
Riverfly Data
9042Total Samples Shown
56Trigger Level Breaches
Groups
Cased Caddis‡‡Total: 346 | Average: 27
Caseless Caddis‡‡Total: 101 | Average: 8
Mayfly (Ephemeridae)‡‡Total: 87 | Average: 7
Blue-Winged Olive (Ephemerellidae)‡‡Total: 161 | Average: 12
Flat-Bodied Stone Clinger (Heptageniidae)‡‡Total: 170 | Average: 13
Olives (Baetidae)‡‡Total: 780 | Average: 60
Stoneflies (Plecoptera)‡‡Total: 72 | Average: 6
Freshwater Shrimp‡‡Total: 2206 | 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.