Western Montana Fly Fishing Report
Current Restrictions and Closure Summary
Current FWP listings reviewed for this report do not show active local hoot-owl restrictions on the Bitterroot, Clark Fork, Blackfoot, Rock Creek, West Fork, East Fork, or Upper Lolo. Recent notices show those restrictions were lifted as water temperatures improved.
- Blackfoot River: Closed to floating from Weigh Station Fishing Access Site downstream to the point where the river crosses under Interstate 90 because of bridge construction.
- Hoot-owl definition: Where active, hoot-owl restrictions prohibit fishing from 2:00 p.m. to midnight.
- Daily reminder: FWP restrictions can change quickly in late summer. Check the current FWP page before every trip, launch, or customer recommendation.
Regional River Conditions Overview
The Bitterroot, Blackfoot, Clark Fork, Rock Creek, and West Fork are all in late-August condition. Flows are low, visibility is generally good, and trout are concentrated around oxygenated water: riffle edges, shaded banks, faster broken water, foam lines, deeper slots, pocket water, and cold-water influence.
The weather is more moderate than early August, with highs mostly in the low-to-upper 80s and a cooler, cloudier finish to the week. Tuesday and Wednesday bring afternoon thunderstorm chances, which may help surface activity or streamer fishing if cloud cover develops. Even without current local hoot-owl restrictions, this is still a morning-first fishing week.
Bitterroot River
Conditions
The Bitterroot is low, clear, and technical, but several sections have a little more shape than the thinnest part of August. Latest available readings show about 490 CFS near Darby, 329 CFS at Bell Crossing, and 705 CFS near Missoula. Current FWP listings reviewed for this report do not show an active Bitterroot hoot-owl restriction, but the lower river should still be treated carefully during warm afternoons.
Where to Fish
- Upper and middle-river riffle edges
- Foam lines along inside bends
- Cold-water influence and shaded banks
- Tailouts during Trico and PMD spinner activity
- Deeper slots beside faster current
- Grassy banks, undercuts, and shaded structure for hoppers, ants, and beetles
How to Fish It
- Start with Trico spinners, PMD spinners, and small mayfly cripples in soft morning water
- Use longer leaders and 5X–6X tippet where fish are feeding in clear, flat water
- Fish small dry-dropper rigs through riffle edges when fish are not visibly rising
- Use ants, beetles, hoppers, and small foam attractors tight to grassy banks as the morning warms
- Try nocturnal stone or small foam attractor dries at first light along structure
- Swing caddis soft hackles or fish caddis pupa through riffle seams
- Keep a stream thermometer handy and stop if water temperatures climb
Top Patterns
- Trico spinner, size 18–22
- PMD spinner, emerger, or cripple, size 16–18
- Caddis dry, pupa, or soft hackle, size 14–18
- Nocturnal stone dry or nymph, size 6–10
- Ant or beetle, size 12–18
- Hopper or small foam terrestrial, size 8–14
- Small olive, tan, or black streamer, size 6–8
Blackfoot River
Conditions
The Blackfoot near Bonner is around 648 CFS with an early-morning water temperature reading around 18.0°C. Current FWP listings reviewed for this report do not show a Blackfoot hoot-owl restriction, but the Weigh Station to I-90 floating closure remains active. Fish early around boulder water, faster banks, timbered sections, shaded pockets, and oxygenated riffles.
Where to Fish
- Morning boulder edges and shaded banks
- Fast riffle edges with oxygen
- Foam lines below structure
- Cold-water influence and deeper buckets
- Timbered banks where spruce moths may show
- Inside seams below heavier current
How to Fish It
- Fish early with attractor dries, hoppers, ants, beetles, and spruce moths
- Run a PMD, caddis, or small jig dropper below a buoyant dry
- Use caddis pupa and soft hackles through riffles and buckets
- Watch timbered areas for spruce moth activity
- Streamer fish shaded buckets at first light or during stormy cloud cover
- Avoid slow, warm water if the day heats up
- Check the floating closure before planning a Blackfoot float
Top Patterns
- Spruce moth, size 12–16
- Hopper, size 8–12
- Ant or beetle, size 12–18
- PMD dry or emerger, size 16–18
- Caddis dry or pupa, size 14–18
- Small Perdigon or jig nymph, size 14–18
- Olive, black, or tan streamer, size 4–8
Clark Fork River
Conditions
The Clark Fork is around 1,236 CFS above Missoula on latest available NWRFC data and around 1,850 CFS below Missoula. Current FWP listings reviewed for this report do not show a local Clark Fork hoot-owl restriction, but the river remains low and temperature-sensitive. Morning is still the best program, especially around riffles, foam lines, shade, depth, and side-channel current.
Where to Fish
- Morning riffle edges and foam lines
- Soft seams beside faster water
- Drop-offs below shallow shelves
- Grassy banks with overhead cover
- Shaded buckets and oxygenated current
- Side channels with depth and flow
How to Fish It
- Start early with Tricos, PMDs, and small caddis in soft feeding lanes
- Use terrestrial dries near grass, shade, and undercut banks
- Fish small dry-dropper rigs through riffles before the sun gets high
- Try nocturnal stone patterns at first light along structure
- Nymph oxygenated riffle edges when fish are not looking up
- Streamer fish during clouds, showers, or thunderstorm-influenced light
- Watch water temperatures closely, especially on lower, slower water
Top Patterns
- Trico spinner, size 18–22
- PMD spinner, emerger, or dry, size 16–18
- Caddis dry or pupa, size 14–18
- Nocturnal stone dry or nymph, size 6–10
- Ant, beetle, or hopper, size 10–18
- Perdigon or small jig nymph, size 14–18
- Olive, tan, or black streamer
Rock Creek
Conditions
Rock Creek near Clinton is around 276 CFS and remains clear, low, and technical. Current FWP listings reviewed for this report do not show an active Upper Rock Creek hoot-owl restriction. Rock Creek remains one of the better wade-fishing options, but the lower flows mean stealth, careful wading, and clean first casts matter.
Where to Fish
- Riffle edges and oxygenated pocket water
- Shaded willow edges and cutbanks
- Boulder cushions and soft pockets
- Tailouts during PMD and Trico activity
- Foam lines below faster runs
- Timbered sections where spruce moths may be active
How to Fish It
- Start with PMD or Trico spinners in soft seams and tailouts
- Use small attractor dry-dropper rigs through pocket water
- Fish caddis and small mayfly droppers through riffle edges
- Use ants, beetles, and hoppers near banks and overhanging vegetation
- Carry spruce moths for timbered stretches
- Streamer fish shaded buckets early or during stormy periods
- Wade carefully and avoid blowing up skinny holding water
Top Patterns
- PMD spinner or emerger, size 16–18
- Trico spinner, size 18–22
- Caddis dry or pupa, size 14–18
- Small foam attractor, size 12–16
- Ant, beetle, or hopper, size 10–18
- Spruce moth, size 12–16
- Olive or black streamer, size 4–8
West Fork of the Bitterroot
Conditions
The latest available West Fork near Conner reading is around 305 CFS. Current FWP listings reviewed for this report do not show an active West Fork hoot-owl restriction. The West Fork remains a strong smaller-water option this week, especially for anglers looking for cleaner water, technical dry-fly fishing, and more comfortable morning temperatures.
Where to Fish
- Shaded riffle edges below Painted Rocks
- Protected tailouts and inside seams
- Foam lines beside structure
- Deeper pockets below wood and boulders
- Soft glides during PMD, Trico, and caddis activity
- Overhanging banks for ants, beetles, and hoppers
How to Fish It
- Use longer leaders and 5X–6X tippet when fish are spooky
- Start with PMD, Trico, caddis, or small terrestrial dries in soft water
- Use small dry-dropper rigs through riffles and pockets
- Fish ants, beetles, and hoppers near banks and overhanging grass
- Make careful first casts before stepping into productive water
- Stop fishing if water temperatures climb or fish become stressed
Top Patterns
- PMD dry or emerger, size 16–18
- Trico spinner, size 18–22
- Caddis dry or pupa, size 14–18
- Small foam attractor, size 12–16
- Ant or beetle, size 12–18
- Small hopper, size 10–14
- Small olive streamer
Planning Note
This is a good late-August morning fishing week, not a long-day summer grind. Plan around the 6:30 a.m. to 11:30 a.m. window. Tuesday and Wednesday thunderstorm chances may create brief cloud-cover windows, and Saturday’s cooler, cloudier forecast could help surface activity if water temperatures cooperate.
Even without current local hoot-owl restrictions, warm-water stress is still possible on lower, slower water. Carry a stream thermometer, keep fish wet, shorten fights, and stop fishing when water temperatures climb. The best local bets are the Bitterroot above the warmest lower reaches, Rock Creek, and the West Fork, with the Blackfoot still requiring float-closure awareness.
River Flow Snapshot – August 23, 2026
Values are based on latest available USGS and NWRFC readings reviewed August 23. Several gauges had latest readings from August 19–22. USGS readings are provisional and may change during the day.
| River | Section | Gauge | Flow (CFS) | Trend / Status |
|---|---|---|---|---|
| Bitterroot | Upper | Near Darby (12344000) | 490 | Low / Fishable Morning Window |
| Bitterroot | Middle | Bell Crossing nr Victor (12350250) | 329 | Low / Technical |
| Bitterroot | Lower | Near Missoula (12352500) | 705 | Low / Watch Temps |
| Blackfoot | Lower | Near Bonner (12340000) | 648 | Low / Float Closure Below Weigh Station |
| Clark Fork | Upper | Above Missoula (12340500) | 1,236 | Low / Morning Best |
| Clark Fork | Lower | Below Missoula (12353000) | 1,850 | Low / Watch Temps |
| Rock Creek | Lower | Near Clinton (12334510) | 276 | Clear / Technical Wade Fishing |
| West Fork Bitterroot | Lower | Near Conner (12342500) | 305 | Managed / Good Smaller-Water Option |
Flows are still low and technical, but the cooler forecast and lifted local hoot-owl restrictions make this a better fishing week than early August. Morning timing and careful handling still matter more than trying to force a full-day program.
Fly Box of the Week
Dry Flies
- Trico spinner, size 18–22
- PMD spinner, emerger, or cripple, size 16–18
- Caddis dry, size 14–18
- Nocturnal stone dry, size 6–10
- Ant, beetle, or hopper, size 10–18
- Spruce moth, size 12–16
- Small foam attractor, size 10–16
Nymphs
- PMD nymph, size 16–18
- Trico or small mayfly nymph, size 18–22
- Caddis pupa, size 14–18
- Small Perdigon, size 14–18
- Frenchie, size 14–18
- Small jig attractor, size 14–18
Streamers
- Olive streamer, size 4–8
- Black streamer, size 4–8
- Tan or natural sculpin, size 4–8
- Small white streamer, size 6–8
Hatch and Fly Chart – Late August Edition
| Hatch / Insect | Activity | Best Time | Recommended Fly | Size |
|---|---|---|---|---|
| Tricos | Important on calmer morning water | Early morning | Spinner or small mayfly pattern | 18–22 |
| PMDs | Late-stage spinners and emergers remain useful | Early morning to late morning | Spinner, emerger, cripple, dun, or nymph | 16–18 |
| Caddis | Morning pupa and evening dries where temperatures allow | Morning and evening | Dry, pupa, larva, or soft hackle | 14–18 |
| Nocturnal Stones | Useful early along structure and lower-river banks | First light | Dark stone dry or stonefly nymph | 6–10 |
| Terrestrials | Hoppers, ants, and beetles are the main surface food | Morning through midday | Ant, beetle, hopper, or small attractor | 10–18 |
| Spruce Moths | Still worth carrying in timbered sections | Morning through midday | Spruce moth dry | 12–16 |
| Hecubas | Worth watching as late August cools, especially on cloudy days | Late morning to afternoon where temperatures allow | Large rusty mayfly or Hecuba-style dry | 10–12 |
| BWOs | Possible during cooler, cloudier, storm-influenced windows | Late morning to afternoon during clouds | BWO dry, emerger, or nymph | 18–22 |
Tricos, terrestrials, caddis, late PMDs, nocturnal stones, and spruce moths are the key bugs this week. Cooler and cloudier periods may bring some early fall behavior into play, especially BWOs or larger rusty mayfly-style patterns where conditions line up.
Gear Picks of the Week
Stream Thermometer
This still belongs in every pack. Hoot-owl restrictions may be lifted locally, but water temperatures still decide whether fishing should continue.
Fine Tippet and Longer Leaders
Low, clear water means better presentations matter. Carry 4X, 5X, and 6X for Tricos, PMDs, caddis, and smaller terrestrials.
Terrestrial and Spruce Moth Box
Hoppers, ants, beetles, and spruce moths should be ready this week, especially around grass, shade, undercuts, and timbered banks.
Strategy and Expectations This Week
This should be a better fishing week than early August. Cooler nights, highs mostly in the 80s, and lifted local hoot-owl restrictions help, but the rivers are still low and technical. Expect the best action early with Tricos, PMD spinners, caddis pupa, terrestrials, nocturnal stones, spruce moths, and small dry-dropper rigs.
The Bitterroot, Rock Creek, and West Fork are the best local bets for careful morning fishing. The Blackfoot can fish well early, but the Weigh Station to I-90 floating closure remains the major planning issue. The Clark Fork is low and can be productive in the right morning water, especially with cloud cover, but temperatures still need attention.
