Western Montana Fly Fishing Report
Current Hoot-Owl and Closure Summary
Hoot-owl restrictions prohibit fishing from 2:00 p.m. to midnight. The current FWP restriction list reviewed for this report shows the following active restrictions and closures affecting our main area:
- Bitterroot River: Hoot-owl restrictions from Veteran’s Bridge in Hamilton downstream to the confluence with the Clark Fork River.
- Clark Fork River: Hoot-owl restrictions from the river’s origin at Warm Springs Creek and Silver Bow Creek downstream to the confluence with the Blackfoot River.
- 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.
The current visible FWP list reviewed today does not show active hoot-owl restrictions for the East Fork Bitterroot, West Fork Bitterroot, Blackfoot River, Upper Rock Creek, or Upper Lolo Creek. That said, late-summer restrictions can change quickly. Check Montana FWP 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-summer condition. Flows are low to moderate for August, clarity is 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 forecast is friendlier than last week, with highs mostly in the 80s, a warmer push around Wednesday and Thursday, and afternoon thunderstorm chances early in the week. Cloud cover and showers may extend surface activity at times, but this is still a morning-focused report. Fish early, carry a thermometer, shorten fights, and quit when water temperatures climb.
Bitterroot River
Conditions
The Bitterroot is low, clear, and technical, with improved flow on the upper river compared to last week. Latest available readings show about 495 CFS near Darby, 386 CFS at Bell Crossing, and 744 CFS near Missoula. Current FWP listings show hoot-owl restrictions from Veteran’s Bridge in Hamilton downstream to the Clark Fork. Above Hamilton, anglers still need to watch temperatures and fish with restraint, especially on bright 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 for ants, beetles, and hoppers
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, and hoppers 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
- Stop before water temperatures become stressful, especially downstream of Hamilton
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 or black streamer, size 6–8
Blackfoot River
Conditions
The Blackfoot near Bonner is around 757 CFS with a cool early-morning water temperature reading. Current FWP listings do not show a Blackfoot hoot-owl restriction, but the river remains closed to floating from Weigh Station Fishing Access Site downstream to I-90. Fishing can be productive 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 current closures before launching or planning a 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 1,250 CFS above Missoula and around 2,060 CFS below Missoula. Current FWP listings show hoot-owl restrictions from the river’s origin to the confluence with the Blackfoot River. That means the upper Clark Fork should be treated as a morning-only fishery. Missoula-area water below the Blackfoot is not listed in the current hoot-owl reach reviewed for this report, but water temperatures still need attention.
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 331 CFS with a cool early-morning water temperature reading. The creek is clear, technical, and still one of the better wade-fishing options in the region. Current FWP listings reviewed for this report do not show an active Upper Rock Creek hoot-owl restriction, but anglers should still fish early, move carefully, and watch afternoon temperatures.
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 309 CFS. Current FWP listings reviewed for this report do not show an active West Fork hoot-owl restriction, which is a meaningful change from last week’s broader restriction picture. The West Fork remains a strong smaller-water option if anglers fish early, make careful presentations, and check temperatures through the day.
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 still a morning-first week, but it is less punishing than last week. Plan around the 6:30 a.m. to 11:00 a.m. window. Cloud cover, haze, showers, and afternoon thunderstorm chances may create brief opportunities, but warm-water stress is still the main concern on lower, slower water.
Wednesday and Thursday are the warmest days in the forecast. Saturday looks cooler and cloudier with a shower chance, which may help surface fishing if water temperatures cooperate. Carry a stream thermometer, keep fish wet, shorten fights, and check current FWP restrictions before every trip.
River Flow Snapshot – August 16, 2026
Values are based on latest available USGS readings reviewed August 16. Some gauges had latest readings from August 14–15. USGS readings are provisional and may change during the day.
| River | Section | Gauge | Flow (CFS) | Trend / Status |
|---|---|---|---|---|
| Bitterroot | Upper | Near Darby (12344000) | 495 | Improved / Still Technical |
| Bitterroot | Middle | Bell Crossing nr Victor (12350250) | 386 | Low / Technical |
| Bitterroot | Lower | Near Missoula (12352500) | 744 | Low / Hoot Owl Below Veteran’s Bridge |
| Blackfoot | Lower | Near Bonner (12340000) | 757 | Low / Float Closure Below Weigh Station |
| Clark Fork | Upper | Above Missoula (12340500) | 1,250 | Low / Hoot Owl Above Blackfoot |
| Clark Fork | Lower | Below Missoula (12353000) | 2,060 | Low / Morning Best |
| Rock Creek | Lower | Near Clinton (12334510) | 331 | Clear / Technical Wade Fishing |
| West Fork Bitterroot | Lower | Near Conner (12342500) | 309 | Managed / Good Smaller-Water Option |
Flows are still low and technical, but several rivers have a little more water than last week. That helps the morning program, but it does not replace temperature awareness or careful handling.
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 – Mid-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 spinner falls 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 daily players | Morning through midday | Ant, beetle, hopper, or small attractor | 10–18 |
| Spruce Moths | Available in timbered sections where moths are present | Morning through midday | Spruce moth dry | 12–16 |
| Hecubas | Worth watching later in the month, especially with cooler weather | Late morning to afternoon where temperatures allow | Large rusty mayfly or Hecuba-style dry | 10–12 |
Tricos, terrestrials, caddis, late PMDs, nocturnal stones, and spruce moths are the key bugs this week. Cooler and cloudier periods may help surface activity, but the best dry-fly fishing should still happen early.
Gear Picks of the Week
Stream Thermometer
This is still required summer gear. Check water temperatures often, especially on the Bitterroot below Hamilton, the Clark Fork, and slower lower-river sections.
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, and timbered banks.
Strategy and Expectations This Week
This should fish better than the worst heat of early August, but it is still not a full-day summer free-for-all. Expect the best action early with Tricos, PMD spinners, caddis pupa, terrestrials, nocturnal stones, spruce moths, and small dry-dropper rigs. Cloud cover and showers may improve streamer fishing and extend surface activity if water temperatures cooperate.
The Bitterroot above Hamilton, Rock Creek, and the West Fork are the best local bets for careful morning fishing. The Bitterroot below Veteran’s Bridge and the upper Clark Fork have active hoot-owl restrictions. The Blackfoot is fishable early, but the Weigh Station to I-90 float closure remains the major planning issue.
