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Riverfly Data

Riverfly Data

9083Total Samples Shown
56Trigger Level Breaches

Scores†
Average Score: 14

Count Distribution‡

Groups

Cased Caddis‡
Total: 348 | Average: 27

Caseless Caddis‡
Total: 101 | Average: 8

Mayfly (Ephemeridae)‡
Total: 87 | Average: 7

Blue-Winged Olive (Ephemerellidae)‡
Total: 164 | Average: 13

Flat-Bodied Stone Clinger (Heptageniidae)‡
Total: 170 | Average: 13

Olives (Baetidae)‡
Total: 783 | Average: 60

Stoneflies (Plecoptera)‡
Total: 72 | Average: 6

Freshwater Shrimp‡
Total: 2205 | Average: 170

†

Scores in this chart are calculated from the average monthly counts for each species group. The chart includes data derived from Urban and Extended Riverfly samples. Select a site using the map or menu bar to plot its trigger level alongside the scores.

‡

Values in this chart represent average monthly counts for each species group. The chart includes data derived from Urban and Extended Riverfly samples.