Western Montana Fly Fishing Report
Current Restrictions and Closure Summary
Montana FWP currently lists no hoot-owl restrictions on our core western Montana rivers.
- Blackfoot River: Closed to floating from Weigh Station Fishing Access Site downstream to the point where the river crosses beneath Interstate 90 because of railway bridge construction.
- Rock Creek: Closed to fishing from boats or vessels July 1 through November 30. Plan on wade fishing only.
- Bitterroot, Clark Fork, and West Fork: No current emergency angling closures affecting our normal fishing areas were listed when this report was prepared.
- Check before heading out: Emergency closures can change. Verify current Montana FWP information before every trip.
Regional River Conditions Overview
The regional rivers are settling into clear, stable fall conditions. Flows continue to recede slowly following September's rain, but the Bitterroot, Blackfoot, Clark Fork, and Rock Creek remain in good fishing shape. The West Fork has dropped considerably and is becoming more technical.
Cold mornings are now the biggest scheduling factor. Overnight lows are dropping into the upper 30s and low 40s, with an especially cold Monday morning. Do not expect prime surface activity immediately after sunrise. Give the water time to warm and focus on the late-morning through afternoon window.
Sunday's clouds and possible shower offer the best BWO and streamer setup early in the week. Tuesday's cloud cover may provide another good dry-fly window. Wednesday through Saturday look brighter overall, favoring October Caddis, remaining terrestrials, dry-droppers, and careful nymphing until clouds or wind soften the light.
Bitterroot River
Conditions
The Bitterroot is clear, settling, and firmly in an early-fall pattern. Latest verified readings are around 375 CFS near Darby, 479 CFS at Bell Crossing, and 995 CFS near Missoula. The river has less volume than it carried during the early-September rain bump, but flows remain workable throughout the system.
Expect fish to become increasingly selective in slower water. The upside is a strong fall hatch mix. October Caddis are active, BWOs matter during clouds and damp weather, and Mahogany Duns and Hecubas are becoming increasingly important. Hoppers, ants, and beetles remain useful, particularly during warmer afternoons.
Where to Fish
- Riffle edges and transitions into deeper green water
- Foam lines and soft inside seams
- Tailouts and slicks when fish are rising
- Undercut and grassy banks during warmer afternoons
- Side channels with enough depth and current
- Deep shelves and shaded buckets for streamer fishing
How to Fish It
- Start later and let the river warm before expecting consistent dry-fly activity
- Watch the water before casting in slicks and tailouts
- Fish BWOs during clouds, drizzle, and cooler periods
- Carry October Caddis adults and pupa
- Fish Mahogany Duns and Hecubas as those hatches continue developing
- Use ants, beetles, and smaller hoppers during warmer afternoons
- Run Frenchies, Perdigons, Pheasant Tails, or caddis pupa under a larger dry
- Streamer fish banks, shelves, and deeper seams when light conditions soften
Top Patterns
- BWO dry or emerger, size 18–22
- Mahogany Dun, size 14–16
- Hecuba / Fall Drake, size 10–12
- October Caddis adult or pupa, size 8–12
- Elk Hair Caddis or X-Caddis, size 14–18
- Ant, beetle, or hopper, size 8–18
- Olive, black, or tan streamer
Blackfoot River
Conditions
The Blackfoot near Bonner is around 612 CFS on the latest verified reading. The river is lower and more defined than it was earlier in September, so fish will be concentrated in the better holding water rather than spread along every bank.
This is becoming a true fall Blackfoot program. October Caddis, BWOs, Mahoganies, Hecubas, nymphs, and streamers deserve more attention, although ants, beetles, and the occasional hopper remain worth fishing on warm afternoons.
Where to Fish
- Willow-lined banks with depth
- Boulder pockets and current breaks
- Riffle edges
- Deeper buckets
- Inside seams
- Shaded shelves below heavier current
How to Fish It
- Carry October Caddis adults and pupa as primary fall patterns
- Fish BWOs during cloudy and damp periods
- Use Mahoganies and Hecubas when larger fall mayflies appear
- Prospect remaining terrestrials along warmer banks
- Drop Frenchies, Perdigons, Pheasant Tails, or caddis pupa beneath a dry
- Streamer fish buckets, boulders, and soft bank seams
- Plan all floats around the Weigh Station closure
Top Patterns
- October Caddis adult or pupa, size 8–12
- BWO dry or emerger, size 18–22
- Mahogany Dun, size 14–16
- Hecuba, size 10–12
- Ant, beetle, or hopper, size 8–18
- Zirdle or Rubber Legs, size 8–10
- Olive, black, tan, or white streamer
Clark Fork River
Conditions
The Clark Fork is around 1,460 CFS above Missoula and approximately 2,450 CFS below Missoula on the latest verified readings. The river is clear, stable, and carrying enough water to keep fish comfortable in riffles, foam lines, current tongues, side channels, and deeper green lanes.
The Clark Fork remains one of the best rivers for patient dry-fly anglers. BWOs are the main small mayfly to watch during cloudy periods. October Caddis are active, and Mahogany Duns and Hecubas should continue becoming more important as October begins.
Where to Fish
- Riffle edges
- Foam lines
- Current tongues
- Long inside seams
- Tailouts and slicks
- Side-channel seams
- Deeper green lanes
How to Fish It
- Spend time watching before casting in slower water
- Use BWOs during cloudy or damp periods
- Carry Mahogany Duns and Hecubas for larger fall mayfly activity
- Fish October Caddis adults or pupa around riffles and bank water
- Continue using ants, beetles, and smaller hoppers on warmer afternoons
- Nymph Frenchies, Perdigons, Pheasant Tails, and caddis pupa when fish are not rising
- Streamer fish shelves, soft banks, and inside seams
Top Patterns
- BWO dry or emerger, size 18–22
- Mahogany Dun, size 14–16
- Hecuba, size 10–12
- October Caddis, size 8–12
- Ant, beetle, or hopper, size 8–18
- Frenchie or Perdigon, size 14–20
- Small to medium sculpin or baitfish streamer
Rock Creek
Conditions
Rock Creek near Clinton is around 286 CFS on the latest verified reading. The creek is clear, cool, and in classic fall wade-fishing shape. Flows are considerably lower than the early-September rain bump, so stealth and careful presentations matter again.
Rock Creek's fall hatch transition is well underway. October Caddis, BWOs, Mahoganies, Hecubas, smaller caddis, and streamers are increasingly important. Terrestrials are still worth carrying along grassy banks and brushy edges, especially during warm afternoons.
Where to Fish
- Pocket water and boulder cushions
- Riffle drops
- Plunge pools
- Shaded banks and undercuts
- Soft seams behind faster water
- Deeper pockets during streamer conditions
How to Fish It
- Start later and let the creek warm before expecting strong surface activity
- Use October Caddis or larger attractor dries through broken water
- Fish BWOs during cooler cloud cover
- Carry Mahoganies and Hecubas
- Use Frenchies, Perdigons, Pheasant Tails, and caddis pupa as droppers
- Streamer fish plunge pools, undercuts, and deeper pockets
- Move slowly and fish likely water before stepping into it
Top Patterns
- October Caddis, size 8–12
- BWO, size 18–22
- Mahogany Dun, size 14–16
- Hecuba, size 10–12
- Ant, beetle, or hopper, size 8–18
- Frenchie or Perdigon, size 14–20
- Small olive or black streamer
West Fork of the Bitterroot
Conditions
The West Fork near Conner is around 196 CFS on the latest verified reading. That is a noticeable drop from earlier September levels and makes this a much more technical smaller-water fishery.
There is still good fishing available, but anglers should expect clear water, spooky fish, and limited depth. Longer leaders, lighter tippet, and careful wading will matter.
Where to Fish
- Deeper riffle edges
- Protected tailouts
- Inside seams
- Foam lines beside structure
- Deeper pockets below wood and boulders
- Shaded banks with enough depth
How to Fish It
- Use longer leaders and lighter tippet in soft water
- Carry Hecubas and Mahogany Duns
- Fish October Caddis or attractor dries through riffles
- Use ants and beetles during warmer afternoon periods
- Fish Perdigons, Pheasant Tails, and Frenchies below a dry
- Try small olive or black streamers through the deepest pockets
- Make the first cast count before wading into productive water
Top Patterns
- Hecuba, size 10–12
- Mahogany Dun, size 14–16
- October Caddis, size 8–12
- BWO, size 18–22
- Ant or beetle, size 12–18
- Perdigon or Pheasant Tail, size 14–18
- Small olive streamer
Planning Note
Sunday: Cool, overcast conditions with a possible afternoon shower make this the best BWO and streamer day at the front of the week. Start later and fish through the afternoon.
Monday: A very cold morning followed by a comfortable afternoon. Do not rush out early. The better fishing should happen after the water warms.
Tuesday: Mostly cloudy and mild. This could be another good BWO, Mahogany, October Caddis, and streamer day.
Wednesday and Thursday: Brighter and comfortable. Focus on October Caddis, remaining terrestrials, dry-droppers, and careful nymphing.
Friday: Warmer than the rest of the week. Terrestrials may get a short encore, especially ants and beetles.
Saturday: Comfortable fall weather. Expect a balanced October Caddis, dry-dropper, nymph, and streamer program.
The overall strategy: sleep in a little, let the river warm, watch before casting, and be prepared to switch between October Caddis, fall mayflies, dry-droppers, and streamers as light conditions change.
River Flow Snapshot – September 27, 2026
These are the latest numerical readings independently verified when this report was prepared. Most were recorded September 25–26. Gauge values are provisional and may change.
| River | Section | Gauge | Latest Verified Flow | Status |
|---|---|---|---|---|
| Bitterroot | Upper | Near Darby (12344000) | 375 CFS | Clear / Technical Fall Water |
| Bitterroot | Middle | Bell Crossing nr Victor (12350250) | 479 CFS | Good Fall Shape |
| Bitterroot | Lower | Near Missoula (12352500) | 995 CFS | Clear / Stable Early-Fall Flow |
| Blackfoot | Lower | Near Bonner (12340000) | 612 CFS | Lower / Defined Holding Water |
| Clark Fork | Upper | Above Missoula (12340500) | 1,460 CFS | Solid Early-Fall Flow |
| Clark Fork | Lower | Below Missoula (12353000) | 2,450 CFS | Healthy Fall Flow |
| Rock Creek | Lower | Near Clinton (12334510) | 286 CFS | Clear / Wade Fishing Only |
| West Fork Bitterroot | Lower | Near Conner (12342500) | 196 CFS | Low / Technical |
Flows are settling into classic late-September levels. The Bitterroot and Clark Fork remain in good overall shape, while Rock Creek and especially the West Fork are becoming increasingly technical as flows decline.
Fly Box of the Week
Dry Flies
- BWO dry / emerger, size 18–22
- Mahogany Dun, size 14–16
- Hecuba / Fall Drake, size 10–12
- October Caddis, size 8–12
- Elk Hair Caddis, size 14–18
- Ant, size 12–18
- Beetle / hopper, size 8–16
Nymphs
- Frenchie, size 14–18
- Perdigon, size 14–20
- Pheasant Tail, size 14–20
- BWO nymph, size 18–22
- Caddis pupa, size 12–18
- October Caddis pupa, size 8–12
- Jigged Hare’s Ear, size 14–18
Streamers
- Thin Mint
- Sculpzilla
- Sparkle Minnow
- Woolly Bugger
- Mini Dungeon
- Small olive sculpin
- Black or tan streamer
Hatch and Fly Chart – October Transition Edition
| Hatch / Insect | Activity | Best Time | Recommended Fly | Size |
|---|---|---|---|---|
| BWOs | One of the most important fall hatches during clouds and damp weather | Late morning through afternoon | BWO dry, emerger, or nymph | 18–22 |
| October Caddis | Active and increasingly important across the region | Late morning, afternoon, and evening | October Caddis adult or pupa | 8–12 |
| Mahogany Duns | Building as October approaches | Late morning through afternoon | Mahogany dry, cripple, or emerger | 14–16 |
| Hecubas | Worth carrying, especially on broken water | Late morning through afternoon | Hecuba, Brindlechute, or rusty mayfly | 10–12 |
| Small Caddis | Still present around riffles and soft seams | Variable | Elk Hair Caddis, X-Caddis, pupa, or soft hackle | 14–18 |
| Terrestrials | Fading but still productive on warm afternoons | Afternoon | Ant, beetle, or hopper | 8–18 |
The fall hatch menu is taking control. October Caddis, BWOs, Mahogany Duns, and Hecubas should get more attention than they did even a week ago. Do not completely retire the terrestrial box yet, especially with Friday's warmer forecast, but it no longer needs to run the whole operation.
Gear Picks of the Week
Fall Dry-Fly Box
BWOs, Mahogany Duns, Hecubas, October Caddis, smaller caddis, ants, and beetles now make up the core dry-fly selection.
Long Leaders and 4X–6X Tippet
Clear fall water and selective feeding fish reward careful presentations. Keep longer leaders and fine tippet ready for slicks and tailouts.
Streamer Box
Fall streamer fishing is becoming increasingly reliable. Carry olive, black, tan, and lighter baitfish patterns so you can adjust to light and water clarity.
Strategy and Expectations This Week
The Bitterroot remains the best overall local choice. It provides the widest combination of October Caddis, fall mayflies, dry-droppers, remaining terrestrials, and streamer opportunities.
The Clark Fork remains the best option for patient dry-fly anglers. Slow down, watch the water, and target individual feeding fish rather than blindly covering water.
Rock Creek remains the best wade-fishing choice. Expect clear technical water, pocket fishing, October Caddis, fall mayflies, and small streamers.
The Blackfoot is increasingly a true fall fishery. October Caddis, nymphs, and streamers deserve more attention, while the Weigh Station floating closure remains the major planning consideration.
The West Fork has become substantially more technical. Low flows mean anglers need to focus on deeper pockets and use stealth, longer leaders, and careful presentations.
