Western Montana Fly Fishing Report
Current Hoot-Owl and Closure Summary
Hoot-owl restrictions prohibit fishing from 2:00 p.m. to midnight. The restrictions below were active when this report was updated.
- Bitterroot River: Entire mainstem, from the confluence of the East and West forks to the Clark Fork River.
- East Fork Bitterroot River: From Star Falls to the confluence with the West Fork.
- West Fork Bitterroot River: From Painted Rock Dam to the confluence with the East Fork Bitterroot River.
- Blackfoot River: From Cedar Meadow Fishing Access Site to the confluence with the Clark Fork River.
- Clark Fork River: From the river’s origin at Warm Springs Creek and Silver Bow Creek to the confluence with the Flathead River.
- Upper Rock Creek: From the confluence of the West and Middle forks to the mouth of Stoney Creek.
- Upper Lolo Creek: From the headwaters to the confluence with South Fork Lolo Creek.
- Clark Fork cold-water refuges: Fishing closures are in effect within a 100-yard radius of the mouths of Fish Creek, Rattlesnake Creek, and the St. Regis River where they meet the Clark Fork.
- Blackfoot floating closure: Weigh Station Fishing Access Site downstream to the I-90 crossing because of bridge construction.
Restrictions and closures can change quickly during hot weather. Check Montana FWP before fishing, launching, or recommending a section to customers.
Regional River Conditions Overview
The Bitterroot, Blackfoot, Clark Fork, Rock Creek, West Fork, and East Fork are all in late-summer condition. Flows are low, clarity is good, and trout are concentrated in oxygenated water: riffle edges, shaded banks, faster broken water, foam lines, deeper slots, pocket water, and cold-water influence.
Sunday through Wednesday bring hazy sunshine, smoke, and highs in the mid-to-upper 80s or around 90 degrees. Thursday through Saturday look slightly cooler, with some clouds, shower chances, and possible thunderstorms. That late-week change may help fishing briefly if clouds hold, but this is still an early-morning program. Plan on first light, shorten the day, and stop when water temperatures climb.
Bitterroot River
Conditions
The Bitterroot mainstem is low, clear, technical, and under hoot-owl restrictions from the confluence of the East and West forks downstream to the Clark Fork. Current readings show about 454 CFS near Darby, 203 CFS at Bell Crossing, and the latest available lower-river reading near Missoula around 641 CFS. The East Fork and West Fork also have active hoot-owl restrictions on listed reaches. Morning fishing can still be productive, but anglers need to treat the whole drainage as temperature-sensitive.
Where to Fish
- Upper-river riffle edges and faster broken water
- Cold-water influence and shaded banks
- Foam lines along inside bends
- Tailouts during Trico and PMD spinner activity
- Deeper slots beside faster current
- Grassy banks for ants, beetles, and small hoppers
How to Fish It
- Start at first light with Tricos, PMD spinners, and small mayfly cripples
- Use longer leaders and 5X–6X tippet in clear, low water
- Fish small dry-droppers through riffle edges when fish are not visibly rising
- Use ants, beetles, and small hoppers tight to grassy banks once light hits the water
- Try nocturnal stone or small attractor dries early along structure
- Fish caddis pupa and soft hackles through riffle seams
- Stop well before afternoon water temperatures become stressful
Top Patterns
- Trico spinner, size 18–22
- PMD spinner, emerger, or cripple, size 16–18
- Caddis dry or pupa, size 14–18
- Yellow Sally dry or nymph, size 14–16
- Nocturnal stone dry or nymph, size 6–10
- Ant, beetle, or small hopper, size 10–18
- Small olive or black streamer, size 6–8
Blackfoot River
Conditions
The Blackfoot near Bonner is around 757 CFS and remains under hoot-owl restrictions from Cedar Meadow Fishing Access Site to the confluence with the Clark Fork River. A floating closure is also listed from Weigh Station Fishing Access Site downstream to the I-90 crossing. The river can fish early, especially in boulder water, faster banks, timbered sections, shaded pockets, and oxygenated riffles, but warm afternoons are off the table.
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, small 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
- Avoid slow, warm water and end the day early
- Check current closures before launching or planning a float
Top Patterns
- Spruce moth, size 12–16
- Small 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 1,260 CFS above Missoula and around 1,860 CFS below Missoula. Hoot-owl restrictions are in effect from the river’s origin to the confluence with the Flathead River, which includes the Missoula-area sections. Fishing closures are also in effect within a 100-yard radius around the mouths of Fish Creek, Rattlesnake Creek, and the St. Regis River where they enter the Clark Fork. Treat the Clark Fork as an early-morning, temperature-conscious fishery only.
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 early or during smoke, clouds, or shower activity
- Avoid listed cold-water refuge closures and end the day early
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 286 CFS and remains clear, low, and technical. Upper Rock Creek is under hoot-owl restrictions from the confluence of the West and Middle forks to the mouth of Stoney Creek. Lower and middle Rock Creek remain useful early wade options, but the creek is skinny enough that stealth, careful wading, and clean presentations matter.
Where to Fish
- Lower and middle creek 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 small hoppers near banks and overhanging vegetation
- Carry spruce moths for timbered stretches
- Streamer fish shaded buckets early or during smoke-heavy periods
- Know whether you are inside the Upper Rock Creek hoot-owl reach before fishing past midday
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 small 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 255 CFS. The West Fork is under hoot-owl restrictions from Painted Rock Dam to the confluence with the East Fork. It remains one of the better smaller-water options in the Bitterroot system only if anglers fish early, check temperatures, and respect the 2:00 p.m. to midnight closure.
Where to Fish
- Shaded riffle edges below Painted Rock Dam
- 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 small 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 small 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
- Respect the active hoot-owl restriction from Painted Rock Dam to the East Fork
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
East Fork of the Bitterroot
Conditions
The East Fork Bitterroot is under hoot-owl restrictions from Star Falls to the confluence with the West Fork. Treat it as an early-morning-only option. This water is low, clear, and cutthroat-sensitive in places, so careful presentations and careful fish handling are not optional.
Where to Fish
- Shaded riffle edges and faster pocket water
- Cold-water influence and shaded banks
- Small tailouts during morning mayfly activity
- Foam lines and broken water with depth
- Overhanging grass and brush for terrestrials
How to Fish It
- Fish early and stop before the day warms
- Use small dries, terrestrials, and light dry-dropper rigs
- Keep casts clean and presentations soft in low, clear water
- Use 5X–6X tippet when fish are selective
- Keep fish wet and avoid prolonged handling
Top Patterns
- Small PMD dry or emerger, size 16–18
- Trico spinner, size 18–22
- Caddis dry, size 14–18
- Ant or beetle, size 12–18
- Small hopper, size 10–14
- Small Perdigon or jig nymph, size 16–18
Upper Lolo Creek
Conditions
Upper Lolo Creek is under hoot-owl restrictions from the headwaters to the confluence with South Fork Lolo Creek. This is a cutthroat-focused system where warm-water stress matters quickly. Treat it as a first-light-only option, and do not use it as a loophole around bigger-river restrictions.
Where to Fish
- Shaded pocket water
- Cold-water influence and small riffles
- Brushy banks with terrestrials
- Deeper pools below fast water
- Soft seams with overhead cover
How to Fish It
- Use small dries and light dry-dropper rigs
- Fish early and keep sessions short
- Use stealth, short drifts, and soft casts
- Keep fish wet and avoid unnecessary handling
- Stop when temperatures rise or fish show stress
Top Patterns
- Small caddis dry, size 14–18
- Ant or beetle, size 12–18
- Small hopper, size 10–14
- PMD emerger, size 16–18
- Small jig nymph, size 16–18
Planning Note
This remains an early-only fishing week. The best window is 6:00 a.m. to 10:00 a.m., especially on the Bitterroot, Blackfoot, Clark Fork, West Fork, East Fork, Upper Rock Creek, and Upper Lolo Creek. Hazy smoke may extend low-light conditions slightly, but it does not cancel warm-water stress.
Thursday through Saturday may bring clouds, showers, and slightly cooler temperatures. That could improve streamer fishing and extend morning surface activity if water temperatures cooperate. Still, carry a stream thermometer, keep fish wet, shorten fights, and stop fishing when temperatures become stressful.
River Flow Snapshot – August 9, 2026
Values are based on the latest available readings reviewed August 9. USGS readings are provisional and may change during the day. Some gauges had latest available readings from August 6–8.
| River | Section | Gauge | Flow (CFS) | Trend / Status |
|---|---|---|---|---|
| Bitterroot | Upper | Near Darby (12344000) | 454 | Low / Hoot Owl Mainstem |
| Bitterroot | Middle | Bell Crossing nr Victor (12350250) | 203 | Very Low / Technical |
| Bitterroot | Lower | Near Missoula (12352500) | 641 | Low / Warm / Hoot Owl |
| Blackfoot | Lower | Near Bonner (12340000) | 757 | Low / Hoot Owl Below Cedar Meadow |
| Clark Fork | Upper | Above Missoula (12340500) | 1,260 | Low / Hoot Owl |
| Clark Fork | Lower | Below Missoula (12353000) | 1,860 | Low / Hoot Owl / Cold-Water Refuge Closures |
| Rock Creek | Lower | Near Clinton (12334510) | 286 | Clear / Technical / Upper Hoot Owl |
| West Fork Bitterroot | Lower | Near Conner (12342500) | 255 | Managed / Hoot Owl Below Painted Rock Dam |
Flows are low and technical across the region. Fishing can still be productive, but timing, water temperature, careful fish handling, and choosing oxygenated water matter more than fly selection alone.
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 small hopper, size 10–18
- Spruce moth, size 12–16
- Small foam attractor, size 12–16
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 – Early 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 limited 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 | Ants, beetles, and small hoppers 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 |
Tricos, PMDs, caddis, terrestrials, nocturnal stones, and spruce moths are the key insects this week. The best surface fishing should happen early, before bright sun and warming water shut down the better feeding windows.
Gear Picks of the Week
Stream Thermometer
This is required summer gear right now. Check water temperatures often, especially on the Bitterroot system, Blackfoot, Clark Fork, Rock Creek, and West Fork.
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
Ants, beetles, small hoppers, and spruce moths should be ready this week, especially around grass, shade, and timbered banks.
Strategy and Expectations This Week
This is a productive but highly temperature-sensitive fishing week. The best action should happen early, with Tricos, PMD spinners, caddis pupa, terrestrials, nocturnal stones, spruce moths, and small dry-dropper rigs doing most of the work. Smoke and haze may soften the light, but they do not remove the need to watch water temperatures.
The Bitterroot mainstem, East Fork, West Fork, Blackfoot, Clark Fork, Upper Rock Creek, and Upper Lolo Creek all have active hoot-owl restrictions on listed reaches. This is not a week for long fishing days. It is a week for early starts, careful fish handling, and knowing the exact reach you are fishing before you go.
