Last Chance to Ashton, Idaho

Henry's Fork Hatch Report

Updated Apr 24, 2026, 8:03 AM MDT

Keep the first part of the day tight and technical with midges and baetis, then look for better afternoon surface feeding if the light stays soft.

Current Conditions
  • Flow: Tailwater influence keeps some reaches stable, but different sections of the Fork fish very differently on the same day.
  • Water Temperature: Spring temperatures usually build slow, which puts the most consistent feeding window from late morning into the afternoon.
  • Weather: Flat light and cloud cover make the best BWO days. Bright sun narrows the surface window.
  • Overall Rating: 7/10
Today's Read

Henry's Fork is keyed to the bugs that are active in the current light and water conditions. These are the insects that matter right now and the windows when they matter most.

Current Hatch Report
  • Blue-winged olives, size 18-20, midday through afternoon
  • Midges, size 20-24, morning and calm periods
  • Caddis prep and pupa activity, size 14-16, late afternoon in lower reaches
Flies To Match The Hatch
  • CDC BWO Emerger, size 18-20, emerger
  • RS2 gray, size 20-22, emerger
  • Zebra Midge, size 20-22, nymph
  • Pheasant Tail thin, size 18-20, nymph
  • BWO Sparkle Dun, size 18-20, dry
How Fish Respond To This Hatch
  • Henry's Fork trout feed in classic technical-water fashion this time of year: steady but selective when the bugs are there, cautious when they are not. Fish hold in slow seams, springy edges, and shallow flats where emergers drift naturally. If you rush the presentation or land too close, you will put them down fast, especially in the Railroad Ranch-style water.
  • Match the section to the day. Lower, more technical water rewards stealth; faster ranch and canyon water can tolerate a little more movement.