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Riverfly Data

Riverfly Data

10099Total Samples Shown
95Trigger Level Breaches

Scores†
Average Score: 14

Count Distribution‡

Groups

Cased Caddis‡
Total: 347 | Average: 29

Caseless Caddis‡
Total: 108 | Average: 9

Mayfly (Ephemeridae)‡
Total: 97 | Average: 8

Blue-Winged Olive (Ephemerellidae)‡
Total: 131 | Average: 11

Flat-Bodied Stone Clinger (Heptageniidae)‡
Total: 140 | Average: 12

Olives (Baetidae)‡
Total: 625 | Average: 52

Stoneflies (Plecoptera)‡
Total: 67 | Average: 6

Freshwater Shrimp‡
Total: 2043 | 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.