
Riverfly Data
8635Total Samples Shown
52Trigger Level Breaches
Groups
Cased Caddis‡‡Total: 374 | Average: 29
Caseless Caddis‡‡Total: 101 | Average: 8
Mayfly (Ephemeridae)‡‡Total: 93 | Average: 7
Blue-Winged Olive (Ephemerellidae)‡‡Total: 134 | Average: 10
Flat-Bodied Stone Clinger (Heptageniidae)‡‡Total: 193 | Average: 15
Olives (Baetidae)‡‡Total: 781 | Average: 60
Stoneflies (Plecoptera)‡‡Total: 69 | Average: 5
Freshwater Shrimp (Gammarus)‡‡Total: 2203 | Average: 169
†
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.