Green River below Flaming Gorge
Green River · Utah · USGS gage 09234500
Tailwater below Flaming Gorge Dam (Greendale). Cold, clear, tailwater bug life.
Water
60°F
Flow
2,850 cfs
Air
68°F
Sky
100%
Pressure
29.48 in
Wind
30 mph
Predicted hatches · 2026-09-14
ConfirmedSpotted / Summer CaddisHydropsyche spp.0.66
Model says likely and 1 recent report confirm it. water 15.3°C (60°F) sits in the prime band (14-19°C); shoulder of the season; 8 days sustained ≥12°C; low pressure — fish looking up; watch evening, last hour of light.
reports: Fly Fish Food — Green River Report
flies: Elk Hair Caddis #14-16, Iris Caddis, X-Caddis
ReportedHopper / TerrestrialsAcrididae (grasshoppers)0.47
1 report say it's happening, though conditions are lukewarm. water 15.3°C (60°F) is warming toward the prime band (17-24°C); shoulder of the season; 7 days sustained ≥14°C; low pressure — fish looking up; wind puts terrestrials in play; watch warm, breezy afternoons.
reports: Fly Fish Food — Green River Report
flies: Morrish Hopper #8-12, Chubby Chernobyl, Dave's Hopper
PredictedSlate Drake / IsonychiaIsonychia spp.0.71
Predicted by conditions; no reports yet. water 15.3°C (60°F) is warming toward the prime band (16-21°C); peak season; 7 days sustained ≥14°C; low pressure — fish looking up; watch afternoon/evening; nymphs crawl to shore to emerge.
flies: Isonychia #10-12, Slate Drake, Leadwing Coachman
PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.