Montana ·
Bighorn River Fly Fishing Report - October 27, 2026

BIGHORN RIVER
ReportOCT 27 — NOV 3, 2026
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Flow
1750CFS
Bighorn R bl Yellowtail Afterbay Dam nr St. Xavier
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Water Temp
—
Updated 2026-10-27
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Weather
32–59°F
Sunny
💧
Clarity
Clear
Check post-storm
Flow is running at 1,750 cfs with a gauge height of 61.04 ft — slightly up from last week but still in prime nymphing shape with clear water and well-defined lanes. Expect a stiff WSW wind of 17–22 mph today, so position yourself to cast across or downstream to keep your drift clean.
What's Working — Hot Flies

Tailwater Sowbug - Rainbow #10
10

Tungsten Tailwater Sowbug - Rainbow #10
10

Pheasant Tail Tungsten #20
20

Juju Baetis Tungsten #22
22

Parachute - Blue Wing Olive #22
22

Barr's Flashback Emerger - BWO #22
22

Black Zebra Midge(TBH) #20
20

Egan's Frenchie #12
12

Top Secret Baetis #16
16

Roza's World Spain Perdigon Barbless #18 - 32
18

Coffey's CH Sparkle Minnow Sculpin #6
6

Guides Choice Hare's Ear #18
18
Hatch Chart
| Insect | Size | Activity | Prime Time |
|---|---|---|---|
| Baetis (Blue-Winged Olive) | 20-22 | Heavy | 11 AM - 3 PM |
| Midge | 20-24 | Moderate | 9 AM - 12 PM |
| Sowbug / Scud | 16-18 | Heavy | All Day |
| Caddis | 18-20 | Light | 2 PM - 5 PM |
| PMD | 18-20 | Light | 12 PM - 2 PM |
Best Time Window
- 8 AM - 10 AM: Prime midge and sowbug nymphing in the deeper runs before the wind builds — get your best drifts in early.
- 11 AM - 2 PM: BWO hatch window; watch for rising fish in the slower flats and be ready with a dry or emerger on a fine tippet.
- 4 PM - Dusk: Low-light streamer time — swing or strip a Sparkle Minnow through the deep pools as big browns move shallow to feed.
Guide's Tip
From the benchWith the wind running 17–22 mph out of the WSW today, your best move is to work the river from a downstream position and cast upstream at a slight angle so the wind is at your back or quartering — this keeps your indicator tracking true and your mend effective. Set your indicator depth to about 1.5x the water depth in the main nymphing runs, and don't be afraid to add a small split shot 8 inches above your lead fly to stay on the bottom in the 3–5 ft seams. The BWO hatch will fire between 11 AM and 2 PM — watch for subtle sipping rises in the slower, glassy water along the banks and be ready to switch to a dry or emerger quickly. As the afternoon cools toward 55°F, transition to streamers in the deeper pools for the big browns that are actively feeding ahead of the cold nights.
Main Species
Brown Trout
Rainbow Trout
Mountain Whitefish
