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

Invertebrate Program Statistics and Summary

Since the bioassessment program began in 1994, benthic macroinvertebrate surveys have been a critical component of the assessment process.

1,272,414
Total Invertebrates Collected
956
Unique Taxa
2,793
Total Surveys
2,605
BMIBI Assessments

Top 5 Most Collected Taxa

Taxa # Collected
Chironomidae 246,205
Cheumatopsyche 120,729
Tricorythodes 38,973
Baetis intercalaris 38,870
Hydropsychidae 36,891

Top 5 Most Common Taxa

Taxa % of all sites
Chironomidae 73.86%
Cheumatopsyche 63.03%
Hydropsychidae 57.55%
Oligochaeta 54.66%
Physa 52.78%

Valid Assessments

Assessment Type Count
Warm Water 2222
Cold Water 234
Rapid Assessment 188

BMIBI - Warm Water Scores

Stream Sample Date Score

BMIBI - Cold Water Scores

Stream Sample Date Score