Iowa DNR
BioNet
River & Stream Biological Monitoring
Fish and Benthic Macroinvertebrate Surveys
Physical Habitat Assessments

Middle River Indianola

Analysis Summary for Series #1350

Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)

Metric Name Value Score
MH Total Taxa 31 5.96
SH Total Taxa 7.33 3.23
MH EPT Taxa 13 4.81
SH EPT Taxa 6 4.08
MH Sensitive Taxa 3 2.73
SH Ephem % 34.37 4.4
SH EPT % 40.7 4.26
SH Chiron % 59.05 4.14
SH Scraper % 2.66 0.6
SH Top3Dom % 82.96 2.7
SH Dom FFG % 90.76 1.54
MHBI 6.09 3.37
*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 7/23/2012
Sampling Series Series #1350
Drainage Area (mi2) 497
Log(DA) 2.69635638873333
Calculation Last Updated 7/22/2025 3:35:14 PM
Sampling Gear ArtSub
BMIBI Score
35
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and habitat specialists are rare; EPT taxa are still dominant in abundance; however, the most-sensitive EPT taxa have been replaced by ept taxa that are more tolerant of organic enrichment; the community is not well-balanced; a few taxa clearly dominate in abundance, collector-gatherers or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 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:

Rolling Loess Prairies

This site is in the Rolling Loess Prairies ecoregion.

Ecoregion Map
Max 86
75th Percentile 70
Median 62
25th Percentile 54
Min 20
This Session's Score 35
Total Reference Site Samples 120
Mean 61.41
Standard Deviation 10.8