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.

1,128,968
Total Invertebrates Collected
947
Unique Taxa
2,545
Total Surveys
2,357
BMIBI Assessments

Top 5 Most Collected Taxa

Taxa # Collected
Chironomidae 222,484
Cheumatopsyche 106,222
Baetis intercalaris 35,584
Tricorythodes 34,743
Simulium 33,299

Top 5 Most Common Taxa

Taxa % of all sites
Chironomidae 76.97%
Cheumatopsyche 65.81%
Hydropsychidae 59.48%
Oligochaeta 57.38%
Physa 53.4%

Valid Assessments

Assessment Type Count
Warm Water 2003
Cold Water 215
Rapid Assessment 188

BMIBI - Warm Water Scores

Stream Sample Date Score

BMIBI - Cold Water Scores

Stream Sample Date Score