| Common Name | Scientific Name / Details | Mar | Apr | May | Jun | Jul | Aug | Sep |
| Blue Wing Olives (BWO)(2) | Baetis size: 6-7 mm (#18) nymphs 3 tails (middle shorter) duns 2 tails |
--XX | XXXX | XXXX | XXXX | XXXX | ||
| Gray Drake (?) | Siphloplecton basale size: 14-16 mm (#8) nymphs 3 tails / duns 2 tails |
--X | X-- | |||||
| Hendrickson | Ephemerella subvaria size: 10-12 mm (#12) nymphs 3 tails / duns 3 tails |
--XX | XX-- | |||||
| Sulphurs / PMD | Ephemerella invaria / rotunda / excrucians size: 9-10 mm(#14) nymphs 3 tails / duns 3 tails |
--XX | X--- | |||||
| Sulphurs /PMD | Ephemerella dorothea size: 6-7 mm (#18) nymphs 3 tails / duns 3 tails |
--XX | XX--- | |||||
| Gray Drake | Siphlonurus alternatus size 12 -16 mm (#8) nymphs 3 tails duns / spinners 2 tails |
--XX | XX--- | |||||
| Little Dark Hendrickson | Ephemerella needhami size: 9-10 mm (#14) nymphs 3 tails / duns 3 tails |
---X | XX- | |||||
| Sulphur | Epeorus vitreus size 9 - 12 mm nymphs 2 tails / duns 2 tails |
---X | XX- | |||||
| March Brown / Gray Fox | Maccaffertium vicarium (formally Stenonema) size 14-16 mm (#10 2x long) nymphs 3 tails (clingers) duns 2 tails (speckled wings) |
---X | XXX- | |||||
| Armored Speckled-Wing | Baetisca laurentina size 10-12 mm (#12) nymphs 3 tails (fat body) duns 2 tails (chubby mottled wing) |
---X | XXX- | |||||
| Light Cahill | Stenacron / Maccaffertium (several species) size 9-1 mm (#12 2x long) nymphs 3 tails (clingers) duns 2 tails (speckled wings) |
XXX- | ||||||
| Darth Vader | Serratella deficiens size: 4-5 mm (#20) blackish wings pale yellow legs nymphs 3 tails / duns 3 tails |
XXX- | ||||||
| Brown Drake(1) | Ephemera simulans size 12-15 mm (#10 2x long) nymphs 3 tails (burrower) duns 3 tails (brown splotch wing) |
XXX- | ||||||
| Hex
Hatch Michigan Caddis(1) |
Hexagenia limbata size 16-35 mm (#6) nymphs 3 tails (burrower) duns 3 tails |
--XX | X--- | |||||
| Mahogany Dun | Isonychia bicolor size 13-16 mm (#8 2x long) nymphs 3 tails (swimmers) duns 2 tails |
---X | XXXX | XX-- | ||||
| Tricos | Tricorythodes minutus 3 -3 1/2 mm (#22) nymphs 3 tails duns 3 tails (blackish body) |
-XXX | ||||||
| Large Rusty Spinner(1) | Hexagenia atrocaudata size 16-30 mm (#6) nymphs 3 tails (burrower) duns 3 tails |
--XX | X--- | |||||
| Little Yellow Quill | Leucrocuta hebe size 9 - 12 mm duns 2 tails duns yellow body & orange thorax |
---X | XXX- | |||||
| White Fly(1) | Ephoron leukon size 10 - 13 mm (#12) nymphs 3 tails (burrowers) duns 2 tails (white body) |
XXX- | ||||||
| Common Name | Scientific Name / Details | Mar | Apr | May | Jun | Jul | Aug | Sep |
Notes:
(1) - indicates mayfly nymphs that burrow in sand, silt and muck. The densest
hatches for these insects will occur in those stretches of the stream.
(2) - there are several mayflies species that all fall under Blue Wing Olives (BWO) and hatch at different times during the season. Some I see are too sporatic to really get the trout's attention.