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

Bear Creek Eden Valley Co Park - Baldwin (RMN Trend Site)

Analysis Summary for Series #2801

Benthic Macroinvertebrate Index of Biotic Integrity (BMIBI)

Metric Name Value Score
MH Total Taxa 60 10
SH Total Taxa 20.67 9.98
MH EPT Taxa 22 9.06
SH EPT Taxa 12.67 8.97
MH Sensitive Taxa 11 10
SH Ephem % 32.1 4.1
SH EPT % 50.25 5.26
SH Chiron % 20.01 8.08
SH Scraper % 20.28 4.54
SH Top3Dom % 46.98 8.46
SH Dom FFG % 46.07 8.99
MHBI 5.24 6.52
*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 9/3/2024
Sampling Series Series #2801
Drainage Area (mi2) 69.287
Log(DA) 1.84065175758609
Calculation Last Updated 7/22/2025 3:34:47 PM
Sampling Gear Hess
BMIBI Score
78
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:

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 78
Total Reference Site Samples 120
Mean 61.41
Standard Deviation 10.8