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.

1,124,241
Total Invertebrates Collected
949
Unique Taxa
2,536
Total Surveys
2,348
BMIBI Assessments

Top 5 Most Collected Taxa

Taxa # Collected
Chironomidae 221,783
Cheumatopsyche 105,810
Baetis intercalaris 35,310
Tricorythodes 34,457
Simulium 33,267

Top 5 Most Common Taxa

Taxa % of all sites
Chironomidae 79.32%
Cheumatopsyche 67.77%
Hydropsychidae 61.23%
Oligochaeta 59.21%
Physa 55.01%

Valid Assessments

Assessment Type Count
Warm Water 1994
Cold Water 215
Rapid Assessment 188

BMIBI - Warm Water Scores

Stream Sample Date Score

BMIBI - Cold Water Scores

Stream Sample Date Score