Gallatin River Fly Fishing Report - October 4, 2026

Fly Fishing Report

GALLATIN RIVER

Report
OCT 4 — 11, 2026
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Flow
345CFS
Gallatin River near Gallatin Gateway, MT
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Water Temp
—
Updated 2026-10-04
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Weather
38–83°F
Mostly Clear
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Clarity
Clear
Check post-storm
Flow is running at 345 CFS near Gallatin Gateway with a gauge height of 1.36 ft — low, clear, and technical conditions that demand precise presentations and light tippet. A warm, sunny Sunday pushing to 78°F means afternoon Baetis hatches are your best dry-fly window, with nymphing and streamers carrying the morning.
Best Time Window
  • 7 AM - 10 AM: Midge-focused nymphing in slow glassy seams and tailouts before the sun hits the water.
  • 12 PM - 4 PM: Prime Baetis hatch window — watch for rising fish in flat water and switch to dries when you see consistent surface activity.
  • 5 PM - Dusk: Streamer and caddis hour — swing streamers through deep pools and skate a CDC caddis along the banks as light fades.
Guide's Tip
From the benchWith flows at 345 CFS and gin-clear water, fish will be spooky — approach runs from downstream and stay low. During the midday Baetis window, look for rising fish in the flat tailouts below riffles and present your dry upstream with a reach cast to buy yourself a drag-free drift of at least 4-6 feet. If you're not seeing rises, run a single tungsten nymph tight to the bottom through the deeper canyon slots at a depth of 1.5x the water column — the low, clear conditions mean fish are holding deeper and tighter to structure than you'd expect. Don't overlook the last 90 minutes of light for streamer fishing; big browns are beginning their fall aggression and a sculpin pattern stripped hard through the deepest pools can produce the fish of the season.
Main Species
Brown Trout
Rainbow Trout
Westslope Cutthroat Trout
Report generated October 4, 2026 — Next update: October 11, 2026