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

Callibaetis

Callibaetis ferrugineus hageni

The speckled-wing mayfly of stillwater and slow spring-creek flats. Multiple broods all summer, and a nymph that trout chase — one of the few mayflies worth stripping.

Order
Mayfly
Family
Baetidae
Genus
Callibaetis
Hook
#14-16
Season · Peak Jul-Sep, late morning
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
Callibaetis
Emergence Triggers
Water Temp
58–68°F
Flow
Stillwater edges, spring-creek sloughs
Light
Late morning, calm days
Water Type
Weedy flats, backwaters, spring creeks
Lifecycle
How Trout Eat It — Stage by Stage
1
Nymph
All summer

Agile swimmers that dart between weed beds. Strip-pause a slim nymph over weed tops.

Match It
Callibaetis Nymph#14-16
$3.15
Flashback Pheasant Tail#14-16
$2.75
2
Emerger
10am-noon

Fish cruise and sip emergers on glassy flats — lead a cruising fish by six feet and let it come.

Match It
Callibaetis Cripple#14-16
$3.15
3
Dun
Late morning

Speckled duns on flat water. Accuracy and patience beat fly choice.

Match It
Parachute Adams#14-16
$2.95
Callibaetis Comparadun#14
$3.15
4
Spinner
Midday

Spinner falls happen in daylight — speckled wings flat in the film, easy to miss and heavily eaten.

Match It
Callibaetis Spinner#14-16
$2.95
Cross-Reference
Where This Bug Matters
≋ Waterlands · Hatch data blends USGS gauges, NOAA temps & regional emergence records
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