Western Montana Fly Fishing Report
Regional River Conditions Overview
The Bitterroot, Blackfoot, Clark Fork, Rock Creek, and West Fork are all in summer shape. Flows are lower, clarity is generally good, and trout are concentrating around riffles, shaded banks, deeper slots, foam lines, grassy edges, and cold-water influence where available. Dry-fly fishing can be very good in the morning, especially during PMD spinner falls, Yellow Sally activity, caddis windows, and early terrestrial movement.
Afternoon heat is the main limiting factor this week. Sunday through Tuesday are hot and smoky, Wednesday and Thursday bring shower chances, and Friday and Saturday remain warm. The practical plan is simple: fish early, watch water temperatures, and shift to shaded, oxygenated water as the sun gets higher.
Bitterroot River
Conditions
The Bitterroot is in clear, low-to-moderate summer shape. Flows are around 610 CFS near Darby, around 675–695 CFS at Bell Crossing, and around 1,390–1,410 CFS near Missoula. Morning water temperatures are reasonable, but lower-river afternoon temperatures can climb quickly during hot weather. The best fishing is early, especially on the middle and upper river.
Where to Fish
- Riffle edges with depth and oxygen
- Foam lines along inside bends
- Grassy banks and undercut edges
- Shaded seams near structure
- Tailouts during PMD and spinner activity
- Cold-water influence and faster broken water later in the morning
How to Fish It
- Start early with PMD spinners, cripples, or small mayfly dries in soft seams and tailouts
- Use a small dry-dropper through riffle edges when fish are not visibly rising
- Fish Yellow Sallies, caddis, and small attractors along banks as the day warms
- Use ants, beetles, and small hoppers near grassy banks and shade lines
- Try nocturnal stone or larger attractor dries early along structure
- Use streamers only during low light, smoke cover, or before the sun gets high
- Move upstream, go smaller, or stop fishing when water temperatures climb
Top Patterns
- PMD spinner, emerger, or cripple, size 16–18
- Yellow Sally dry or nymph, size 12–16
- Caddis dry or pupa, size 14–18
- Nocturnal stone dry or nymph, size 6–10
- Golden stone dry, size 8–12
- Ant, beetle, or small hopper, size 10–16
- Olive or black streamer, size 4–8
Blackfoot River
Conditions
The Blackfoot near Bonner is around 1,410 CFS and is in a fishable summer range. The river is still carrying enough volume for float fishing in many sections, but anglers need to pay close attention to water temperatures and the current floating closure below Weigh Station. Golden stones are fading, while PMDs, Yellow Sallies, caddis, ants, beetles, early hoppers, and spruce moths are becoming more important.
Where to Fish
- Morning banks and boulder edges
- Fast riffle edges and oxygenated seams
- Shaded buckets and plunge water
- Inside corners below heavier current
- Foam lines below structure
- Cold-water influence and shaded banks later in the morning
How to Fish It
- Use attractor dry-dropper rigs early along banks and boulder edges
- Fish PMD, caddis, or Yellow Sally droppers through riffles and seams
- Try ants, beetles, and small hoppers around grass and overhanging banks
- Watch for early spruce moth activity near timbered sections
- Streamer fish shaded buckets and deeper banks at first light
- Avoid pushing the afternoon when water temperatures rise
- Do not plan to float through the Weigh Station to I-90 construction closure
Top Patterns
- Golden stone dry, size 8–12
- PMD dry or emerger, size 16–18
- Yellow Sally dry or nymph, size 12–16
- Caddis dry or pupa, size 14–18
- Ant, beetle, or small hopper, size 10–16
- Spruce moth, size 12–16
- Olive, black, or tan streamer, size 4–8
Clark Fork River
Conditions
The Clark Fork is around 2,790 CFS above Missoula and around 4,090 CFS below Missoula. The upper river is in good summer shape, while the lower river is larger and more temperature-sensitive. The Clark Fork can fish well in the morning with PMDs, caddis, Yellow Sallies, nocturnal stones, ants, beetles, and early hoppers, but bright, hot afternoons are increasingly tough.
Where to Fish
- Morning riffle edges and soft seams
- Grassy banks and undercut edges
- Foam lines along inside bends
- Side channels and shallow shelves near depth
- Drop-offs below riffles
- Shaded banks and buckets during smoke or cloud cover
How to Fish It
- Start early with PMD spinners and emergers in soft water
- Use dry-dropper rigs with PMD, caddis, or Perdigon-style droppers
- Fish terrestrial dries tight to grassy banks and inside corners
- Use nocturnal stone patterns early along structure
- Switch to nymphing during bright periods if fish stop looking up
- Streamer fish early or during smoky, cloudy, or stormy windows
- Watch water temperatures closely on lower-river sections
Top Patterns
- PMD spinner, emerger, or dry, 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 hopper, size 10–16
- Perdigon or small jig nymph, size 14–18
- Olive, tan, or black streamer
Rock Creek
Conditions
Rock Creek near Clinton is around 648–664 CFS and clear. It is in excellent wade-fishing shape, but warm afternoons and smoke make timing important. Golden stones are still useful in the right water, but PMDs, Yellow Sallies, caddis, terrestrials, and early spruce moths are becoming the better daily menu.
Where to Fish
- Riffle edges and oxygenated pocket water
- Willow edges and shaded cutbanks
- Boulder cushions and soft pockets
- Tailouts during PMD spinner activity
- Foam lines below faster runs
- Timbered sections if spruce moths begin showing
How to Fish It
- Start with PMD spinners or small dries in soft seams
- 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, especially if moths are visible
- Streamer fish shaded buckets early or during smoke-heavy periods
- Plan on wade fishing, not floating
Top Patterns
- PMD spinner or emerger, size 16–18
- Yellow Sally dry or nymph, size 12–16
- Caddis dry or pupa, size 14–18
- Small foam attractor, size 10–14
- Ant, beetle, or small hopper, size 10–16
- 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 178 CFS. It is clear, low, and technical. This remains the best smaller-water choice in the Bitterroot system, especially for anglers who want cooler morning water, careful dry-fly fishing, and lighter rigs. Fish are more selective now, so approach matters.
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 lighter tippet when fish are spooky
- Start with PMD, 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
- 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 hopper, size 10–14
- Small olive streamer
Planning Note
This is a morning-focused fishing week. Smoke, heat, and afternoon water temperatures are the main concerns. Plan to be on the water early and build your day around the 6:30 a.m. to 11:30 a.m. window. PMD spinner falls, Yellow Sallies, caddis, nocturnal stones, terrestrials, and dry-dropper rigs should all be productive before the sun gets high.
Wednesday and Thursday have shower chances, which may improve Green Drake leftovers, PMD activity, and streamer fishing if cloud cover develops. Saturday looks hot and sunny again, so treat it as an early-only day unless you are fishing colder upper water and checking temperatures carefully.
River Flow Snapshot – July 19, 2026
Values are based on the latest available readings reviewed July 19. USGS readings are provisional and may change during the day.
| River | Section | Gauge | Flow (CFS) | Trend / Status |
|---|---|---|---|---|
| Bitterroot | Upper | Near Darby (12344000) | 610 | Low Summer / Clear |
| Bitterroot | Middle | Bell Crossing nr Victor (12350250) | 675–695 | Low / Technical |
| Bitterroot | Lower | Near Missoula (12352500) | 1,390–1,410 | Clear / Watch Temps |
| Blackfoot | Lower | Near Bonner (12340000) | 1,410 | Fishable / Warm Afternoons |
| Clark Fork | Upper | Above Missoula (12340500) | 2,790 | Summer Flow / Morning Best |
| Clark Fork | Lower | Below Missoula (12353000) | 4,090 | Big Water / Watch Temps |
| Rock Creek | Lower | Near Clinton (12334510) | 648–664 | Clear / Wade Fishing |
| West Fork Bitterroot | Lower | Near Conner (12342500) | 178 | Low / Technical |
Flows are now in summer shape. Fishing is good, but lower and warmer water makes timing, careful handling, and temperature awareness more important than fly selection alone.
Fly Box of the Week
Dry Flies
- PMD spinner, emerger, or cripple, size 16–18
- Yellow Sally dry, size 12–16
- Caddis dry, size 14–18
- Nocturnal stone dry, size 6–10
- Golden stone dry, size 8–12
- Ant, beetle, or small hopper, size 10–16
- Spruce moth, size 12–16
Nymphs
- PMD nymph, size 16–18
- 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 – Mid-July Summer Edition
| Hatch / Insect | Activity | Best Time | Recommended Fly | Size |
|---|---|---|---|---|
| PMDs | Still one of the most important morning hatches | Morning to late morning | Spinner, emerger, cripple, dun, or nymph | 16–18 |
| Yellow Sallies | Active along riffles, banks, and pocket water | Morning through early afternoon | Dry or nymph | 12–16 |
| Caddis | Morning pupa and evening dries where temps allow | Morning and evening | Dry, pupa, larva, or soft hackle | 14–18 |
| Nocturnal Stones | Important early along structure on lower rivers | Early morning | Dark stone dry or stonefly nymph | 6–10 |
| Golden Stones | Fading but still useful as a searching dry | Morning through early afternoon | Foam dry or stonefly nymph | 8–12 |
| Terrestrials | Ants, beetles, and small hoppers are increasingly useful | Late morning through afternoon | Ant, beetle, hopper, or small attractor | 10–16 |
| Spruce Moths | Early activity possible in timbered sections | Morning through midday | Spruce moth dry | 12–16 |
PMDs, Yellow Sallies, caddis, terrestrials, nocturnal stones, and early spruce moths are the most useful insects this week. Golden stones are still worth carrying, but the hatch menu is shifting toward smaller dries and terrestrial patterns.
Gear Picks of the Week
Stream Thermometer
This is the most important tool in the pack this week. Check water temperatures often, especially on the lower Bitterroot, Clark Fork, and Blackfoot.
Fine Tippet and Longer Leaders
Clearer, lower summer water means better presentations matter. Carry 4X, 5X, and 6X for PMDs, caddis, and smaller terrestrial fishing.
Terrestrial Box
Ants, beetles, and small hoppers are becoming more useful each week. Keep them ready for grassy banks, shade lines, and slow edges.
Strategy and Expectations This Week
This is a productive but temperature-sensitive fishing week. The best action should happen early, with PMD spinners, caddis pupa, Yellow Sallies, nocturnal stones, and small dry-dropper rigs carrying most of the load. As the week warms, the window tightens.
The Bitterroot remains the best overall choice. The Blackfoot is good but has a floating closure to account for. The Clark Fork can fish well early but gets more heat-sensitive later in the day. Rock Creek is a strong wade-fishing option, and the West Fork is clean and technical but low.
