South Fork Iowa River Logsdon County Park- Iowa Falls
Analysis Summary for Series #2475
Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)
| Metric Name | Value | Score |
|---|---|---|
| MH Total Taxa | 32 | 6.15 |
| SH Total Taxa | 8.33 | 3.67 |
| MH EPT Taxa | 9 | 3.37 |
| SH EPT Taxa | 3 | 2.04 |
| MH Sensitive Taxa | 2 | 1.82 |
| SH Ephem % | 3.89 | 0.5 |
| SH EPT % | 13.22 | 1.38 |
| SH Chiron % | 2.67 | 9.83 |
| SH Scraper % | 75.58 | 10 |
| SH Top3Dom % | 80.28 | 3.13 |
| SH Dom FFG % | 75.58 | 4.07 |
| MHBI | 6.88 | 0.44 |
| *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 | 8/23/2021 |
| Sampling Series | Series #2475 |
| Drainage Area (mi2) | 120.775 |
| Log(DA) | 2.08197704615856 |
| Calculation Last Updated | 7/22/2025 3:37:48 PM |
| Sampling Gear | Surb |
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and habitat specialists are rare; EPT taxa are still dominant in abundance; however, the most-sensitive EPT taxa have been replaced by ept taxa that are more tolerant of organic enrichment; the community is not well-balanced; a few taxa clearly dominate in abundance, collector-gatherers or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 | 84 |
| 75th Percentile | 67 |
| Median | 59 |
| 25th Percentile | 50 |
| Min | 10 |
| This Session's Score | 39 |
| Total Reference Site Samples | 173 |
| Mean | 57.64 |
| Standard Deviation | 13.14 |