North Skunk River IA 03-NSK-858
from confluence with Middle Cr. (S35 T76N R14W Mahaska Co.) to the Mahaska/Poweshiek county line.
Assessment Comments
Assessment is based on 1996 biocriteria sampling: fish, 22 spp., 4 fams.; Fish IBI= 36(fair), BM-IBI= 53(fair).
Basis for Assessment
SUMMARY: The Class B(LR) aquatic life uses remain assessed as "fully supported / threatened" (minor impacts). The assessment category, however, is changed from "monitored" to "evaluated." EXPLANATION: Continue to use the assessment developed for the 1998 report (see above) that was based on results of the 1996 IDNR biocriteria assessment. However, because these data are now considered too old (greater than five years) to accurately characterize current water quality conditions, the assessment category is changed from "monitored" (indicating an assessment with relatively high confidence) to "evaluated" (indicating an assessment with relatively low confidence).
Assessment Key Dates
| 10/7/1996 | 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 | 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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