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) a 1997 fish survey conducted by the IDNR Fisheries Bureau in DeWitt city park and (2) IDNR/UHL biological (biocriteria) sampling in 1998 (Fish IBI= 40(fair), BM-IBI= 55(fairly good)).
Basis for Assessment
SUMMARY: The Class B(LR) aquatic life uses remain assessed (monitored) as "fully supported / threatened" (minor impacts) based on results of (1) the 1997 fish survey conducted by the IDNR Fisheries Bureau and (2) the 1998 biological (biocriteria) sampling conducted by IDNR/UHL. This is the same assessment as that developed for the 2002 reporting cycle.
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 assessments for the 1998 and 2000 reports). 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 | Biological Monitoring |
| 7/22/1998 | One-time Chemical Monitoring |
| 8/1/1997 | Biological Monitoring |
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 | Aquatic Life Support | Not Impairing |
|
|
| Siltation | Aquatic Life Support | Not Impairing |
|
|