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

Bluebell Creek Millville

Analysis Summary for Series #1626

Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)

Metric Name Value Score
MH Total Taxa 37 10
SH Total Taxa 6.67 6.12
MH EPT Taxa 14 10
SH EPT Taxa 2.33 3.22
MH Sensitive Taxa 5 8.42
SH Ephem % 0.62 0.08
SH EPT % 5.04 0.53
SH Chiron % 69.58 3.07
SH Scraper % 0 0
SH Top3Dom % 91.53 2.94
SH Dom FFG % 91.51 1.41
MHBI 6.16 3.11
*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 6/10/2013
Sampling Series Series #1626
Drainage Area (mi2) 5.745
Log(DA) 0.759290033024304
Calculation Last Updated 7/22/2025 3:27:17 PM
Sampling Gear ArtSub
BMIBI Score
41
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and habitat specialists are rare; EPT taxa are still dominant in abundance; however, the most-sensitive EPT taxa have been replaced by ept taxa that are more tolerant of organic enrichment; the community is not well-balanced; a few taxa clearly dominate in abundance, collector-gatherers or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 Candidate Reference Site. Further study is required to determine if this site represents natural stream qualities that are least disturbed by human activities within the watershed.

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.

Ecoregion Map
Max 87
75th Percentile 78
Median 70
25th Percentile 62
Min 52
This Session's Score 41
Total Reference Site Samples 55
Mean 70.55
Standard Deviation 9.41