South Raccoon River Nations Bridge Co Park- Stuart
Analysis Summary for Series #2404
Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)
| Metric Name | Value | Score |
|---|---|---|
| MH Total Taxa | 33 | 6.35 |
| SH Total Taxa | 11.67 | 5.14 |
| MH EPT Taxa | 18 | 6.67 |
| SH EPT Taxa | 9.33 | 6.35 |
| MH Sensitive Taxa | 5 | 4.55 |
| SH Ephem % | 16.71 | 2.14 |
| SH EPT % | 97.52 | 10 |
| SH Chiron % | 0.9 | 10 |
| SH Scraper % | 0.63 | 0.14 |
| SH Top3Dom % | 79.8 | 3.21 |
| SH Dom FFG % | 83.54 | 2.74 |
| MHBI | 5.2 | 6.67 |
| *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 | 7/29/2020 |
| Sampling Series | Series #2404 |
| Drainage Area (mi2) | 330.259 |
| Log(DA) | 2.51885466155403 |
| Calculation Last Updated | 7/22/2025 3:32:55 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and habitat specialists are rare; EPT taxa are still dominant in abundance; however, the most-sensitive EPT taxa have been replaced by ept taxa that are more tolerant of organic enrichment; the community is not well-balanced; a few taxa clearly dominate in abundance, collector-gatherers or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:
| Max | 86 |
| 75th Percentile | 70 |
| Median | 62 |
| 25th Percentile | 54 |
| Min | 20 |
| This Session's Score | 53 |
| Total Reference Site Samples | 120 |
| Mean | 61.41 |
| Standard Deviation | 10.8 |