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.

Hatching NowPale Morning Dun Green Drake Trico Sulphur Small Western Red Quill Flav Gray Drake Callibaetis Spotted Sedge Golden Stone Yellow Sally Brown Drake Pink Lady Terrestrials Scuds & Sowbugs

Encyclopedia Hatch Calendar River Fingerprints Match the Hatch Bug School

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Big Hole River

Flows, ramps & rapids →

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CFS

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Water Temp

The Fingerprint

17 tracked hatches on this water.

Fly Box for Right Now

Elk Hair Caddis #14-16

Spotted Sedge · Adult

$2.95

CDC Caddis #16

Spotted Sedge · Adult

$3.25

Parachute PMD #16-18

Pale Morning Dun · Dun

$3.25

Comparadun PMD #16

Pale Morning Dun · Dun

$3.15

Gold Chubby #8-10

Golden Stone · Adult

$3.50

Yellow Stimulator #10

Golden Stone · Adult

$3.25

Hatch Chart — Big Hole River

River-specific intensity: this water, these bugs. Click a bug for its full profile. Likelihood is seasonal — this gauge supplies no live factors.

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

Now

100%

100%

100%

100%

100%

67%

67%

67%

67%

67%

67%

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

USGS Real-time Data · Free to Start · No Credit Card