Free Resource · Updated 2026
The Green River below Flaming Gorge Reservoir in Sweetwater County is one of Wyoming's finest tailwaters. Cold dam releases produce excellent brown and rainbow trout populations with year-round fishing opportunities.
Green River Hatch Calendar — Quick Reference
The Green River tailwater below Flaming Gorge Dam spans about 35 miles through Red Canyon and into the flats. The cold consistent water temperatures allow fish to feed year-round and produce large well-conditioned trout. Midges and BWOs carry the fishing through the winter months.
Caddis hatches in June produce great evening surface action. PMD hatches in July are excellent and trico spinner falls in August add another dimension to the summer dry fly fishing. The mahogany dun hatch in September is an underrated fall event that brings fish up selectively.
Access is through Flaming Gorge National Recreation Area on the Utah-Wyoming border. The river is popular but the length of fishable water spreads pressure out. Both wading and floating are common approaches.
See the full Wyoming Fly Hatch Chart for hatch timing across all of Wyoming's top trout streams.
Check Conditions Near Green RiverWhat to Fish
Trichoptera
Caddis hatches in June produce the best evening dry fly action on the Green River tailwater. Fish the flats and slower runs with an Elk Hair or X-Caddis as the light fades.
Recommended: Elk Hair Caddis #14-16
Ephemerella infrequens
PMD hatches in July draw selective surface feeding from the tailwater browns. Match the hatch precisely with a parachute or CDC emerger and use 5x or 6x tippet.
Recommended: PMD Parachute #16-18
Baetis spp.
BWOs hatch reliably on overcast days in spring and fall. October can be outstanding on the Green River when cool weather and low light conditions trigger heavy hatches.
Recommended: BWO Parachute #18-22
Paraleptophlebia spp.
The mahogany dun hatch in September is one of the best fall events on the Green River. These larger duns draw selective feeding and extend quality dry fly fishing into autumn.
Recommended: Mahogany Dun Parachute #16
Common Questions
The Green River tailwater is below Flaming Gorge Dam in Sweetwater County, Wyoming, near the Utah border. The town of Green River is downstream from the best fishing sections.
Yes. Cold tailwater releases maintain consistent temperatures and the river fishes year-round. Midges and BWOs carry the winter fishing.
Yes, wade fishing is common in the upper section near the dam. Floating in a drift boat or raft is popular for covering the longer stretches of the tailwater.
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