Fall fishing has been great over on the Gallatin, and should continue to stay productive as we slowly move into winter. Nymphing has been the most consistent, but streamer fishing and dries have been good on overcast days and afternoons. For nymph rigs try a Wooly Bugger, Backflop Jig, or Pats Rubber Legs and follow it up with your favorite small dropper like a Perdigon, Zebra Midge, or Duracel. For dry flies, think Parachute Adams, midge patterns, in (18-22) and maybe a small Stubby Chubby to use as a sighter for the teeny dries. For streamers it's had to beat a sparkle minnow, small sculpin pattern, or a mini dungeon. If you like to fish the bigger stuff, try a Barely Legal or a Humdinger.
Dry Fly
Adams (16-22), Purple Haze (16-20), Sparkle Dun (16-22), Stubby Chubby Purple, Cinnamon, Yellow, Tan (12-18)
Streamer
Woolly Bugger Olive, Black (6-12), Sculpzilla Tan,Black,Olive (4-8), Beldar Brown,Black,Olive (6-8), GD P/Jig Streamer (10), Dungeon Black/ White/ Brown/ (2), Mini Dungeon Purple/ Natural/ White (6)
Nymph
Perdigon (14-18), Pat’s Rubber Legs (8-12), Hell Razor Leech (12), Hare’s Ear (16-20), Black Blowtorch (12-18), Juju Baetis (18-20), Zebra Midge Black/ Red/ Purple (16-22), Worms, Eggs, Mops