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Willamette River At Crystal Lake

Macroinvertebrate data: 05-22-2019



School: Avery House Nature Center: Nature School Class

Date and time: May 22, 2019, 2 p.m.

Water quality: Poor

Number of people sorting/identifying: 9

Water type:

Time spent sorting/identifying: 30 minutes

Weather:

Percent EPT: 25.93%

Note: EPT is the total number of caddisflies, mayflies, and stoneflies found divided by number of all bugs

Sensitivity to pollution
Sensitive
Count
Caddisfly
5
Mayfly
30
Riffle beetle
0
Stonefly
0
Water penny
0
Dobsonfly
0
Sensitive total
6
Somewhat Sensitive
Count
Clam/mussel
0
Crane fly
0
Crayfish
0
Damselfly
0
Dragonfly
0
Scud
0
Fishfly
0
Alderfly
0
Mite
0
Somewhat sensitive total
0
Tolerant
Count
Aquatic worm
0
Blackfly
0
Leech
0
Midge
0
Snail
100
Mosquito larva
0
Tolerant total
1