Montana ·
Gallatin River Fly Fishing Report - June 14, 2026
GALLATIN RIVER
ReportJUN 14 — 21, 2026
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Flow
—CFS
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Water Temp
—
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Weather
37–79°F
Mostly Clear
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Clarity
Clear
Check post-storm
USGS gauge data is unavailable; the Gallatin is in the tail end of runoff, dropping fast from a low-snowpack peak and clearing steadily — fish are stacked tight to the softest bank water and behind mid-river rocks. Nymphs and dark streamers are the most consistent producers as the river transitions toward prime early-summer conditions.
What's Working — Hot Flies
Tungsten Pat's Rubber Legs - Tan & Brown #6
#6
Olsen's Straggle Stone Brown Barbless #12
#12
Blowtorch - Hare's Ear #12
#12
Egan's Thread Frenchie Jig - Olive #12
#12
Roza's World Spain Perdigon Barbless #18
#18
Tungsten Split Case Nymph - PMD #20
#20
Corn-fed Caddis (CDC) Tan #20
#20
Corn-fed Caddis (CDC) Olive #20
#20
Parachute - Blue Wing Olive #22
#22
Egan's GTI Caddis - Olive #12
#12
Sculpzilla - Olive #4
#4
Coffey's CH Sparkle Minnow Sculpin #6
#6
Hatch Chart
| Insect | Size | Activity | Prime Time |
|---|---|---|---|
| Salmonfly / Golden Stonefly | #4–8 | Nymphs very active; adults sporadic near banks | Midday 11AM–3PM |
| Caddis (multiple species) | #14–20 | Heavy — best surface hatch on the river right now | Late afternoon & evening 4–7PM |
| Yellow Sally Stonefly | #12–16 | Nymphs active; adults sporadic in afternoon | Afternoon 1–5PM |
| Pale Morning Dun (PMD) | #16–20 | Early season — nymphs most effective, dries beginning | Morning 9–11AM |
| Blue-Winged Olive (BWO) | #20–22 | Sporadic — best on overcast days and valley sections | Morning & evening |
| Midge | #20–22 | Consistent in slower tailouts and eddies | Early morning 7–9AM |
Best Time Window
- Morning 9–11AM — PMD nymphs and BWO emergers in slower pools and valley flats
- Midday 11AM–3PM — Stonefly nymph rigs along cut banks; sporadic salmonfly adults near willows
- Late afternoon & evening 4–7PM — Peak caddis hatch; best dry-fly opportunity of the day
Guide's Tip
From the benchWith the Gallatin still shedding its runoff color, focus your efforts on the softest water you can find — inside bends, bank eddies, and the slack water immediately behind large boulders. Fish are not fighting current right now; they're conserving energy and ambushing food that drifts to them. Start your day with a heavy stonefly nymph rig and transition to caddis dries in the late afternoon as the hatch fires — the evening window from 4–7PM has been the most productive dry-fly opportunity on the river this week. Keep an eye on the upper canyon above Taylor Fork, which is running clearer than the lower sections and can offer a head start on dry-fly action.
Main Species
Brown Trout
Rainbow Trout
Westslope Cutthroat Trout
