Green River Fly Fishing Report - September 13, 2026

Fly Fishing Report

GREEN RIVER

Report
SEP 13 — 20, 2026
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Flow
2180CFS
GREEN RIVER NEAR GREENDALE, UT
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Water Temp
58.8°F
Updated 2026-09-12
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Weather
50–81°F
Mostly Clear
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Clarity
Clear
Check post-storm
Flow is running at 2,180 CFS with a gauge height of 9.65 ft — slightly off last week's peak but still on the higher end of normal for September — and water temperature is a trout-friendly 58.8°F with excellent clarity. Expect active feeding throughout the day with terrestrials drawing topwater looks and nymphs producing steadily in the seams.
Hatch Chart
Insect Size Activity Prime Time
Blue-Winged Olive (Baetis) 22-24 Moderate 10 AM - 1 PM
Midge 20-24 Moderate 7 AM - 10 AM
Caddis 18-20 Light 5 PM - 7 PM
Terrestrials (Ants, Beetles, Hoppers) 12-16 Heavy 11 AM - 4 PM
Trico 22-24 Light 9 AM - 11 AM
Best Time Window
  • 7 AM - 10 AM: Early midge and Trico window — fish the slow tailouts and pools with small nymphs and midge dries before the wind picks up.
  • 10 AM - 2 PM: Prime terrestrial and BWO time — work the banks with ants and hoppers, then switch to a Parachute BWO when you see risers in the flats.
  • 5 PM - 7 PM: Evening caddis activity in the riffles — skitter a CDC Caddis through the broken water and watch for aggressive surface takes as the light fades.
Guide's Tip
From the benchWith S winds gusting to 35 mph this afternoon, position yourself so the wind is at your back and cast across to the far bank — terrestrials will be piling up on the lee side of any vegetation or structure. If the afternoon storm cell fires up around 3-5 PM, don't pack up; the 30 minutes before the rain often triggers the best dry-fly action of the day as fish get opportunistic. Once the storm passes, drop back to nymphs in the deeper runs — the slight turbidity from any runoff will push fish off the banks and into the main current lanes where a Frenchie or Zebra Midge on the bottom will clean up. Keep your leader long (12-14 ft) and tippet fine (6X) in this clear 58°F water.
Main Species
Rainbow Trout
Brown Trout
Colorado River Cutthroat Trout
Report generated September 13, 2026 — Next update: September 20, 2026