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.

1,364,899
Total Invertebrates Collected
956
Unique Taxa
2,942
Total Surveys
2,754
BMIBI Assessments

Top 5 Most Collected Taxa

Taxa # Collected
Chironomidae 262,284
Cheumatopsyche 131,219
Baetis intercalaris 41,781
Tricorythodes 41,610
Hydropsychidae 39,113

Top 5 Most Common Taxa

Taxa % of all sites
Chironomidae 68.22%
Cheumatopsyche 58.44%
Hydropsychidae 53.38%
Oligochaeta 50.69%
Physa 49.18%

Valid Assessments

Assessment Type Count
Warm Water 2359
Cold Water 248
Rapid Assessment 188

BMIBI - Warm Water Scores

Stream Sample Date Score

BMIBI - Cold Water Scores

Stream Sample Date Score