Quick reference
| Field | Value |
|---|---|
| State / region | Utah, northeastern Utah (Flaming Gorge / Uinta Basin) |
| Species | Brown trout, rainbow trout, cutthroat trout |
| Best months | March–May and September–November; fishable year-round |
| Water type | Tailwater |
| Difficulty | Intermediate to advanced — very clear water, long leaders, selective fish |
| Wading | Limited; primarily a drift-boat fishery with select wade spots at moderate flows. Studded boots and a staff for slick rock and strong current |
Why fish here
The Green River below Flaming Gorge Dam is a cold, clear western tailwater running through deep red-rock canyon and high desert before opening into Browns Park at the Utah–Colorado line. Dam regulation keeps flows consistent year-round, and prolific scud, midge, and mayfly production supports dense populations of wild brown and rainbow trout — with cutthroat present in some reaches. The reach is managed as artificial-flies-and-lures-only water, and the fishing that draws anglers from around the world is technical sight-fishing: spotting fish in remarkably clear water and getting a small fly to drift naturally past them.
Trout densities are highest in Section A, the first seven miles below the dam, and taper progressively through Sections B and C. That gradient gives the river three distinct personalities on one piece of water: numbers of quality fish in steep canyon pocket water up top, technical dry-fly water through the middle, and slower, deeper runs downstream that favor nymphs, streamers, and the chance at larger individual fish for anglers willing to cover water.
Because the tailwater is largely insulated from snowmelt runoff, the Green fishes in every season. Heavy blue-winged olive hatches anchor spring and fall, an early-summer cicada event produces some of the river's most famous large-dry-fly fishing, terrestrials carry the summer, and stable winter flows keep midge fishing viable when most freestone rivers are locked up.
The river, section by section
Section A — Flaming Gorge Dam to Little Hole
Access: Flaming Gorge Dam boat ramp (put-in) and Little Hole (take-out), both well-developed and served by paved road from Dutch John. Character: Roughly 7 miles of relatively high-gradient canyon water through Red Canyon — fast riffles, deep runs, and pocket water along sheer sandstone walls, over cobble and bedrock with ample aquatic vegetation. Species mix: Browns and rainbows at the highest densities on the river, feeding on scuds, midges, and mayflies. Crowding: The most heavily fished reach on the Green — heaviest on weekends, holidays, and during prime spring and cicada periods. Notable hatches: Midges in winter and early spring; heavy BWOs in spring; cicadas in early summer; caddis, PMDs, and terrestrials through summer, with evening caddis activity in section reports.
Most anglers fish Section A from a drift boat, putting in at the dam and taking out at Little Hole. Wading access between the two ramps is limited and typically reached by boat, with select spots on gravel bars and eddies at moderate flows. The water is powerful but exceptionally clear, which gives the section a technical tailwater feel despite the strong current — fish see a lot of flies here, and drag-free drifts matter more than pattern choice on many days. Guides concentrate on this reach for numbers of quality trout, and the traffic reflects it; weekdays and shoulder seasons still see regular guide boats but are noticeably quieter than peak summer.
Section B — Little Hole to Indian Crossing (Browns Park)
Access: Little Hole boat ramp at the top; Indian Crossing boat ramp and campground at the bottom, reached by gravel road. Shore access between is limited — rough road spurs or by boat. Character: Moderate gradient as the canyon opens into broader valley — long glides, gentle riffles, wide runs, and slick tailouts. Slightly wider and slower than Section A. Species mix: Browns and rainbows in good numbers, though densities are lower than Section A; fish run more selective in the clearer, slower water. Crowding: Moderate — less than Section A but substantial during main hatch and tourist seasons, mostly drift boats. Notable hatches: Midges, BWOs, caddis, and PMDs, with Yellow Sallies and caddis highlighted in early summer and consistent terrestrial action on sunny days.
Section B is where the Green rewards refinement. The long, slick tailouts and classic run-and-pool structure demand careful presentations and fine tippet, and the slower water produces excellent technical dry-fly fishing during midge and BWO events — this is the reach many anglers pick for sight-fishing to rising fish. Wading is possible in select areas at moderate flows, but the prime banks and mid-river seams are best covered from a boat. On bright summer days, small terrestrials fished tight to the banks are a reliable play.
Section C — Indian Crossing to the Colorado border
Access: Primarily Indian Crossing, plus limited boat ramps and gravel roads through Browns Park. Mixed private land and long distances between access points make this a float reach. Character: The slowest of the three sections — low gradient, broad meanders, long slow runs, softer banks, and deeper pools. Open-valley river rather than canyon. Species mix: Lowest trout densities of the three sections, but the slower, deeper water can favor larger individual fish; the occasional non-trout species shows up in warm-season conditions. Crowding: The lightest pressure on the river — a more remote experience, especially outside peak summer weekends. Notable hatches: Mirrors upstream — midges, BWOs, caddis, Yellow Sallies, terrestrials — with reports noting midday flow changes that can affect hatch rhythm.
Section C trades numbers for space. The structure favors nymphing and streamer work over the tight pocket-water game upstream, and terrestrials and streamers are particularly effective in summer and fall. Wading is possible on some shoals and bars, but the logistics — distance between ramps, private land — favor floating. Anglers who want to work water methodically with a streamer rod and rarely see another boat should start here.
Hatches and seasons
| Months | Hatches | Flies |
|---|---|---|
| Jan–Feb | Midges dominate; fish rise to clusters in soft seams on calm days | Griffith's Gnat #18–22, Zebra Midge #20–24, Black Beauty #20–24, midge pupae in red/black/brown/olive #18–22 |
| Mar–Apr | BWOs and midges — some of the most reliable spring fishing, heavy BWO activity in April | BWO Cripple #18–22, WD-40 olive/gray #16–18, Parachute Adams #16–20, Sparkle Dun #16–20, pheasant-tail nymph #16–18 |
| May–Jun | BWOs continue; caddis and the famous early-summer cicada event; stoneflies and Yellow Sallies in places | Elk Hair Caddis #14–18, foam cicada #8–10, Yellow Sally dries #14–16, attractor parachutes #14–16, scuds #10–12 |
| Jul–Aug | Terrestrials (ants, hoppers, beetles, lingering cicadas) and caddis; PMDs and mixed mayflies on cloudy days | Foam hoppers #8–12, ants black/tan #14–18, Elk Hair Caddis #14–18, PMD dries #16–18, Griffith's Gnat #18–22 |
| Sep–Oct | Smaller BWOs, midges, late caddis; excellent streamer fishing as trout chase big meals | Parachute Adams and BWO dries #18–22, Griffith's Gnat #20–24, zebra midges #20–24, Woolly Bugger #2–6, Sculpzilla-style streamers #4–8 |
| Nov–Dec | Cold-season midges and occasional small BWOs; mostly subsurface | Griffith's Gnat #18–22, midge pupae #18–22, scuds orange/pink/tan #10–12, glo-bugs #10–12, WD-40 #18–20 |
Recommended flies (by season)
| Season | Top patterns | Why |
|---|---|---|
| Spring | BWO dries (Parachute Adams, Sparkle Dun, BWO Cripple #16–20), WD-40 and pheasant-tail nymphs #16–18, Griffith's Gnat and zebra midges #18–22, scuds #10–12, San Juan Worm #10–16 | Heavy BWO and midge hatches with active subsurface feeding; these cover emergers and nymphal drift, while scuds and worms match high-protein tailwater staples fish eat all year, especially at higher flows |
| Summer | Foam cicadas #8–10, hoppers #8–12, ants and beetles #14–18, Elk Hair Caddis #14–18, PMD dries #16–18, Yellow Sally dries #14–16, small attractor nymphs and scuds | Cicadas then a long terrestrial season produce aggressive surface takes; caddis, PMDs, and Sallies give reliable daytime dry-fly options with nymphs producing between hatches |
| Fall | Small BWO and midge dries #18–22, Griffith's Gnat #20–24, Zebra Midge #20–24, Baetis nymphs (Pheasant Tail, WD-40) #18–20, Woolly Buggers and Sculpzilla-type streamers #2–8 | Cooling water pushes trout onto small mayflies and midges while bigger fish chase larger prey; fine-tippet presentations take selective fish in the slicks, streamers pull browns from structure |
| Winter | Griffith's Gnat #18–22, midge pupae (Zebra Midge, Black Beauty) #20–24, scuds #10–12, small Baetis nymphs #18–20, glo-bugs #10–12 | Midges and scuds are the primary winter food sources and trout hold in slow seams near bottom; small subtle nymphs and midge clusters imitate the staples, eggs and scuds cover opportunistic feeding |
Gear notes
A 9-foot 5-weight covers nymphing and general dry-fly work; many anglers add a 3- or 4-weight for delicate dries on Sections B and C, or a 6- or 7-weight for dedicated fall streamer fishing. Long leaders matter in this clarity — 12-foot tapers to 4X–6X (sometimes 7X) for technical dries and nymphs, 3X–4X for heavier rigs like worms and stonefly nymphs. A floating line handles most situations, with an optional sink-tip for streamers. Wade with studded boots and a staff: the rock is slick and the tailwater current is strong even where it looks manageable. Plan for canyon wind and sun — appropriate layers and eye protection.
Logistics
- Regulations: The Green below Flaming Gorge Dam is managed primarily as artificial flies and lures only; bait is prohibited and catch-and-release is strongly encouraged. Confirm current bag and slot limits in the Utah Fishing Guidebook — the Utah Division of Wildlife Resources (UDWR) manages the fishery, and regulations change annually. A valid Utah license is required. Downstream reaches pass through mixed land ownership, so check for local notices and posted boundaries.
- Access points:
- Flaming Gorge Dam Boat Ramp — primary Section A put-in; paved access, parking, heavy drift-boat and guide use. 40.9168, -109.4346
- Little Hole — Section A take-out and Section B put-in; developed area with ramp, parking, and popular shore fishing. 40.9009, -109.3766
- Indian Crossing — key ramp for lower Section B and the start of Section C in Browns Park, reached via gravel road
- Closest fly shop: Spinner Fall Guide Service, Dutch John (also Flaming Gorge Resort and Old Moe Guide Service, Dutch John)
- Nearest towns: Dutch John, Vernal
- Closest gauge: USGS 09234500 — Green River near Greendale, UT
When NOT to fish here
Dam regulation insulates the Green from classic runoff, but very high release periods make wading difficult and push fish tight to the banks — conditions that favor boats over foot anglers. Winter ice and extreme cold reduce surface activity and can make access hazardous, particularly on the lower sections. Peak summer holidays and cicada season bring heavy crowds and boat traffic to Sections A and B; anglers who value solitude should fish weekdays, shoulder seasons, or Section C. Sudden flow changes have been noted in the lower river and can temporarily disrupt feeding and wading plans — monitor release schedules and avoid fishing through major ramp-up periods.
Where to fish next
- Fly Fishing in Utah — the full state guide
- Flaming Gorge Reservoir — the stillwater above the dam, minutes from the Section A put-in
- Strawberry River — another Utah tailwater/freestone system for a change of pace from big-canyon float fishing