Fishing on the Yellowstone has been hit or miss recently! Nymphs have been one of the best options other than the streamer. For nymphs, worms, duracell's, prince nymphs, hare's ears, copper john's, blowtorch's, masked marauder stone, Spanish perdigon, rubber legs, and Czech bombs in olive and brown have all been awesome out there recently. Streamer fishing can be awesome depending on the day as well with cloudy days being best, and with streamers the middle of the river has been better for bigger fish and the banks better for numbers. Smaller flashier streamers like the montana intruder, short shank redemption, and ditch witch have been crushing for numbers but for bigger fish we recommend fishing 4-7" stuff like sluggo's, drunk and disorderly's, dragon's, dungeon's, swim coach's, and brown/yellow munchy minnow's.
Dry Fly
Parachute Adams (16-20), Purple Haze (16-18), Buzz Ball (14-18), Corn fed Caddis (14-16), X-Caddis (14-16), Parachute bwo (16-20), Extended Body bwo (14-18), Chubby Chernobyl (12-16))
Streamer
Woolly Bugger (4-12), Ditch Witch Black/red/purple/ Yellow/white(2), Mini Peanut Envy Black/Yellow/Tan (6) Mini Dungeon Black/purple /Olive/Yellow (6), Montana Intruder (4), Sparkle Minnow JJ's/Silver/Sculpin (4-8), Double Gonga Black (4), Sculpzilla Black/White/Olive (4-8), Seasoned Geezer Gold/Natural/Olive (6)
Nymph
Pat’s Rubber Legs (6-12), Zirdle Bug (6-12), Perdigon Blue/Purple/Pearl (14-18), Jig thread Frenchie Brown/yellow (14-18), Hot head CDC Pheasant Tail (10-18), Jigster BWO (14-18), Formerly Known Prince Nymph (10-18), BH Hare's Ear (12-18), Sizzlin' Hot Squirrel (14-16), Matt’s Shagadelic Mop Tan/Brown/Chartreuse/Cheeto (10)