Bitterroot River Fishing Report, July 17, 2026

2026-07-17 (July 17, 2026)

Regional summary

Not much has moved on the calendar in the three days since the last report, and yet the season keeps inching forward. Every valley gauge is a notch lower than it was, the water keeps clearing, and the bug board has finished its handoff: the big stoneflies that carried June are essentially done, and trout have settled into a steady summer diet of PMDs, Yellow Sallies, caddis, Green Drakes on the gray days, and the first real wave of terrestrials. The one variable running the whole show is heat. Mornings still start cool and friendly, but midday water is now creeping into the upper 60s and low 70s on the valley rivers, so the productive clock has slid hard toward early and late. The other new wrinkle is a regulation change worth knowing before you load the boat: the Blackfoot closed to floating from Weigh Station down to the I-90 bridge on July 15, running through October 31. Carry a thermometer, start at first light, get fish in and released quickly in the warm afternoons, and check Montana FWP for restrictions before every trip, since nothing was posted when the shops filed but a hot week can flip that overnight.

At a glance: Best all-around bet in the region | good clarity valley-wide, dropping | low-to-mid 50s upper, ~64°F Darby into ~71°F near Missoula midday | ~645 CFS Darby / ~702 Bell Crossing / ~1,520 near Missoula (live USGS, down from ~751/963/1,900 last report) | GH rating: 4/5 | Best window: early and late

Float hazard: downed trees and log jams remain a real hazard. and the fast-dropping water makes them more dangerous, not less. A few spots are genuinely bad this year. Scout blind corners and call a valley shop for current down-tree information before you launch.

The Root keeps the crown for another week. It is still dropping but holds good clarity from the East Fork to the Clark Fork confluence and sits in classic midsummer shape, the most complete fishery around Missoula for mixing dry-fly, dry-dropper, nymph, and streamer work in a single day. The whole system is in a legitimate multi-bug phase: PMDs carry the afternoon, Golden Stones (the valley's "Bitterroot stones") are fading but still eaten, and Yellow Sallies and caddis fill in around them. Hopper fishing improves a little more each day. Fish are looking up and spread across riffle edges, grassy banks, willow lines, side channels, foam lines, and tailouts, and they hold tight to the bank in the first few hours of light. Wade anglers should still respect the flow and pick crossings with care, and near Missoula the midday water is now bumping the low 70s, so the afternoon break matters most on the lower river.

Best techniques

• The workhorse is a dry-dropper: a Chubby Chernobyl, Water Walker, or Golden Stone in #8-14 up top, trailing a hot-spot Perdigon, Jigged Pheasant Tail, Frenchie, Jig Hare's Ear, or Caddis Pupa 18 to 24 inches below. Pat's, a TJ Hooker, or a Zirdle covers the deeper stonefly water.
• As the afternoon hatch thickens, switch to the single dry: a PMD Sparkle Dun, Purple Haze, Hot Spot Para-Wulff, Film Critic PMD, or a Brindlechute for the mayfly eaters; a Plan B or Yellow Sally for the smaller stones; X-Caddis and Elk Hair Caddis when the caddis get going late. A Morrish Hopper or flying ant tight to grassy banks is already turning afternoon fish.
• Streamers buy the bigger fish early and between hatches, white, yellow, and olive leading, stripped along cutbanks and woody structure for the river's larger browns. Freestone in Hamilton and Lightweight in Stevensville both sit right on the valley water and will have the freshest read on which reach is fishing; worth the swing on the drive south.

Hatches

Full summer spread: PMDs the afternoon headliner, Golden Stones fading but still eaten, Green Drakes on cloudy days, Yellow Sallies along banks and riffle edges, caddis late, the first spruce moths, and ants, beetles, and hoppers filling the gaps.

The Fly Box

Nymphs: Pat's Rubber Legs, TJ Hooker, Zirdles, Frenchies, Split Case PMDs, Psycho May, Caddis Pupa, Jigged Pheasant Tail, Perdigons, Hare's Ears

Dries: Chubby Chernobyls, Water Walkers, Plan Bs, Golden Stones, PMD Spinners, Green Drakes, Yellow Sallies, PMD Sparkle Dun, Film Critic PMD, Brindlechute, Purple Haze, Hot Spot Para-Wulff, Parachute Adams, Elk Hair Caddis, X-Caddis, Morrish Hopper, Ants and Beetles

Streamers: Sparkle Minnows, Thin Mints, Mini Dungeons, Peanut Envy, Sculpzilla, Woolly Buggers

Outlook. Hot around Hamilton with a heavy thunderstorm chance today, more heat Saturday, and warm conditions continuing into next week. The Root should keep fishing exceptionally as it drops; move the day earlier as the heat builds and watch the lower-river afternoon water temperatures by week's end.

Sources and Thanks

Shop	Report date	Coverage
Kingfisher Fly Shop	July 17, 2026	All four rivers (freshest)
The Missoulian Angler	July 16, 2026	All four rivers
Blackfoot River Outfitters	July 10, 2026	All four rivers
Grizzly Hackle	July 10, 2026	All four rivers
Freestone Fly Shop	July 12, 2026	Bitterroot only
Lightweight Fly Shop	July 5, 2026	All four rivers, consolidated weekly