Blackfoot River Fishing Report: May 18, 2026
The whole Missoula-area system is in spring-runoff mode. The Bitterroot peaked near 11,600 CFS on Friday 5/15 and has been dropping with the cool weekend; the Blackfoot is dropping from a 7,000 CFS peak (4,600 this morning); Rock Creek is around 1,500–1,800 CFS and still high; the Clark Fork is high and off-color, with the upper river fishing better than the lower. Tributaries open Saturday 5/16 this year. The week ahead clears up Monday with highs climbing back into the 60s — fishing should improve daily as flows drop and clarity returns. Best window most days is roughly late-morning through afternoon.
Conditions at-a-glance: High and dirty · visibility off-color · water temp ~50°F · 4,600 CFS at Bonner (dropping from 7,000 peak) · Grizzly Hackle: 1/5
Warning: Tributaries do not open until Saturday 5/16 this year. The Blackfoot typically lags the other area rivers in warming, so consistent topwater action is still a bit early.
Conditions. The Blackfoot is fishing tough because the high water has pushed all the soft holding water up into the willows on the banks. Wade carefully and focus on those extremely tight margins. The cold snap dropped water temps below salmonfly threshold, but flows and clarity are both trending in the right direction. The upper river is offering the best overall conditions.
Best techniques.
- Streamer fishing pulls aggressive fish out of heavy cover along the willows.
- Dry-dropper or bobber rig run right on the willow edges with a Rubber Legs, TJ, or San Juan Worm underneath.
- Nymphing is tough in the heavy current; when you do, run heavier rigs with stonefly nymphs, squirmy worms, and smaller mayfly patterns like Pheasant Tails and perdigons.
- For streamers, off-color water favors larger, high-contrast patterns. Sparkle Minnow, Kreelex, Woolly Buggers, and sculpin patterns are producing — fish them slow and deep along structure.
Hatches & flies. Hatches are limited but caddis and BWOs are showing on warmer afternoons; March Browns are sporadic. Salmonflies are right around the corner — have a few in the box. Blackfoot River Outfitters' featured dries this week: Elk Hair Caddis, Furminksy's Fluttering Foam Caddis, Goddard Caddis, Carlson's Purple Haze, MFC Hot Spot Para-Wulff (Brindle and Green Drake variants), and Stranahan's Brindle Chute. Grizzly Hackle calls for nymphing Pat's Rubber Legs, SJ Worms, Wire Worms, and Zirdles.
Outlook. Cool, wet weekend (highs in the 40s, rain/snow showers through Sunday near Ovando). Monday onward clears up with highs climbing into the upper 50s and low 60s by week's end. Salmonfly season prep is the theme — flows and clarity should keep improving.
