Blackfoot River Fly Fishing Report - June 21, 2026

Fly Fishing Report

BLACKFOOT RIVER

Report
JUN 21 — 28, 2026
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Flow
2460CFS
Blackfoot River near Bonner MT
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Water Temp
59.5°F
Updated 2026-06-21
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Weather
48–80°F
Mostly Clear
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Clarity
Clear
Check post-storm
Flow is 2,460 cfs and dropping with improving clarity — prime timing for the salmonfly and golden stone hatch moving upriver. Water temperature is 59.5°F, right in the sweet spot for aggressive surface and streamer feeding.
Best Time Window
  • 7 AM - 10 AM: Pre-hatch nymphing with stonefly patterns along deep bank structure before the sun hits the water.
  • 10 AM - 4 PM: Prime salmonfly and golden stone dry fly window — work big dries tight to the banks in full sun with the hatch in full swing.
  • 6 PM - 8 PM: Evening caddis and PMD rise in the slower glides and flats — switch to smaller CDC patterns as light fades and fish move into feeding lanes.
Guide's Tip
From the benchWith flows at 2,460 cfs and dropping, the salmonfly hatch is your primary focus — concentrate your efforts on the lower to mid sections of the river where the hatch is most concentrated right now. Work the willow-lined cutbanks and boulder gardens with your big dry, casting tight to structure and giving the fly a full drag-free drift before picking up. If you're not getting looks on top by mid-morning, drop a Pat's Rubber Legs nymph 18–24 inches deep along the same bank structure — fish that won't commit to the surface are still actively feeding subsurface on migrating stonefly nymphs. As the afternoon heats up toward 80°F, shift your streamer game to the deeper shaded runs and swing a Sparkle Minnow through the tailouts — the warming temps and high protein availability have big fish in a predatory mood.
Main Species
Westslope Cutthroat Trout
Brown Trout
Rainbow Trout
Fly Fish Food
Report generated June 21, 2026 — Next update: June 28, 2026