Coldwater Creek Coldwater Creek SWMA - Bluffton
Analysis Summary for Series #2793
Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)
| Metric Name | Value | Score |
|---|---|---|
| MH Total Taxa | 28 | 6.78 |
| SH Total Taxa | 11.67 | 7.18 |
| MH EPT Taxa | 8 | 4.12 |
| SH EPT Taxa | 4.67 | 4.25 |
| MH Sensitive Taxa | 5 | 5.75 |
| SH Ephem % | 5.28 | 0.68 |
| SH EPT % | 19.1 | 2 |
| SH Chiron % | 34.92 | 6.58 |
| SH Scraper % | 0.32 | 0.07 |
| SH Top3Dom % | 67.81 | 6.8 |
| SH Dom FFG % | 77.2 | 3.8 |
| MHBI | 5.78 | 4.52 |
| *Mouse-over metric for full name | ||
| **Final IBI is sum of scores multiplied by 0.8333 | ||
Analysis Factors
| Factor | Value |
|---|---|
| BMIBI Type | Warm Water |
| Sample Date | 7/24/2024 |
| Sampling Series | Series #2793 |
| Drainage Area (mi2) | 22.366 |
| Log(DA) | 1.34958832056246 |
| Calculation Last Updated | 7/22/2025 3:34:58 PM |
| Sampling Gear | Hess |
Sessions used in this analysis
Warm Water
Fair
BMIBI Score Explained
This site was analyzed using the BMIBI-Warm Water assessment methodology.
Sites that score between 31 - 55 are considered fair. Total taxa richness and EPT (Ephemeroptera, Plecoptera, Trichoptera) taxa richness are noticeably reduced from optimum levels; sensitive species and habitat specialists are rare; EPT taxa are still dominant in abundance; however, the most-sensitive EPT taxa have been replaced by ept taxa that are more tolerant of organic enrichment; the community is not well-balanced; a few taxa clearly dominate in abundance, collector-gatherers or collector-filterers often comprise more than 50% of the community.
This location has been classified as a Reference Site. Reference sites represent natural stream qualities that are least disturbed by human activities within the watershed. These sites are then grouped by ecoregion to establish a benchmark against which other streams in the same ecoregion 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 | 87 |
| 75th Percentile | 78 |
| Median | 70 |
| 25th Percentile | 62 |
| Min | 52 |
| This Session's Score | 44 |
| Total Reference Site Samples | 55 |
| Mean | 70.55 |
| Standard Deviation | 9.41 |