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.

1,301,512
Total Invertebrates Collected
956
Unique Taxa
2,847
Total Surveys
2,658
BMIBI Assessments

Top 5 Most Collected Taxa

Taxa # Collected
Chironomidae 252,351
Cheumatopsyche 124,110
Baetis intercalaris 39,872
Tricorythodes 39,703
Hydropsychidae 37,395

Top 5 Most Common Taxa

Taxa % of all sites
Chironomidae 70.73%
Cheumatopsyche 60.45%
Hydropsychidae 55.17%
Oligochaeta 52.43%
Physa 50.79%

Valid Assessments

Assessment Type Count
Warm Water 2267
Cold Water 242
Rapid Assessment 188

BMIBI - Warm Water Scores

Stream Sample Date Score

BMIBI - Cold Water Scores

Stream Sample Date Score