Montana ·
Madison River Fly Fishing Report - October 4, 2026

MADISON RIVER
ReportOCT 4 — 11, 2026
🌊
Flow
—CFS
🌡️
Water Temp
—
☀️
Weather
39–74°F
Mostly Clear
💧
Clarity
Clear
Check post-storm
Live USGS gauge data is unavailable today, but recent web intel from October 1 puts flows at roughly 655–861 CFS depending on section — low, clear, and technical conditions that demand precise presentations. Water temps were sitting at a fish-friendly 58.6°F late last week, and with a sunny 73°F day ahead and calm winds, expect fish to be active and selective.
What's Working — Hot Flies

Parachute - Blue Wing Olive #22
#22

Juju Baetis Tungsten #22
#22
Barr's Flashback Emerger - BWO #22
#22

Olsen's Quilldigon - Olive - Barbless #22 - 24
#22-24

Black Zebra Midge(TBH) #20
#20

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

Egan's GTI Caddis - Olive #12
#12

Olsen's Straggle Stone Brown Barbless #12 - 32
#12

Coffey's CH Sparkle Minnow Sculpin #6
#6

Tungsten Jig Bugger - Olive - Barbless #14
#14

Bionic Ant 2.0 - Black #16
#16

Egan's Frenchie #12
#12
Hatch Chart
| Insect | Size | Activity | Prime Time |
|---|---|---|---|
| Blue-Winged Olive (Baetis) | 20-22 | Heavy | 11 AM - 3 PM |
| Midge | 20-24 | Moderate | 8 AM - 11 AM |
| Caddis | 16-20 | Moderate | 2 PM - 6 PM |
| Stonefly (Nymph) | 6-12 | Light | All Day |
| Terrestrials (Ants) | 12-16 | Light | 12 PM - 4 PM |
Best Time Window
- 7 AM - 10 AM: Midge activity in slow tailouts and eddies; nymph the deeper runs with stonefly and caddis patterns before the sun fully hits the water.
- 11 AM - 3 PM: Prime BWO hatch window — watch for rising fish in the flats and seams, switch to dry flies and emergers as the hatch builds.
- 5 PM - 7 PM: Streamer hour along the deep banks and undercut edges as light fades; caddis adults also active in the riffles during this window.
Guide's Tip
From the benchWith low, clear water and a bluebird day ahead, your approach matters as much as your fly selection. Stay low, wade slowly, and work upstream so you're not lining fish in these gin-clear conditions. During the BWO hatch window (roughly 11 AM to 3 PM), position yourself at the tail of a flat and let fish reveal themselves before you cast — target individual risers with a 12-foot leader and 6X tippet. For streamers, focus on the first and last 90 minutes of light, swinging or stripping along the deep, cut banks where big browns are staging for the fall.
Main Species
Brown Trout
Rainbow Trout
Mountain Whitefish
