5/31/2026: Missouri River Fishing Report

Summary

The Missouri is acting more like a freestone than a tailwater, with low water driving pronounced daytime warming the further you get from the dam. PMDs are on in numbers, caddis are building, and trout are in their peak metabolic window but increasingly educated. Near-term weather is split between a wet front and a warm-up.

At a glance: ~3,300 CFS at Holter, low for the date | Clear, tailwater normal | 54 to 56°F | Split forecast, rain for several days then 80s to 90s | PMDs in numbers, BWOs waning, caddis building, midges daily, Pseudos

The Missouri is acting more like a freestone than a tailwater right now. Low water (~3,300 CFS at Holter, well below the 6,000 to 10,000 CFS that is historically normal for late May) means daytime warming and overnight cooling are pronounced the further downriver you go from the dam. Trout are sitting in the peak of their metabolic zone, eating consistently, but increasingly educated by the steady angler traffic of the past two weeks.

Near-term weather is genuinely split between the freshest sources. Headhunters (May 28) is calling rain for the next four days and pushing rain-gear; The Trout Shop (May 28) is calling 80s to 90s through the rest of the week. Both can be true, likely a wet front near-term followed by warming as the week stretches. River temps are holding in the mid-50s, which is the metabolic sweet spot.

The hatch board is the headline shift since last report. PMDs have been present three weeks and are now in numbers across the whole river, the dominant mid-day mayfly. BWOs are still hanging on but waning. Caddis are building and the shops are watching for a real flourish if the warm window persists. Pseudos (micro mayflies, Pseudocloeon) are also on the water at varying times during the day. The midge hand keeps playing.

Three columns all in play. Nymphing remains the bread-and-butter, especially early, sows and worms near the dam, mayfly nymphs across the rest of the river. Dry-fly fishing was excellent last week under calm overcast skies with fish working PMDs all over the river, but the fish have been educated and reach casts / fly-first / long-leader presentations are now the price of admission. Streamer fishing has faded into the wind per Headhunters and is best worked low-light or when the sun is off the water.

Best techniques

• Nymphing is the default. Cross Currents's depth protocol: 6 to 7 ft deep in the morning with a worm or sow as the lead fly; 3 to 5 ft in the afternoon as fish key on emerging bugs in the upper column. Target inside bends and slow water early, then hard seams, swirlies, and fast shallow bank water as the day warms. Smaller brown and olive nymphs in #16 and #18 are the right tier.
• Dry-fly fishing requires the A-game. Long leaders, accurate casts, fly-first presentations. Reach casts and slack-line presentations for risers, on anchor or on foot. Hail Mary chuck-and-pray will not cash out at this point in the season per Headhunters.
• Dry-dropper with a larger mayfly or Chubby up top, suspending a small nymph below, the go-to in skinny water. Chubby over a Micro May or Frenchie is hard to beat; an occasional big brown will light up the Chubby on the drift.
• Soft-hackle swing time is late morning to early afternoon, especially on a trout spey rig. The Trout Shop's worked example: a Gold Tung Dart (caddis pupa) over a Partridge and Yellow (PMD imitation), targeting fish swirling below the surface in shelves and bucket water.
• Streamers work best low-light, before the hatch, after the bugs have flown, or when the sun is off the water. Heavier sink tips or sinking leaders to get the fly down; the fish are noncommittal in bright sun and will follow without striking. Don't expect to fish streamers all day right now.

Hatches

The Fly Box

Nymphs: Micro May, Frenchie, Split Case, Psycho May, Spanish Bullet, Warrior Perdigon, Two Bit Hooker, Crust Nymph, Fullback Napoleon, Green Machine, Lightning Bugs, Blow Torch, Pill Popper, Tailwater Sow, Wire Worm, Zirdle Bug

Emergers: Partridge and Yellow, Loop Wing Emerger, Captive Dun, Sprout Baetis

Dries: Chubby, Film Critic, Purple Haze, Adams, Royal Wulff, Split Flag, Hi-Vis Rusty Spinner, Corn-Fed Caddis, Missing Link Caddis

Streamers: Kreelex, Sparkle Minnow, Lil' Kim, Skiddish Smolt, bugger, Thin Mint, Montana Intruder, Mini Sculpin, Mini-Dungeon, Micro Dungeons, Micro Peanut Envy, Sex Dungeon, Space Invaders

PMD (Ephemerellidae): PMDs have been present three weeks and are the headline. The dry window was exceptional last week under calm overcast; expect educated fish going forward. Nymphs: Frenchie, Split Case PMD, Psycho May (also PMD Psycho Mays), Spanish Bullet (TS's "Spanish Perdigon" is the same pattern), Warrior Perdigon, Micro May, PMD Perdigon, Two Bit Hooker, Black IPT, Crust Nymph, Tung Jig Pheasant Tail, Tung Jig Hares Ear, Fullback Napoleon. Emergers / Cripples: Sprout PMD Emerger, Film Critic, Loop Wing Emerger, Captive Dun. Soft hackle: Partridge and Yellow, PMD Soft Hackle. Dries: Purple Haze, Adams, Purple Para Wulff, Royal Wulff, Sparkle Flag, Split Flag, Brianne Dun, CDC Para Spinner, Hi-Vis Rusty Spinner

BWO (Baetis): Nymphs: Green Machine (also PT Green Machine), Frenchie, Magic Fly, Redemption, Gold Lightning Bugs, Weight Fly. Emergers: Sprout Baetis, Film Critic. Dries: Same dry roster as PMDs above, Purple Haze, Adams, Sparkle Flag, Split Flag, Brianne Dun, CDC Para Spinner, Hi-Vis Rusty Spinner

Caddis: Shops are watching for a real flourish if the warm window persists. Wind has kept the surface bite tighter than the sub-surface bite. Pupae / Emergers: Tung Dart (Gold), Blow Torch (also Red Bead Blow Torch). Dries: Corn-Fed Caddis, Missing Link Caddis

Midge (Chironomidae): The midge hand never stops on the Mo. Fold midges into any indicator rig

Sows & scuds: Pill Popper, Tailwater Sow (natural grey and rainbow variants both in play near the dam)

Worms: Wire Worm as the deep lead-fly in the morning is the consensus across Cross Currents and the Trout Shop

Streamers: Flashy / smolt: Kreelex, Sparkle Minnow, Lil' Kim, Skiddish Smolt. Dark / leechy / sculpin / bugger: Bam Bam, Thin Mint (also Thin Mint Bugger), Trout Spey Bugger, Mini Montana Intruder, Mini Sculpin, Mini-Dungeon, Micro Dungeons, Micro Peanut Envy, Peacock and Black Bugger, Sex Dungeon (the Trout Shop calls out a big, white Dungeon for the bold), Gamechanger, Zirdle Bug, Space Invaders

Outlook. Near-term weather is genuinely split between the freshest sources. Headhunters is calling rain for the next four days; The Trout Shop is calling 80s to 90s through the rest of the week. The likely shape is a wet front pushing through followed by warming. Expect PMDs to continue as the headline through the week, BWOs to continue thinning, caddis to build toward a real flourish if the warmth holds, and midges to continue as the all-day reliable. Fish are in their peak metabolic window and feeding consistently, the constraint is angler skill against increasingly educated fish, not fish activity. Crowds remain heavy as western Montana rivers continue their runoff; courtesy on the water still pays.

Sources and Thanks

Shop	Report date	Coverage
Headhunters Fly Shop (Craig)	May 28, 2026	Missouri River
The Trout Shop (Craig)	May 28, 2026	Missouri River
Cross Currents Fly Shop (Craig)	May 26, 2026	Missouri River
Wolf Creek Angler (Wolf Creek)	May 14, 2026	Missouri River