Green River below Flaming Gorge
Green River · Utah · USGS gage 09234500
Tailwater below Flaming Gorge Dam (Greendale). Cold, clear, tailwater bug life.
Water
55°F
Flow
1,100 cfs
Air
78°F
Sky
0%
Predicted hatches · 2026-06-15
ReportedMidgeChironomidae0.45
1 report say it's happening, though conditions are lukewarm. water 12.5°C (55°F) is cooling past the prime band (1-10°C); shoulder of the season; 8 days sustained ≥0°C; watch midday, especially cold months.
reports: Fly Fish Food — Green River Report
flies: Zebra Midge #18-22, Griffith's Gnat, Disco Midge
ReportedPale Morning DunEphemerella spp.0.44
1 report say it's happening, though conditions are lukewarm. water 12.5°C (55°F) is warming toward the prime band (13-18°C); shoulder of the season; 3 days sustained ≥12°C; watch late morning to early afternoon.
reports: Fly Fish Food — Green River Report
flies: PMD Comparadun #16-18, Sparkle Dun, Pheasant Tail #16
PredictedGreen DrakeDrunella spp.1.00
Predicted by conditions; no reports yet. water 12.5°C (55°F) sits in the prime band (11-15°C); peak season; 4 days sustained ≥10°C; watch midday, often cloudy.
flies: Green Drake Parachute #10-12, Cripple, Hares Ear #10
PredictedSalmonflyPteronarcys californica0.45
Predicted by conditions; no reports yet. water 12.5°C (55°F) is warming toward the prime band (13-16°C); peak season; 3 days sustained ≥12°C (wants 4); watch late morning through evening.
flies: Rogue Foam Salmonfly #4-6, Chubby Chernobyl, Pat's Rubber Legs
PredictedEastern Green DrakeEphemera guttulata0.25
water 12.5°C (55°F) is warming toward the prime band (14-18°C); peak season; 3 days sustained ≥12°C; watch evening; the spinner (Coffin Fly) falls at dusk.
flies: Green Drake #8-10, Coffin Fly Spinner, Drake Emerger
PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.