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.

Hatching NowPale Morning DunGreen DrakeTricoSulphurSmall Western Red QuillFlavGray DrakeCallibaetisSpotted SedgeGolden StoneYellow SallyBrown DrakePink LadyTerrestrialsScuds & Sowbugs
EncyclopediaHatch CalendarRiver FingerprintsMatch the HatchBug School
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Colorado River
Pumphouse to State Bridge · CO
Big Western freestone water through sage canyons. A caddis river at heart, with a dependable golden-stone summer and hopper banks by August.
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CFS
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Water Temp
The Fingerprint
Caddis-dominant biomass with strong golden stones; mayflies play a supporting role. Warm summer temps push hatches to mornings and evenings.
Fly Box for Right Now
Elk Hair Caddis #14-16
Spotted Sedge · Adult
$2.95
CDC Caddis #16
Spotted Sedge · Adult
$3.25
Dave’s Hopper #8-12
Terrestrials · Adult
$3.50
Chernobyl Ant #8-12
Terrestrials · Adult
$3.50
Gold Chubby #8-10
Golden Stone · Adult
$3.50
Yellow Stimulator #10
Golden Stone · Adult
$3.25
Hatch Chart — Colorado River
River-specific intensity: this water, these bugs. Click a bug for its full profile. Likelihood is seasonal — this gauge supplies no live factors.
≋ Waterlands · Hatch data blends USGS gauges, NOAA temps & regional emergence records
USGS Real-time Data · Free to Start · No Credit Card