Freestone · Mixed · Wyoming, US

Green River

A wide, calm stretch of the Green River bordered by grassy banks under a dramatic stormy sky in Wyoming.

The upper Green above Warren Bridge is high, open, sagebrush-flat freestone water with the Wind River Range standing off to the east, and it's a long way from the famous tailwater Green down in Utah.

Good · Brown Trout
Parachute Adams · 16-20
Goodlive now
A proper day on the water
River steady at a fishable height. A proper day for it. Work the seams with an upstream nymph, switch to the dry when they show.
90% confidence
What moved it
  • Level0.61 mLast reading 5h ago
  • Water temp7.6°C
  • ClarityClear
Today's fly
Parachute Adams
Parachute Adams16-20
Proven pattern for this period
Conditions on the water
Live gauge
Level
Steady
0.61 m
Last reading 5h ago
Water temp7.6°C
ClarityClear
Weather1°C
WindNE 3 km/h
Pressure1030 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Brown Trout
Cool — slow
8°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Why this works
Good — water clarity is right today, though time of day could be better.
Likely species
Mayflies
Gammarids
Hatch timeline · todayPeak at 12pm

Hatch predictions

Today's headline hatch shown — see all 7 active hatches hour by hour as a supporter.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Supporters see what else is on the menu.

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Evidence
Records-basedModerate confidence

Based on species-occurrence records, not local invertebrate surveys.

Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
2
2
1
1
2
2
2
2
2
2
2
2
Brown DunHatch
2
3
3
3
3
3
3
2
Western Green DrakeHatch
2
2
Flav (Small Western Green Drake)Hatch
2
3
2
Mahogany DunHatch
2
2

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Brown Trout fly box
SD
Sex Dungeon
2-6 · Pattern
Proven pattern for this period
Permits & access
Permit required — see local rules.
  • Wyoming licence
  • Flies-and-lures-only from Warren Bridge to Wood's Bridge; good BLM wade access — check Wyoming Game & Fish.
What's coming
Plan ahead
5-day outlook
Gallery · 2
  1. A wide, calm stretch of the Green River bordered by grassy banks under a dramatic stormy sky in Wyoming.
    Green River at Seedskadee National Wildlife Refuge Wyoming
  2. Terrain map of the venue
    Terrain map
About this water

The upper Green above Warren Bridge is high, open, sagebrush-flat freestone water with the Wind River Range standing off to the east, and it's a long way from the famous tailwater Green down in Utah. Browns, rainbows, and mountain whitefish hold in the riffles and runs, and there's good BLM wade access through the Warren Bridge stretch where it's flies-and-lures-only. It runs high and off-color in June snowmelt, then settles into wadeable summer flows. Big, quiet country and willing fish — the kind of place you fish slow because there's no reason to hurry.

  • Mixed
Water quality · US Clean Water Act
  • Aquatic life: Supporting
What this classification means

EPA ATTAINS assessment unit 'Green River' (WYGR140401010200_01), 2024 Integrated Report. Aquatic Life use: Fully Supporting. This is a Clean Water Act assessment-unit classification (the US analogue of WFD), not a live reading.

Status is for the Clean Water Act assessment unit covering this reach.

EPA ATTAINS (Clean Water Act) · WYGR140401010200_01

The full read · show the working · for Brown Trout · confidence 90%
How the 72 is built — score × weight = contribution
Temperature59 × 28%16.5
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity66 × 12%7.9
Conditions total= 72
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Warmer water — toward the 10–16 °C ideal band — would lift the temperature score.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 April → 31 March
Related guides
Euro Nymphingsubsurface methods
Booking & contacts