Three Forkson Gallatin River
River flow last 30 days
What's working on Gallatin River
- 01October Caddis (Dry) #6-10: Essential for imitating the large, migrating adults of this significant fall hatch. Dead-drift these through slower runs and eddies.
- 02Blue-Winged Olive Comparadun #18-22: Crucial for selective feeders keying on the dense BWO hatches. Present these with delicate casts to rising fish in softer water.
- 03Mahogany Dun #14-18: To accurately match the emerging Mahogany Dun mayflies, often found alongside BWOs.
- 04Hopper #6-10: For lingering terrestrial opportunities. Target shady banks and slower current seams where these larger insects might fall into the water.
- 05Woolly Bugger (Olive) #4-8: A highly versatile streamer, perfect for swinging through deeper runs or stripping aggressively to entice larger, more predatory trout.
- 06Anglers should focus their efforts throughout the Gallatin River, paying particular attention to the productive waters of the Gallatin Canyon, from Big Sky downstream towards Four Corners. This section offers excellent pocket water and abundant access from numerous national forest pull-offs. In the lower valley sections between Bozeman and Gallatin Gateway, concentrate on the deeper riffles, slower runs, and shaded banks where both emerging insects and terrestrials are likely to be found. Look for active feeding lanes and current seams.
- 07Tactical tip for this week: Consider running a dry-dropper rig with an October Caddis or Hopper as your lead dry fly, trailing a Flashback Pheasant Tail Nymph (#14-18) or a Zebra Midge (#20-22). This allows you to prospect both the surface and subsurface effectively, increasing your chances of connecting with the Gallatin's hungry trout.
What to tie on at Three Forks
Picked from recent reports for this stretch.
San Juan Worm
Explicitly recommended in recent angler reports and highly effective when the Gallatin River is off-color due to runoff, mimicking aquatic worms washed into the system.
Buy at AmazonOctober Caddis (Dry)
Matches the prolific fall October Caddis hatch, a significant food source for trout.
Buy at AmazonMini Dungeon
Explicitly recommended in recent angler reports as an effective streamer for covering water and enticing aggressive strikes in high, cold runoff conditions on the Gallatin River.
Parachute BWO
Explicitly recommended in recent angler reports for consistent Blue-Winged Olive hatches, proving effective when fish are looking up in softer water during spring.
Sculpzilla
Explicitly mentioned in recent angler reports as an effective streamer for targeting aggressive trout, imitating baitfish and sculpins in the current high, off-color conditions.
Pat's Rubber Leg
Explicitly recommended in recent angler reports as a dark, weighted stonefly nymph, highly effective for getting down to fish in high, off-color spring flows on the Gallatin.
Blue-Winged Olive (BWO) Comparadun
Matches the active fall Blue-Winged Olive hatches, a key dry fly opportunity for selective trout.
Buy at AmazonWater Walker
Mimics large foam dries and attractor patterns that aggressive Westslope Cutthroat are keying into in wilderness sections. Sizes 8-12.
Mahogany Dun
Matches the beginning fall hatches of Mahogany Duns, providing another important dry fly option.
Buy at AmazonMontana season by season
What changes on the water through the year, with the flies for each season.
Fly shops nearby
Local flies, current advice and guided trips.