Montana ·
Yellowstone River Fly Fishing Report - June 14, 2026
YELLOWSTONE RIVER
ReportJUN 14 — 21, 2026
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Flow
6230CFS
Yellowstone River at Corwin Springs MT
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Water Temp
53.8°F
Updated 2026-06-13
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Weather
38–79°F
Mostly Clear
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Clarity
Clear
Check post-storm
The Yellowstone at Corwin Springs is running 6,230 CFS at 4.5 ft gauge height with a water temp of 53.8°F — down sharply from the 9,400+ CFS peak earlier this month and clearing steadily in the warming June sun. Expect continued improvement through the weekend as daytime highs push into the low 70s; fish are moving off the banks and into feeding lanes as visibility improves.
What's Working — Hot Flies
Tungsten Pat's Rubber Legs - Tan & Brown
#6
Olsen's Straggle Stone Brown Barbless
#12
Wiggly Worm (TBH)
#8
Coffey's CH Sparkle Minnow Sculpin
#6
Sculpzilla - Olive
#4
Blowtorch - Hare's Ear
#12
Egan's Thread Frenchie Jig - Olive
#12
Egan's Silver Bullet - Baetis
#14
Tungsten Split Case Nymph - PMD
#20
Parachute - Blue Wing Olive
#22
Corn-fed Caddis (CDC) Tan
#20
Corn-fed Caddis (CDC) Olive
#20
Hatch Chart
| Insect | Size | Activity | Prime Time |
|---|---|---|---|
| Salmonfly / Golden Stone (Nymph) | #6–8 | Building strong sub-surface ⭐⭐⭐⭐ — adults not yet on the water; dredge deep along cut banks and boulder structure | All Day (sub-surface) |
| Blue-Winged Olive (Baetis) | #18–22 | Active ⭐⭐⭐⭐ — best on overcast or partly cloudy windows; look for sipping risers in slower seams and back eddies | Morning – Midday |
| Caddis (Mother's Day / Tan) | #14–16 | Active but tapering ⭐⭐⭐ — fish foam lines and current seams; adults visible in afternoon warmth | Afternoon – Evening |
| Pale Morning Dun (PMD) | #16–20 | Just starting ⭐⭐⭐ — nymph and emerger patterns most effective as hatch gets established; expect to build through the week | Morning |
| Midge | #20–22 | Steady ⭐⭐ — consistent in slower back eddies and tailouts throughout the day | Early Morning |
Best Time Window
- 7:00 AM – 10:00 AM: Prime BWO and midge window in slower back eddies; nymph the deeper runs with stonefly patterns before the sun hits the water
- 11:00 AM – 3:00 PM: Best overall nymphing and streamer window as water temps climb toward peak feeding range (53–58°F); work cut banks and structure with heavy rigs
- 5:00 PM – Dusk: Caddis adults on the water — switch to CDC dry flies along foam lines and current seams as the afternoon light fades and surface activity picks up
Guide's Tip
From the benchWith the Yellowstone at 6,230 CFS and dropping fast in this low-snowpack year, focus your morning on the inside seams and soft water behind large boulders where trout are stacking up to feed without fighting the main current. Load up on split shot and get your stonefly nymphs to the bottom — the fish are there, they're just not going to move far for a fly. As the river continues to clear through the weekend and temps push into the 70s, watch for the first salmonfly adults to appear along the willowy banks near Corwin Springs, which could trigger some explosive dry fly action by late June.
Main Species
Yellowstone Cutthroat Trout
Brown Trout
Rainbow Trout
