (conventional pollutant only) |
| 315 | Regional reference site approach |
| 320 | Benthic macroinvertebrate surveys |
| 330 | Fish surveys |
| 380 | Quan. measurements of instream parms-- channel morphology-- floodplain-- 1-2 seasons-- by prof |
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 | Fair |
| Causes | Use Support | Cause Magnitude | Sources | Source Magnitude |
|---|---|---|---|---|
| Other habitat alterations | Overall Use Support | Not Impairing |
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| Other habitat alterations | Aquatic Life Support | Not Impairing |
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| Siltation | Overall Use Support | Not Impairing |
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| Siltation | Aquatic Life Support | Not Impairing |
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