Montana ·
Stillwater River Fly Fishing Report - September 6, 2026

STILLWATER RIVER
ReportSEP 6 — 13, 2026
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Flow
382CFS
Stillwater River near Absarokee, MT
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Water Temp
61.5°F
Updated 2026-09-06
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Weather
53–86°F
Mostly Clear
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Clarity
Clear
Check post-storm
Flow is running at 382 CFS with a gauge height of 1.55 ft — low, clear, and wade-friendly — and water temps are a comfortable 61.5°F, keeping fish active through midday. With sunny skies pushing highs to 86°F today, get on the water early before afternoon heat pushes fish tight to shade and structure.
What's Working — Hot Flies

Bionic Hopper - Tan #12
#12

Bionic Hopper - Purple #12
#12

Bionic Ant 2.0 - Black #16
#16

Bionic Ant 2.0 - Brown #12
#12

Corn-fed Caddis (CDC) Tan #20
#20

Parachute - Blue Wing Olive #22
#22

Egan's Frenchie #12
#12

Egan's Thread Frenchie Jig - Olive #12
#12

Soft Hackle Pheasant Tail Jig - Barbless #12
#12

Juju Baetis Tungsten #22
#22

Coffey's CH Sparkle Minnow Sculpin #6
#6

Tungsten Pat's Rubber Legs - Tan & Brown #6
#6
Hatch Chart
| Insect | Size | Activity | Prime Time |
|---|---|---|---|
| Grasshoppers | 10-14 | Heavy | 10 AM - 3 PM |
| Caddis | 16-20 | Moderate | 7 AM - 10 AM |
| Blue-Winged Olive (Baetis) | 18-22 | Moderate | 4 PM - 7 PM |
| Ants / Terrestrials | 14-18 | Moderate | 11 AM - 4 PM |
| Midges | 20-24 | Light | 7 AM - 9 AM |
Best Time Window
- 6:30 AM - 9:30 AM: Early caddis and midge activity in riffles and tailouts — dry fly and nymph both productive before the sun fully hits the water.
- 10 AM - 1 PM: Prime hopper and terrestrial window as sun warms the banks — work grassy edges and cut banks hard with big foam patterns.
- 5 PM - 7:30 PM: Late-day BWO emergence in slow runs and flats — switch to small dries and emergers as fish begin rising in the evening light.
Guide's Tip
From the benchWith the river running low and clear at 382 CFS and temps at 61.5°F, fish will be spooky — stay low, approach from downstream, and keep your casts short. In the morning, work caddis and ant patterns through the riffles before switching to hoppers once the sun hits the banks around 10 AM. Slap hoppers hard against grassy cut banks on the far shore and give them a full second to settle before starting your drift — that pause is where the eat happens. As afternoon temps climb toward 86°F, push fish to the shade of deep runs and boulder pockets with a heavy nymph fished tight to the bottom.
Main Species
Rainbow Trout
Brown Trout
Yellowstone Cutthroat Trout
