North Branch North River IA 04-LDM-1106
mouth (S35 T77N R27W. Madison Co.) to confluence with unnamed tributary in S5 T77N R29W Madison Co.
Assessment Comments
Habscrs/fshscrs=26/14, 31/12 (seine), 26/12 (shock); 1994-1997 Biocriteria: Avg. Fish IBI= 42(fair), Avg. BM-IBI= 75(good). Assessment based on 2000 biocriteria data: Fish IBI= 28 (fair), BM-IBI= 68 (good).
Basis for Assessment
The assessment was based on data collected in 2000 as part of the DNR/UHL stream biocriteria project. The 2000 Fish IBI score was 28 (fair) and the BM-IBI score was 68 (good). The aquatic life use support was assessed as fully supported / threatened (=FST), based on a comparison of the F-IBI and BM-IBI scores 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
| 7/27/2000 | Biological Monitoring |
| 7/28/1997 | Fixed Monitoring End Date |
| 7/1/1994 | Fixed Monitoring Start Date |
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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| Siltation | Overall Use Support | Not Impairing |
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| Siltation | Aquatic Life Support | Not Impairing |
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