Evaluation of suitability and comparability of stream assessment indices using macroinvertebrate data sets from the Northern Lakes and Forests Ecoregion.

Highlights: [•] Data from multiple agencies were able to be aggregated and used for bioassessment. [•] Replicate samples showed high variability depending on index. [•] Indices were moderately correlated however varied in overall watershed assessment. [•] Locally calibrated index classified sites as higher condition than regional indices. [•] 10 years of monitoring may be required to reveal long-term natural variability. [Copyright &y& Elsevier]