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Riverfly Data

Riverfly Data

10220Total Samples Shown
97Trigger Level Breaches

Scores†
Average Score: 14

Count Distribution‡

Groups

Cased Caddis‡
Total: 378 | Average: 29

Caseless Caddis‡
Total: 117 | Average: 9

Mayfly (Ephemeridae)‡
Total: 105 | Average: 8

Blue-Winged Olive (Ephemerellidae)‡
Total: 138 | Average: 11

Flat-Bodied Stone Clinger (Heptageniidae)‡
Total: 147 | Average: 11

Olives (Baetidae)‡
Total: 695 | Average: 53

Stoneflies (Plecoptera)‡
Total: 75 | Average: 6

Freshwater Shrimp‡
Total: 2300 | Average: 177

†

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.