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Riverfly Data

Riverfly Data

11399Total Samples Shown
83Trigger Level Breaches

Scores†
Average Score: 14

Count Distribution‡

Groups

Cased Caddis‡
Total: 334 | Average: 26

Caseless Caddis‡
Total: 111 | Average: 9

Mayfly (Ephemeridae)‡
Total: 116 | Average: 9

Blue-Winged Olive (Ephemerellidae)‡
Total: 120 | Average: 9

Flat-Bodied Stone Clinger (Heptageniidae)‡
Total: 136 | Average: 10

Olives (Baetidae)‡
Total: 553 | Average: 43

Stoneflies (Plecoptera)‡
Total: 64 | Average: 5

Freshwater Shrimp‡
Total: 1961 | Average: 151

†

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.