Western Montana Fly Fishing Report
Regional River Conditions Overview
The Bitterroot, Blackfoot, Clark Fork, Rock Creek, and West Fork are all in true summer condition. Flows are lower, clarity is good, and trout are concentrating in oxygenated water: riffle edges, shaded banks, foam lines, deeper slots, pocket water, and cold-water influence. Dry-fly fishing can be good at first light through late morning, but the window tightens quickly once sun and water temperatures climb.
The main strategy this week is to start early, fish clean, handle trout carefully, and be done before the water gets stressful. Tricos and PMD spinners are increasingly important on calmer water. Caddis, Yellow Sallies, terrestrials, and nocturnal stones are useful searching options. Spruce moths are starting to matter in timbered sections, especially on Rock Creek and parts of the Blackfoot.
Bitterroot River
Conditions
The Bitterroot is low, clear, technical, and under hoot-owl restrictions on the entire mainstem. Flows are roughly 400–430 CFS near Darby, 313–350 CFS at Bell Crossing, and around 895 CFS near Missoula. Morning water can fish well, but afternoon temperatures have already triggered restrictions. The best plan is to fish early, focus higher in the system when possible, and avoid lower-river heat.
Where to Fish
- Upper and middle-river riffle edges
- Cold-water influence and faster broken water
- Foam lines along inside bends
- Shaded banks and undercut grassy edges
- Tailouts during Trico and PMD spinner activity
- Deeper slots beside faster current
How to Fish It
- Start at first light with Tricos, PMD spinners, and small mayfly cripples
- Use longer leaders and lighter 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 the sun 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 12–16
- 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 1,020 CFS and in low summer shape. The river can fish well early, especially around riffles, boulders, shade, and faster banks, but hot afternoons are not the time to push it. A floating closure remains listed from Weigh Station Fishing Access Site downstream to the I-90 crossing.
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, Yellow Sally, 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 do not extend the day into the afternoon heat
- Check the current floating closure before launching
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
- Yellow Sally dry or nymph, size 12–16
- Caddis dry or pupa, size 14–18
- Olive, black, or tan streamer, size 4–8
Clark Fork River
Conditions
The Clark Fork is around 1,960 CFS above Missoula and around 2,950 CFS below Missoula. The river is low enough to concentrate fish in defined holding water, but warm afternoon temperatures are a concern. The local Missoula-area reaches can fish in the morning, especially where riffles, foam lines, shade, and depth line up.
Where to Fish
- Morning riffle edges and foam lines
- Soft seams beside faster water
- Drop-offs below shallow shelves
- Grassy banks with overhead cover
- Cold-water influence and shaded buckets
- Side channels with depth and oxygen
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 and cloud cover
- Watch water temperatures closely and avoid afternoon stress periods
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 462–475 CFS and remains one of the better wade-fishing options in the region. It is clear and technical, but it offers oxygenated pocket water, shaded banks, and timbered sections that may see early spruce moth activity. Morning is still the best and most responsible window.
Where to Fish
- Riffle edges and 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 Yellow Sallies and caddis 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
- Wade carefully and avoid overplaying fish in warm water
Top Patterns
- PMD spinner or emerger, size 16–18
- Trico spinner, size 18–22
- Yellow Sally dry or nymph, size 12–16
- Caddis dry or pupa, size 14–18
- 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 West Fork near Conner is around 140–150 CFS. It is clear, low, and technical. This remains the best smaller-water option in the Bitterroot system, especially for anglers who want cooler morning water and careful dry-fly fishing. Fish are spooky in the lower flows, so approach and presentation matter.
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 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 Yellow Sally 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
Top Patterns
- PMD dry or emerger, size 16–18
- Trico spinner, size 18–22
- Yellow Sally dry or nymph, size 12–16
- Caddis dry or pupa, size 14–18
- Small foam attractor, size 12–16
- Ant or beetle, size 12–18
- Small olive streamer
Planning Note
This is an early-only fishing week across much of Western Montana. Plan around the 6:00 a.m. to 10:30 a.m. window, especially on the Bitterroot, lower Clark Fork, and Blackfoot. The Bitterroot mainstem is under hoot-owl restrictions, but ethical fishing should end earlier than the legal cutoff when water temperatures rise.
Saturday is forecast to be the hottest day of the week. Treat it as a sunrise-only day unless you are fishing colder upper water and checking temperatures carefully. Carry a stream thermometer, keep fish wet, shorten fights, and stop fishing when water temperatures become stressful.
River Flow Snapshot – July 26, 2026
Values are based on the latest available readings reviewed July 26. USGS readings are provisional and may change during the day.
| River | Section | Gauge | Flow (CFS) | Trend / Status |
|---|---|---|---|---|
| Bitterroot | Upper | Near Darby (12344000) | 400–430 | Low / Hoot Owl Mainstem |
| Bitterroot | Middle | Bell Crossing nr Victor (12350250) | 313–350 | Low / Technical |
| Bitterroot | Lower | Near Missoula (12352500) | 895 | Warm / Morning Only |
| Blackfoot | Lower | Near Bonner (12340000) | 1,020 | Low Summer / Closure Below Weigh Station |
| Clark Fork | Upper | Above Missoula (12340500) | 1,960 | Summer Flow / Morning Best |
| Clark Fork | Lower | Below Missoula (12353000) | 2,950 | Warm / Fish Early |
| Rock Creek | Lower | Near Clinton (12334510) | 462–475 | Clear / Wade Fishing |
| West Fork Bitterroot | Lower | Near Conner (12342500) | 140–150 | Low / Technical |
Flows are now low and technical across the region. Fishing can still be good, but timing, water temperature, and careful fish handling matter more than forcing a long day.
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
- Yellow Sally dry, size 12–16
- Nocturnal stone dry, size 6–10
- Ant, beetle, or small hopper, size 10–18
- Spruce moth, size 12–16
Nymphs
- PMD nymph, size 16–18
- Trico or small mayfly nymph, size 18–22
- Yellow Sally nymph, size 12–16
- Caddis pupa, size 14–18
- Stonefly nymph, size 6–10
- Perdigon or 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 July Edition
| Hatch / Insect | Activity | Best Time | Recommended Fly | Size |
|---|---|---|---|---|
| Tricos | Increasingly important on calmer morning water | Early morning | Spinner or small mayfly pattern | 18–22 |
| PMDs | Late-stage spinner falls and emergers remain important | 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 |
| Yellow Sallies | Still active along riffles, banks, and pocket water | Morning through late morning | Dry or nymph | 12–16 |
| 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 now daily players | Morning through midday | Ant, beetle, hopper, or small attractor | 10–18 |
| Spruce Moths | Building in timbered sections | Morning through midday | Spruce moth dry | 12–16 |
Tricos, PMDs, caddis, Yellow Sallies, terrestrials, nocturnal stones, and spruce moths are the key insects this week. Golden stones are mostly behind us now, though a smaller leftover stonefly dry can still work as a searching pattern in broken water.
Gear Picks of the Week
Stream Thermometer
This is required summer gear right now. Check water temperatures often, especially on the Bitterroot mainstem, Clark Fork, and Blackfoot.
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, Yellow Sallies, nocturnal stones, terrestrials, and small dry-dropper rigs doing most of the work. As the week warms, the window tightens even more.
The Bitterroot remains the best overall choice, but it is now under hoot-owl restrictions and should be treated as a morning fishery. Rock Creek is the strongest clear-water wade option, the West Fork is clean and technical but low, the Blackfoot has a floating closure to account for, and the Clark Fork should be approached as an early-morning program.
