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

Wapsipinicon River Twin Ponds Park

Analysis Summary for Series #2394

Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)

Metric Name Value Score
MH Total Taxa 46 8.85
SH Total Taxa 15 6.61
MH EPT Taxa 20 7.41
SH EPT Taxa 11 7.48
MH Sensitive Taxa 11 10
SH Ephem % 52.41 6.7
SH EPT % 85.86 8.99
SH Chiron % 3.53 9.75
SH Scraper % 28.94 6.47
SH Top3Dom % 57.23 6.79
SH Dom FFG % 43.09 9.48
MHBI 5.05 7.22
*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 9/16/2020
Sampling Series Series #2394
Drainage Area (mi2) 161.926
Log(DA) 2.20931658778948
Calculation Last Updated 7/22/2025 3:31:37 PM
Sampling Gear ArtSub
BMIBI Score
80
Warm Water
Excellent

BMIBI Score Explained

This site was analyzed using the BMIBI-Warm Water assessment methodology.

Sites that score between 76 - 100 are considered excellent. High numbers of taxa present, including sensitive species, EPT taxa are diverse and dominate the community in terms of abundance; habitat and trophic specialists (e.g., Scraper organisms) are present in good numbers, all of the major functional feeding groups (FFG) are represented, with no particular FFG that is excessively dominant. The community has good balance in terms of the abundance of organisms in each taxon.

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:

Iowan Surface

This site is in the Iowan Surface ecoregion.

Ecoregion Map
Max 91
75th Percentile 75
Median 66
25th Percentile 57
Min 23
This Session's Score 80
Total Reference Site Samples 162
Mean 65.27
Standard Deviation 12.31