Western Montana Fly Fishing Report
Late-Fall Fishing Update
The regional program has officially shifted from fall fishing toward early-winter fishing.
Trout are beginning to consolidate into deeper, slower water. BWOs and midges now matter more than October Caddis, and nymphing and streamer fishing are becoming the most dependable techniques. The good news is that the middle of the day can still fish very well, especially when clouds and precipitation improve BWO activity.
Current Restrictions and Regulations
Montana FWP currently lists no emergency fishing or hoot-owl restrictions on the Bitterroot, Blackfoot, Clark Fork, Rock Creek, or West Fork Bitterroot.
- Blackfoot River: The construction-related floating closure below Weigh Station has been lifted.
- Rock Creek: Fishing from boats or vessels remains prohibited through November 30. Wade fishing only.
- Western District: The general river and stream season remains open through November 30 unless a specific water has an exception.
- Fall reminder: Watch for active spawning gravel and give visible redds plenty of room.
Regional River Conditions Overview
The regional flow bump from last week is receding. The lower Bitterroot is around 916 CFS, the Blackfoot is near 655 CFS, the Clark Fork below Missoula is around 2,500 CFS, and Rock Creek is roughly 292 CFS.
That still leaves more usable water than we had through much of October, but the rivers are settling and clearing. Trout are increasingly leaving faster fall water and moving into deeper inside seams, buckets, eddies, foam lines, and slower winter holding water.
The November program is straightforward: there is very little reason to rush the morning. Fish deeper with nymphs or streamers until late morning, then watch carefully for BWOs and midges. On larger rivers like the Clark Fork, the better dry-fly activity may not begin until early or mid-afternoon.
Mahogany Duns and October Caddis are fading rapidly. Keep a few in the box, but BWOs, midges, subsurface mayflies, stonefly nymphs, worms, and streamers deserve most of the attention now.
Bitterroot River
Conditions
The Bitterroot has settled after last week's flow increase. Latest verified readings are approximately 240 CFS near Darby, 520 CFS at Bell Crossing near Victor, and around 916 CFS near Missoula.
The upper river remains low and technical. The middle and lower Bitterroot continue to offer more forgiving depth and better late-fall holding water.
Where to Fish
- Deep inside seams
- Soft riffle transitions
- Foam lines
- Slow tailouts
- Deep buckets
- Wood and structure with slower water nearby
How to Fish It
- Start late and concentrate on deeper, slower water
- Nymph Frenchies, Perdigons, Pheasant Tails, Duracells, and BWO nymphs
- Watch for BWOs during cloudy afternoon periods
- Fish Zebra Midges and other small midge patterns through slow foam lines
- Use longer leaders and fine tippet when fish begin rising
- Fish streamers slowly through buckets, wood, drop-offs, and soft banks
- Treat October Caddis as a secondary pattern rather than the main program
Top Patterns
- BWO dry / emerger, size 18–22
- Griffith's Gnat, size 18–22
- Zebra Midge, size 18–22
- Frenchie, size 14–18
- Perdigon, size 16–20
- Pheasant Tail, size 16–20
- Duracell, size 14–18
- Olive, black, or white streamer
Blackfoot River
Conditions
The Blackfoot near Bonner is around 655 CFS. Trout are increasingly occupying deeper winter-style water rather than the faster banks and riffles that produced earlier in the fall.
Cloudy conditions can still produce short but productive afternoon BWO windows. Nymphing and streamer fishing remain the primary techniques through most of the day.
Where to Fish
- Deep buckets
- Slow boulder seams
- Inside bends
- Riffle drop-offs
- Soft shelves
- Deep banks with reduced current
How to Fish It
- Nymph deeper during the colder part of the day
- Use Rubber Legs, TJ Hookers, Zirdles, or worms as the lead fly
- Trail Frenchies, Duracells, Pheasant Tails, or BWO nymphs
- Fish 4–6 feet deep when trout are holding in winter buckets
- Watch for BWO risers during cloudy afternoons
- Fish streamers deep with a sink tip or added weight
- Slow the retrieve, swing, or dead-drift streamers through productive water
Top Patterns
- BWO, size 18–20
- Rubber Legs / Zirdle, size 8–12
- TJ Hooker, size 8–12
- Frenchie, size 14–18
- Duracell, size 14–18
- Jig BWO, size 16–20
- Mini Dungeon
- Zonker / olive or black streamer
Clark Fork River
Conditions
The Clark Fork is around 1,720 CFS above Missoula on the latest verified reading and approximately 2,500 CFS below Missoula.
Trout are settling into winter water. Deep inside bends, foam lines, eddies, and slower seams are increasingly more important than fast summer riffles.
Where to Fish
- Deep inside bends
- Slow foam lines
- Eddies
- Soft tailouts
- Deeper side-channel seams
- Slow water adjacent to current
How to Fish It
- Do not expect meaningful dry-fly activity early
- Fish nymphs 4–6 feet deep through slower winter holding water
- Watch for BWO activity during the afternoon
- Use size 18–22 BWO cripples, emergers, and duns for selective fish
- Fish heavier nymph rigs through inside bends and foam lines
- Dead-drift, swing, or slowly crawl streamers through deeper water
- Olive and black streamer combinations remain excellent late-fall choices
Top Patterns
- BWO Film Critic / cripple, size 18–22
- Jig BWO, size 16–20
- Frenchie, size 14–18
- Pheasant Tail, size 16–20
- San Juan Worm
- Small stonefly nymph
- Thin Mint
- Mini Dungeon / olive-black streamer
Rock Creek
Conditions
Rock Creek near Clinton is around 292 CFS, down significantly from last week's rain-driven bump but still providing solid late-fall water.
The creek is settling and clearing. Expect trout to increasingly favor deeper riffle transitions, plunge pools, slow pockets, and tailouts as water temperatures continue to cool.
Where to Fish
- Deep riffle transitions
- Plunge pools
- Boulder pockets with softer current
- Inside seams
- Tailouts
- Slow foam lines
How to Fish It
- Wait until late morning before expecting consistent activity
- Fish Perdigons, Frenchies, Pheasant Tails, and stonefly nymphs through deeper runs
- Watch tailouts for BWOs during overcast afternoons
- Use small dries and fine tippet for selective risers
- Strip or swing smaller streamers through boulder runs and plunge pools
- Focus more on productive depth than covering large amounts of water
- Remember fishing from boats or vessels remains closed through November 30
Top Patterns
- BWO, size 18–22
- Griffith's Gnat, size 18–22
- Perdigon, size 16–20
- Frenchie, size 14–18
- Pheasant Tail, size 16–20
- Small dark stonefly
- Woolly Bugger / Thin Mint
- Small brown, olive, or black streamer
West Fork of the Bitterroot
Conditions
The latest verified West Fork reading near Conner is approximately 57.5 CFS. It remains extremely low despite last week's precipitation.
This is highly technical water. Fish will be concentrated into the deepest available pools, pockets, and slow runs. For most anglers, the mainstem Bitterroot is the better choice.
Where to Fish
- Deepest available pools
- Slow pockets around wood
- Protected tailouts
- Deep riffle edges
- Shaded water with adequate depth
How to Fish It
- Use long leaders and 5X–6X tippet
- Stay out of productive water whenever possible
- Fish small BWOs and midges
- Use Perdigons and Pheasant Tails through deeper pockets
- Make the first cast count
- Consider the mainstem Bitterroot unless technical small-water fishing is specifically what you want
Top Patterns
- BWO, size 18–22
- Griffith's Gnat, size 18–22
- Zebra Midge, size 18–22
- Perdigon, size 16–20
- Pheasant Tail, size 16–20
- Small olive or black streamer
Planning Note
Sunday: Rain likely with a high around 46. Excellent BWO and streamer weather. Start late and watch slower water through the afternoon.
Monday: Mostly sunny with a high around 50 after a cold morning. Nymph first, then watch for a short afternoon dry-fly window.
Tuesday: Partly sunny and warmer, near 55. Probably the easiest weather day of the week. Expect nymphing and streamer fishing to carry most of the day, with possible BWOs later.
Wednesday: Mostly sunny and near 53. Similar program: start late, fish deeper water, and watch for afternoon surface activity.
Thursday: Partly sunny with a chance of rain and a high near 51. Increasing clouds could improve BWO and streamer fishing.
Friday: Chance of rain with a high around 49. One of the better BWO and streamer setups after Sunday.
Saturday: Mostly sunny and around 51. Expect a shorter dry-fly window and more consistent nymphing through slow water.
Overall strategy: Sleep in. Fish nymphs and streamers through deeper winter water, then switch to small BWOs or midges when fish begin rising during the afternoon.
River Flow Snapshot – November 1, 2026
Where a November 1 observation was unavailable, the latest verified gauge value and date are shown rather than estimating a flow. All readings are provisional.
| River | Section | Gauge | Latest Verified Flow | Status |
|---|---|---|---|---|
| Bitterroot | Upper | Near Darby (12344000) | 240 CFS – Oct. 30 | Low / Settling |
| Bitterroot | Middle | Bell Crossing nr Victor (12350250) | 520 CFS – Oct. 30 | Falling / Latest Verified |
| Bitterroot | Lower | Near Missoula (12352500) | 916 CFS – Nov. 1 | Best Bitterroot Volume |
| Blackfoot | Lower | Near Bonner (12340000) | 655 CFS – Nov. 1 | Settling / Good Fall Flow |
| Clark Fork | Upper | Above Missoula (12340500) | 1,720 CFS – Oct. 30 | Solid Big-Water Option |
| Clark Fork | Lower | Below Missoula (12353000) | 2,500 CFS – Nov. 1 | Best Big-Water Volume |
| Rock Creek | Lower | Near Clinton (12334510) | 292 CFS – Nov. 1 | Falling / Wade Fishing Only |
| West Fork Bitterroot | Lower | Near Conner (12342500) | 57.5 CFS – Oct. 30 | Extremely Low / Technical |
The lower Bitterroot and Clark Fork continue to provide the most forgiving volume. The Blackfoot remains in a good late-fall range, Rock Creek has settled considerably from last week's bump, and the West Fork remains exceptionally low.
Fly Box of the Week
Dry Flies
- BWO, size 18–22
- Film Critic, size 18–22
- Last Chance Cripple, size 18–22
- Parachute Adams, size 18–20
- Griffith's Gnat, size 18–22
- Small October Caddis, size 10–12
Nymphs
- Frenchie, size 14–18
- Perdigon, size 16–20
- Pheasant Tail, size 16–20
- Duracell, size 14–18
- Jig BWO, size 16–20
- Zebra Midge, size 18–22
- Rubber Legs / Zirdle, size 8–12
Streamers
- Thin Mint
- Mini Dungeon
- Sculpzilla
- Sparkle Minnow
- Woolly Bugger
- Zonker
- Olive / black sculpin
Hatch and Fly Chart – Early November Edition
| Hatch / Insect | Activity | Best Time | Recommended Fly | Size |
|---|---|---|---|---|
| BWOs | Primary surface hatch | Early afternoon–4:00 p.m. | Cripple, emerger, dun, nymph | 18–22 |
| Midges | Increasingly important as water cools | Late morning–afternoon | Griffith's Gnat, Zebra Midge, larva / pupa | 18–24 |
| Mahogany Duns | Fading rapidly | Midday | Mahogany dry or emerger | 14–16 |
| October Caddis | Late-season leftovers | Warm afternoons | Adult or pupa | 10–12 |
| Stonefly Nymphs | Consistent subsurface food | All day | Rubber Legs, Zirdle, TJ Hooker | 8–12 |
BWOs and midges now deserve the majority of the dry-fly space in the box. Mahoganies and October Caddis are becoming bonus bugs rather than something to plan the day around.
Gear Picks of the Week
Warm Layers
Morning temperatures are dropping below freezing. The productive afternoon window is much easier to enjoy if you are not already cold before it starts.
5X–6X Tippet
Small BWOs and midges combined with clear water make fine tippet increasingly important for rising fish.
Streamer Setup
Streamer fishing is one of the most dependable late-fall options right now. Keep a dedicated rod rigged rather than rebuilding the dry-fly rod whenever clouds arrive.
Strategy and Expectations This Week
The middle and lower Bitterroot remain the best overall local recommendation. Fish slower water than you did a month ago and expect the best action after late morning.
The Blackfoot is our best streamer recommendation. Focus on deeper winter water, with nymphing filling the gaps between streamer opportunities.
The Clark Fork is the best river for dedicated afternoon BWO fishing. Do not spend the morning forcing dries. Wait for fish to show themselves.
Rock Creek remains an excellent wade option. Fish deeper pockets and slower water, and expect shorter BWO windows rather than all-afternoon surface feeding.
The West Fork remains extremely low. Recommend the mainstem Bitterroot to most anglers unless they specifically want highly technical small-water fishing.
