Yellow River W60 Bridge (Site 4)
Analysis Summary for Series #1272
Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)
| Metric Name | Value | Score |
|---|---|---|
| MH Sensitive Taxa | 5 | 5.56 |
| SH Dom FFG % | 48.88 | 8.2 |
| MH Total CW Taxa | 2 | 3.94 |
| MH Tricop No Hydrop | 2 | 3.1 |
| MH Tolerant % | 33.33 | 1.5 |
| SH CW % | 1.91 | 0.51 |
| SH Hydropsyche % | 0 | 10 |
| SH Hydropsychinae % | 4.39 | 9.34 |
| BTI | 6.06 | 2.36 |
| *Mouse-over metric for full name | ||
| **Final IBI is sum of scores multiplied by 1.1111 | ||
Analysis Factors
| Factor | Value |
|---|---|
| BMIBI Type | Cold Water |
| Sample Date | 9/6/2012 |
| Sampling Series | Series #1272 |
| Drainage Area (mi2) | 58.17 |
| Log(DA) | 0 |
| Calculation Last Updated | 7/22/2025 3:28:43 PM |
| Sampling Gear | Hess |
Sessions used in this analysis
BMIBI Score
49
Cold Water
Not Assigned
BMIBI Score Explained
This site was analyzed using the BMIBI-Cold Water assessment methodology.
A detailed analysis of the IBI score has not yet been determined for coldwater IBI metrics.
This location has been classified as a survey site. Survey sites are compared to reference sites within the same ecoregion. A reference site represents natural stream qualities that are least disturbed by human activities within the watershed. Reference sites are grouped by ecoregion to establish a benchmark against which these survey streams are compared.
EcoRegion Comparison
Scores for a sampling session are compared against reference sites within the same ecoregion:
Paleozoic Plateau (Driftless Area)
This site is in the Paleozoic Plateau (Driftless Area) ecoregion.
| Max | 92 |
| 75th Percentile | 76 |
| Median | 69 |
| 25th Percentile | 60 |
| Min | 42 |
| This Session's Score | 49 |
| Total Reference Site Samples | 110 |
| Mean | 68.01 |
| Standard Deviation | 11.99 |