Green River Fly Fishing Report - May 5/10/2026
GREEN RIVER (UTAH) FLY FISHING REPORT
High Water Alert — Drift Boats Only; Nymphs & Midges Ruling the Tailwater
Report Date: May 10, 2026 | Next Update: May 17, 2026
Current River Conditions
⚠️ HIGH WATER ADVISORY: Bureau of Reclamation environmental flows for Razorback Sucker larvae pushed releases to approximately 8,600 CFS starting May 4th and are projected to remain elevated through May 15th. Wading is extremely dangerous — drift boat or guided float trips are the only safe way to fish the river right now. Bank anglers should stay well back from the water's edge and fish only from stable, high ground.
Flow & Clarity
~8,600 CFS (environmental release, Flaming Gorge Dam) — Real-time gauge data unavailable. Clarity is reduced but fishable in the upper A-Section seams and eddies; expect off-color, turbid conditions in the main channel. Check GRZU1 at the Colorado Basin River Forecast Center for hourly updates before launching.
~8,600 CFS (environmental release, Flaming Gorge Dam) — Real-time gauge data unavailable. Clarity is reduced but fishable in the upper A-Section seams and eddies; expect off-color, turbid conditions in the main channel. Check GRZU1 at the Colorado Basin River Forecast Center for hourly updates before launching.
Water Temperature
Real-time gauge data unavailable. Historically, tailwater temps below Flaming Gorge Dam in May run 44–50°F. High-volume releases from depth will keep water on the colder end of that range — expect sluggish morning activity with fish becoming more active mid-day as surface temps tick up.
Real-time gauge data unavailable. Historically, tailwater temps below Flaming Gorge Dam in May run 44–50°F. High-volume releases from depth will keep water on the colder end of that range — expect sluggish morning activity with fish becoming more active mid-day as surface temps tick up.
Weather
Weather data unavailable for this report. Typical early-May conditions in Dutch John, UT bring daytime highs in the upper 50s–low 60s°F with afternoon cloud build. Check NOAA forecast for Daggett County before your trip — overcast skies will improve BWO and midge activity significantly.
Weather data unavailable for this report. Typical early-May conditions in Dutch John, UT bring daytime highs in the upper 50s–low 60s°F with afternoon cloud build. Check NOAA forecast for Daggett County before your trip — overcast skies will improve BWO and midge activity significantly.
Access & Regs
✅ Open year-round below Flaming Gorge Dam. Artificial flies & lures only. Single barbless hook — no tandem/dropper/multi-fly rigs. Trout limit: 2 under 15″ and 1 over 22″ (fish 15–22″ must be immediately released). No motorized boats between the UT-CO state line and the dam. Wading is NOT recommended at current flows — float trips only.
✅ Open year-round below Flaming Gorge Dam. Artificial flies & lures only. Single barbless hook — no tandem/dropper/multi-fly rigs. Trout limit: 2 under 15″ and 1 over 22″ (fish 15–22″ must be immediately released). No motorized boats between the UT-CO state line and the dam. Wading is NOT recommended at current flows — float trips only.
Hatch Chart
| Insect | Size | Activity | Prime Time |
|---|---|---|---|
| Midges (Chironomidae) | #20–26 | 🟢 Heavy — all day | 9 AM – 3 PM; back eddies all day |
| Blue-Winged Olive (Baetis) | #18–22 | 🟢 Active — building | 11 AM – 2 PM; best on overcast days |
| Caddis (Brachycentrus) | #16–18 | 🟡 Emerging — early season | Afternoon, especially in slower water |
| Sowbugs / Scuds | #14–18 | 🟢 Consistent sub-surface | All day — high-water staple |
| Flying Ants | #16–18 | 🟡 Sporadic — beginning to appear | Midday warm spells |
Recommended Flies
- Juju Baetis Tungsten #22 — The go-to BWO nymph on the Green; dead-drift tight to the bottom in seams and soft edges during the 11 AM–2 PM Baetis window.
- Black Zebra Midge (TBH) #20 — Midge patterns are the backbone of Green River fishing at high water; fish this in back eddies and foam lines all day long.
- Lil Bit Craven - Dark Olive #22 — A local favorite on the Green; deadly in the film during midge and BWO hatches, especially on overcast afternoons.
- Tungsten Tailwater Sowbug - Rainbow #10 — Sowbugs are dislodged in massive numbers at high flows; get this down deep in the drift and hold on.
- Olsen's Hare's Ear Blowtorch Barbless #20 — Excellent general attractor nymph that covers both Baetis and midge feeding lanes; already barbless, regulation-ready.
- Egan's Silver Bullet - Baetis #14 — A high-visibility, fast-sinking Baetis imitation that cuts through the current column quickly — critical at 8,600 CFS to get flies into the strike zone.
- Parachute - Blue Wing Olive #22 — When BWOs are popping and fish are sipping in the calmer eddies, this dry is your best shot at a surface eat.
- Barr's Flashback Emerger - BWO #22 — Fish this in the film just below the surface during the Baetis hatch; trout key on emergers before committing to dries at high water.
- Corn-fed Caddis (CDC) Tan #20 — Early-season caddis are beginning to show; this CDC pattern sits beautifully in the film and is a great searching dry in slower water.
- Coffey's CH Sparkle Minnow Sculpin #6 — High water pushes baitfish and sculpin out of cover; swing or strip this streamer along undercut banks and below Red Creek for aggressive Browns.
- Tungsten Rainbow Warrior - Extra Heavy #14 — The extra-heavy tungsten bead is essential right now to punch through the heavy current and reach fish holding on the bottom.
- Roza's World Spain Perdigon Barbless #18 — Perdigons are tailor-made for high, fast water — the slick body cuts current and sinks fast; already barbless and regulation-compliant.
Tactics & Tips
Safety First — Float or Stay Home: At ~8,600 CFS, wading the Green River below Flaming Gorge is life-threatening. This is drift boat water only. If you don't have a boat and an experienced oarsman, wait until flows drop back toward 1,000–2,000 CFS after May 15th. That said, experienced guides are still putting clients on fish from the boat.
Nymphing from the Boat: High-stick nymphing from a drifting boat is the primary technique right now. Use a single heavy nymph (regulations prohibit tandem/dropper rigs) — reach for the Tungsten Rainbow Warrior Extra Heavy, Tungsten Tailwater Sowbug, or a Perdigon to get down fast. Use a longer leader (12–14 ft) with 4X–5X fluorocarbon tippet and a large, high-visibility indicator set deep. Target the soft water: seams along the main current, eddies behind boulders, and the inside bends where fish stack up to escape the push.
Streamer Fishing: High water is prime time for big Browns on streamers. Swing or strip the Coffey's Sparkle Minnow Sculpin along undercut banks, especially below Red Creek confluence where the water color changes. Use a sink-tip line or heavy leader to keep the fly in the zone. One fly only per regulations — no stacked rigs.
Dry Fly Windows: Don't abandon the dry fly entirely. From 11 AM to 2 PM, watch for BWO and midge activity in back eddies and foam lines. When you see noses, switch to the Parachute BWO #22 or Barr's Flashback Emerger and target individual risers with precise, drag-free drifts. Overcast days dramatically improve surface activity.
Regulations Reminder: This is an artificial flies and lures only stretch. All hooks must be barbless and you are limited to a single hook — no dropper rigs, no tandem setups. Trout between 15–22 inches must be immediately released. Handle fish quickly, keep them in the water, and use a rubber net to protect the fishery. Flows are scheduled to drop after May 15th — conditions will improve dramatically for wading anglers later this month.
