Bitterroot River Fishing Report, May 13, 2026

Conditions At-a-Glance

• Flows: High and elevated — ~8,400 cfs near Missoula, slowly dropping; 3,500–3,900 cfs at Darby (historically above "good" fishing flows)
• Water clarity: Off-color to muddy on the mainstem; clearer in the upper river around Hamilton and Darby, and in the East/West Forks and side channels
• Water temp: ~52°F mid-day, cold but trending up
• Quality rating: Tough but fishable — sub-surface and streamer game is the play; evening dries are the bright spot in the upper river

Safety alert. Snowmelt push has river running high and fast — wade and float with caution. Kingfisher flags an obstruction near Poker Joe, and Grizzly Hackle reports multiple downed trees this season, some in dangerous spots. Call ahead for current hazard info before launching.

Conditions Narrative Another push of snowmelt has the Bitterroot dirty and high through the mainstem, with the river fluctuating between 3,500–3,900 cfs at Darby and sitting around 8,400 cfs near Missoula and slowly dropping. The classic dry-fly setup is off the table on the lower river right now, but warming weather is driving steadier bug activity across the system — BWOs, midges, emerging March Browns, and the first Mothers Day Caddis are all showing, with golden stones just starting to wake up. The most reliable dry-fly action right now is in the upper river (Hamilton, Darby, the East and West Forks) and during evening windows when hatch activity peaks. Lingering Skwala adults are still being seen in clearer side channels per Freestone. Late-season Nemoura and Capnia stoneflies remain in the mix per the Missoulian Angler's prior report.

Best Techniques

Nymphing — primary tactic. Focus on slower seams, inside bends, soft pockets along the bank, and deeper transition water. Get bugs down quick. Worms and stonefly nymphs are the way to go in dirty water; mayfly nymphs are picking up as water temps climb.

• Stoneflies: Pat's Rubber Legs, TJ Hooker
• Worms: San Juan Worm
• Mayflies: Pheasant Tails, Hare's Ears, Frenchies, Blowtorches, Duracells, Perdigons

Streamers — still very much in play. Higher dirty water rewards flashy, high-contrast patterns fished slowly through structure and deeper buckets. Think black, white, or natural tones; small-to-medium profiles that get down quickly.

• Sparkle Minnows, Goldie, Kreelex, Mini Dungeons, Masked Avengers, Two Tones

Dry fly — limited but worth a box on the seat. Evening hatches in clearer water are the bright spot, especially in the upper river. Watch for risers to caddis and Gray Drakes when surface activity picks up.

• BWO and mayfly patterns: Rio's Film Critic – BWO, On Point Para Wulff – BWO, Carlson's Olive Haze, Stranahan's Brindle Chute, MFC Hot Spot Para-Wulff – Brindle
• Searching dries / Skwala holdovers: Plan B (Black/UV Black and Black/Purple variants)

Hatches

• Blue-Winged Olives — present throughout the day, evening windows strongest
• March Browns — increasingly strong hatches
• Mothers Day Caddis — beginning to show up
• Golden Stones — first emergers (single sightings only so far)
• Skwala — late-season holdovers in clearer side channels
• Midges and the occasional midge cluster
• Nemoura, Capnia — small early-season stoneflies (per Missoulian Angler, ~4 weeks ago)

Where to Fish The mainstem is tough to fish effectively at peak runoff. Better clarity in the upper river (Hamilton, Darby), the East Fork and West Fork, and back channels, soft edges, and tributary mouths. Inside bends and slower banks on the mainstem will hold fish willing to eat a worm.

7-Day Outlook Mostly cloudy skies today with a high around 70°F, warming through the week to 83°F by Wednesday. A ~35% chance of light rain mid-week ahead of partly sunny conditions returning Thursday. The river is in the heart of runoff — expect flows to stay high for the next several weeks. Clarity and dry-fly opportunity should ramp back up as runoff stabilizes; late May into June should bring solid fishing, especially as golden stones enter the mix in earnest.

The Fly Box

Nymphs: Pat's Rubber Legs, TJ Hooker, San Juan Worm, Frenchies, Duracells

Dries: Film Critic, On Point Para Wulff, Carlson's Olive Haze, Brindle Chute, Hot Spot Para-Wulff, Plan B

Streamers: Sparkle Minnows, Goldie, Kreelex, Mini Dungeons