Clark Fork River Fishing Report, July 28, 2026
2026-07-28 (July 28, 2026)
Regional summary
Little has changed on paper since the last report, and that is exactly the story: the late-July regime that arrived with the July 22 restrictions has settled in and hardened. The entire Bitterroot mainstem and the Upper Clark Fork (Warm Springs and Silver Bow confluence down to Flint Creek) remain under hoot owl, closed to angling from 2:00 p.m. to midnight. Flows took another step down across the board this week, clarity is gin, and the productive hours contracted again. Lightweight now posts a 6:00 to 10:30 a.m. best window, a half hour earlier on both ends than a week ago. What did change is on the water, not in the rules. Spruce moths went from rumor to results, with fish eating them mid-morning on the Blackfoot and Rock Creek. Tricos have taken real ownership of the glassy morning water, PMD spinner falls anchor first light, caddis still close the day where the rules allow, and the terrestrial bench of hoppers, ants, and beetles is now the main event rather than the warm-up act. One more thing the week's storms left behind: new wood. Fresh downed trees are being reported on the Clark Fork, and every shop in town is telling floaters to expect the unexpected around blind corners. Carry a thermometer, fish the dawn, and read the FWP restrictions page before every launch.
At a glance: Fishing well for those who beat the sun | ~1,750–1,830 CFS above Missoula (95% of median), ~2,560 below | 71°F midday | dropping and clear | GH rating: 3/5 | Best window: 6:00–10:30 a.m. | Upper river on hoot owl (2 p.m. to midnight), Warm Springs to Flint Creek
Float hazard: two new trees down. One between Turah and Sha-Ron about half a mile above the Blackfoot confluence, and a second between Clinton and Turah. Both are fresh reports this week. Scout ahead and get the latest before floating either stretch (Blackfoot River Outfitters is tracking both at 406.542.7411).
The Clark Fork remains the quiet overachiever of the valley. The upper river is going low, warm, and weedy (the reaches above the mouth of Rock Creek are fairly socked in), and it carries the hoot owl closure from the Warm Springs confluence to Flint Creek. But from Missoula down, the river is arguably fishing the best of the four, with trout stacked along bank edges, undercut grass, riffle corners, and the deep eddies where the current keeps the thermometer honest. The catch is the clock. Afternoons bring heat, warm water, and a flotilla of tubers, so the fishing day starts at dawn and ends when the temperature says so, not when you do.
Best techniques
- Run the foam-and-dropper program along the soft margins: a Chubby Chernobyl, More or Less Hopper, Sweetgrass Hopper, Henneberry Hopper, Juicy Hopper, or Water Walker up top in tan, yellow, or purple, with a Frenchie, Spanish Bullet, Perdigon, or Blowtorch hung three to four feet below.
- Nymph the bright hours on the stonefly bench first (Pat's RLs, Explosion Stones, Twenty Inchers, TJ Hookers, Zirdles), then let the small stuff finish the job: Shuck Its, Jig PTs, Prince Nymphs, Psycho May, Split Case PMDs, and Caddis Pupa through the eddies, riffles, and buckets. Start the dropper deep, three to five feet, and lift it as the day warms.
- Early risers get the good dry-fly work: PMD spinners and Tricos in the #16-20 range on the slicks, a #16-18 flying Ant or beetle in the morning foam lines, and a Corn Fed Caddis or X-Caddis when caddis show. The streamer bite is the sleeper: white, yellow, and olive are the tickets, with the Yellow Yummy, Rusty Trombone, Kreelex, and Lil' Kim all earning fish. Grizzly Hackle floats this river daily and grades it honestly every week; five minutes at their counter beats an hour of guessing at the ramp.
Hatches
PMDs with morning spinner falls, Tricos in the slow lanes, Yellow Sallies steady, caddis mornings and again at dusk, nocturnal stones along structure at first light, and hoppers, ants, and beetles gaining ground daily as the Golden Stones fade to memory.
The Fly Box
Nymphs: Pat's Rubber Legs, Explosion Stones, Twenty Inchers, TJ Hookers, Zirdles, Blowtorches, Frenchies, Shuck Its, Jig PTs, Prince Nymphs, Split Case PMDs, Psycho Mays, Perdigons, Spanish Bullets, Caddis Pupa, Jigged Hare's Ears
Dries: Chubby Chernobyls, Water Walkers, More or Less Hoppers, Sweetgrass Hoppers, Henneberry Hoppers, Juicy Hoppers, PMD Spinners, Tricos, Yellow Sallies, Corn Fed Caddis, Elk Hair Caddis, X-Caddis, Purple Haze, Parachute Adams
Streamers: Yellow Yummies, Rusty Trombones, Kreelex, Lil' Kims, Barely Legals, Sparkle Minnows, Mini Dungeons, Peanut Envy, Sculpzilla, Thin Mints, Woolly Buggers
Outlook. Missoula bakes in the 90s through the weekend and into next week with wall-to-wall sun. Expect the upper river to stay marginal, the town-and-west water to stay the play, and the closure boundary to be worth re-checking daily if the heat digs in.
Sources and Thanks
| Shop | Report date | Coverage |
|---|---|---|
| Kingfisher Fly Shop | July 27, 2026 | All four rivers (freshest) |
| Blackfoot River Outfitters | July 24, 2026 | All four rivers |
| Grizzly Hackle | July 26, 2026 | All four rivers |
| Lightweight Fly Shop | All four rivers, consolidated weekly | |
| The Missoulian Angler | July 26, 2026 | All four rivers, background |
