Waterlands
River Intelligence · Entomology

Read the Water. Match the Hatch.

Every river has an entomological fingerprint — the bugs it grows, when they hatch, and how trout eat them. Learn the bugs, cross-reference live flows, and fill your box before you go.

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Mayfly
Hatching Now

Green Drake

Drunella grandis

The big green mayfly that makes big fish lose their minds. Short, intense, and famously hard to time — hit it right and every large trout in the river looks up.

Order
Mayfly
Family
Ephemerellidae
Genus
Drunella
Hook
#10-12
Season · Peak Jun-early Jul
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
Green Drake
Emergence Triggers
Water Temp
50–58°F
Flow
Dropping limb of runoff
Light
Cloudy afternoons, evenings
Water Type
Medium riffles, moderate gradient
Lifecycle
How Trout Eat It — Stage by Stage
1
Nymph
2 weeks pre-hatch

Chunky crawler nymphs migrate before emergence. Fish a heavy olive nymph tight to the bottom.

Match It
Drake Nymph#10-12
$3.25
Poxyback Drake#12
$3.50
2
Emerger
Hatch onset

Emergence is slow and vulnerable — big fish eat emergers with violent, confident takes.

Match It
Drake Cripple#10-12
$3.50
3
Dun
Afternoon-evening

No subtlety required. Big foam or hair-wing drakes get eaten even in fast water.

Match It
Green Drake Wulff#10-12
$3.75
Hairwing Drake#10
$3.75
4
Spinner
Dusk

Less important than the dun — but a big rusty spinner picks off stragglers at dark.

Match It
Drake Spinner#10-12
$3.25
Cross-Reference
Where This Bug Matters
Waterlands · Hatch data blends USGS gauges, NOAA temps & regional emergence records
USGS Real-time Data · Free to Start · No Credit Card