Madison River Fly Fishing Report - June 21, 2026

Fly Fishing Report

MADISON RIVER

Report
JUN 21 — 28, 2026
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Flow
707CFS
Madison River bl Hebgen Lake nr Grayling MT
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Water Temp
55.8°F
Updated 2026-06-20
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Weather
40–69°F
Chance Rain Showers
💧
Clarity
Clear
Check post-storm
The Madison below Hebgen Lake is running a steady 707 CFS at 55.8°F — dam-regulated flows keep things consistent and fishable, with excellent clarity expected heading into a sunny Sunday.
Hatch Chart
Insect Size Activity Prime Time
Salmonfly 4-6 Light 11 AM - 3 PM
Golden Stonefly 6-8 Moderate 10 AM - 4 PM
PMD (Pale Morning Dun) 16-20 Moderate 10 AM - 1 PM
Caddis 16-18 Moderate 6 PM - 8 PM
Blue-Winged Olive 20-22 Light 8 AM - 11 AM
Midge 20-22 Light 7 AM - 9 AM
Best Time Window
  • 7 AM - 10 AM: Early nymphing with stonefly and PMD patterns in the main channel seams before the sun hits the water.
  • 10 AM - 2 PM: Prime dry fly window as PMDs hatch and salmonfly adults appear along the banks — work the edges with large dries.
  • 6 PM - Dark: Evening caddis activity picks up in the flats and slower runs; skitter a CDC caddis through rising fish before last light.
Guide's Tip
From the benchWith the salmonfly hatch just beginning to fire and golden stones already active, focus your morning on nymphing the deep seams along the far bank with a heavy stonefly pattern, getting your rig to the bottom quickly in 3-5 feet of water. As the day warms toward noon, start scanning the banks for rising fish and switch to a dry — look for the biggest splashiest rises near overhanging willows where salmonfly adults are landing. The afternoon window before any storm cells build is prime time to walk the banks with a hopper or large dry, covering water quickly. If thunderstorms push through after 2 PM, drop back to a nymph rig and work the slower tailouts where fish stack up when surface activity shuts down.
Main Species
Brown Trout
Rainbow Trout
Mountain Whitefish
Fly Fish Food
Report generated June 21, 2026 — Next update: June 28, 2026