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

Sulphur

Ephemerella dorothea dorothea

The East’s marquee evening mayfly — butter-yellow duns that own the last two hours of light from the Pennsylvania limestoners through the Catskills and north. Not a Western hatch: out West the same evening niche belongs to the PMD.

Order
Mayfly
Family
Ephemerellidae
Genus
Ephemerella
Hook
#16-18
Season · Peak Late May-Jun evenings
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
Sulphur
Emergence Triggers
Water Temp
55–64°F
Flow
Stable early-summer flows
Light
Late afternoon into dusk
Water Type
Riffle tailouts, smooth glides
Lifecycle
How Trout Eat It — Stage by Stage
1
Nymph
May-Jul

Crawler nymphs drift in the hour before the evening emergence — tighten up your nymph rig as the light drops.

Match It
Pheasant Tail#16-18
$2.75
Sulphur Nymph#16
$3.15
2
Emerger
Last 2 hours of light

Fish porpoise on emergers in the glides. A yellow cripple in the film out-fishes the dun three to one.

Match It
Sulphur Cripple#16-18
$3.15
Sparkle Dun#16
$3.15
3
Dun
Dusk

Pale yellow duns on smooth water — long leaders, downstream presentations, gentle sips.

Match It
Sulphur Parachute#16-18
$3.25
Comparadun Sulphur#16
$3.15
4
Spinner
Dark

The spinner fall happens at last light — if fish keep rising after you cannot see, it is spinners.

Match It
Sulphur Spinner#16-18
$2.95
Cross-Reference
Where This Bug Matters

Not yet linked to any Waterlands river.

Waterlands · Hatch data blends USGS gauges, NOAA temps & regional emergence records
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