
Riverfly Data
9607Total Samples Shown
69Trigger Level Breaches
Groups
Cased Caddis‡‡Total: 360 | Average: 28
Caseless Caddis‡‡Total: 97 | Average: 7
Mayfly (Ephemeridae)‡‡Total: 86 | Average: 7
Blue-Winged Olive (Ephemerellidae)‡‡Total: 137 | Average: 11
Flat-Bodied Stone Clinger (Heptageniidae)‡‡Total: 164 | Average: 13
Olives (Baetidae)‡‡Total: 732 | Average: 56
Stoneflies (Plecoptera)‡‡Total: 71 | Average: 5
Freshwater Shrimp‡‡Total: 2188 | Average: 168
†
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.