Clark Fork River Fishing Report: May 14, 2026

Regional headline: warm weather has pushed Western Montana into full runoff. All four rivers are high, off-color, and pushy. The Bitterroot is the most fishable option this week — and only because of its side channels and protected edge water. Subsurface (worms, big stonefly nymphs, dark streamers) is outfishing dries everywhere; the dry-fly bite is best held for cloudy afternoons and clearly rising fish in soft water.

At-a-glance: Upper Clark Fork ~7,490 CFS / Lower ~8,600–16,000 CFS · Water temp ~51°F · Water high and off-color (mud below town) · Grizzly Hackle: 1/5 · Best window: 11:00 a.m. – 3:00 p.m. · Hatch focus: tail-end March Browns, BWOs, Mother's Day Caddis starting, early Fluttering Stones (Golden)

The lower Clark Fork (below Missoula) is running ~16,000 CFS — serious volume. Float only with strong oar skills, and stay off the main channel push. Stay tight to soft edges.

The lower Clark Fork is muddy and big; the upper river (above Rock Creek confluence) has decent clarity but is dragging weeds, detritus, and "mysterious plant growth" through any drift. Kingfisher reports occasional risers in back eddies and slower seams during warm windows; Grizzly Hackle confirms the upper is "slightly more favorable" but still hit-or-miss. Lightweight calls it serious volume — fish less water, better.

Best techniques:

• Nymph deep in softer edge water — inside seams, slower buckets, transition water. Heavier indicator rigs with stonefly nymphs and worms over Pheasant Tails, Frenchies, dark perdigons, Blow Torches, Duracells, and Prince Nymphs.
• Streamers fished slow and tight to banks and current breaks. Dark colors — black, purple, olive — in the muddy below-town water; switch to white and gold (Sparkle Minnows, Masked Avengers) in clearer side channels and the upper river.
• Opportunistic dries only when fish are clearly rising in soft pockets — keep dries handy but don't force them.

Hatches & flies:

• Tail-end March Browns, BWOs, Mother's Day Caddis starting to build, and the very beginning of the Fluttering Stone hatch (Golden Stones — Kingfisher saw a single adult).
• A few stray Skwalas and Gray Drakes (per Grizzly Hackle) may move a fish in protected water.
• Dry options when needed: Carlson's Purple Haze, BWO Comparadun, Last Chance Cripple, Parachute Adams, X-Caddis, Corn-Fed Caddis, Chubbies, Hi-Vis Micro Chubby, Stranahan's Brindle Chute, On Point Para Wulff (BWO), Plan B (Black/Purple).
• Streamer favorites named: Mini Dungeons, Gongas, Woolly Buggers, Goldies, plus those bright Sparkle Minnows and Masked Avengers for cleaner water.
• Nymph staples: San Juan Worms, Zirdles, stonefly nymphs.

Outlook: A 35% chance of light rain Wednesday could nudge flows back up, then clearer skies should return by Thursday. The upper Clark Fork is probably playable now for anglers willing to manage weed slop; the lower will need weeks before it's back in good shape.