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.

1,029,171
Total Invertebrates Collected
943
Unique Taxa
2,349
Total Surveys
2,161
BMIBI Assessments

Top 5 Most Collected Taxa

Taxa # Collected
Chironomidae 206,350
Cheumatopsyche 96,543
Baetis intercalaris 31,536
Simulium 30,868
Tricorythodes 29,842

Top 5 Most Common Taxa

Taxa % of all sites
Chironomidae 77.86%
Cheumatopsyche 66.34%
Hydropsychidae 59.26%
Oligochaeta 57.94%
Physa 52.02%

Valid Assessments

Assessment Type Count
Warm Water 1829
Cold Water 201
Rapid Assessment 188

BMIBI - Warm Water Scores

Stream Sample Date Score

BMIBI - Cold Water Scores

Stream Sample Date Score