Today's Read
Cold morning water temperatures on the Gallatin mean trout are holding deep and feeding primarily on subsurface nymphs and larvae rather than looking up.
Big Sky to Gallatin Gateway, Montana
Best Flies For Gallatin River
Dead drift along riffle seams and drop-offs where trout hold in cold water.
Forecast timing & sources
- Forecast generated
- Sep 14, 2026, 7:00 AM MDT
- Valid until
- Sep 15, 2026, 7:00 AM MDT
- Source updated
- Sep 14, 2026, 7:00 AM MDT
- Flow observation
- Observed Sep 14, 2026, 6:30 AM MDT
- Water temperature observation
- Observed Sep 14, 2026, 6:30 AM MDT
Buggin combines river and weather signals into a fishing forecast. A rating is model guidance, not a catch guarantee. Observation times can differ from forecast generation.
Configured gauge: Gallatin River above Deer Creek, near Big Sky · 06043120. The forecast point may differ from the gauge location.
Bugs & Best Matches
What's active
Fish this
Baetis, size #16-#20, Midday (10:00 AM–2:00 PM)
Pheasant Tail, size #16-#20, dry; Sparkle Dun, size #16-#20, dry; RS2, size #16-#20, dry
Midges, size #18-#22, Midday (10:00 AM–2:00 PM)
Zebra Midge, size #18-#22, dry; Griffiths Gnat, size #18-#22, dry; CDC Midge Pupa, size #18-#22, dry
Caddis, size #14-#18, Midday (10:00 AM–2:00 PM)
Elk Hair Caddis, size #14-#18, dry; Caddis Pupa, size #14-#18, dry; A Pascals Caddis Pupa, size #14-#18, dry
Stoneflies, size #10-#14, Variable
No matching fly supplied
Terrestrials, size #12-#16, Variable
No matching fly supplied
How To Fish These Flies
- Dead drift along riffle seams and drop-offs where trout hold in cold water.
- Use Double nymph rig under a high-vis indicator.
- Favor Weighted beadheads, slender profiles, natural body colors.
Current Conditions
Flow246 cfs and rising
Water Temp50°F
WeatherPartly Cloudy
Rating6/10 · Fair
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