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.

Tomorrow · About as good as it gets
Sculpin Streamer
Forecast · Tomorrow
About as good as it gets
On the feed top to bottom — start on the rises with a dry, drop a nymph if they stay down.
90% projected
Today's fly
Sculpin Streamer
Sculpin Streamer
Conditions on the water · Tomorrow
Live gauge
Level
Steady
0.64 m
Water temp9.5°C
ClarityClear
Weather12°C
WindN 12 km/h
Pressure1014 hPa
Rain · recent1.2 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
10°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 water temperature could be better.
Likely species
Mayflies
Caddisflies
Hatch timeline · tomorrowPeak at 11am

12pm(now) — Western Blue-Winged Olive

Stage: On emergersApproach: Emerger or dryActivity: 81%
Also:Black Midge63%
Peak emergence window5 food groups active

Peak activity at 11am — Western Blue-Winged Olive (Western Blue-Winged Olive, Peak emergence window)

Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read with Pro.

Start free trial

14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

See what else is on the menu with Pro.

Start free trial

14-day free trial. Cancel anytime.

Evidence
Records-basedModerate confidence

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

Through the year
0–3 scale · September 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 70 is built — score × weight = contribution
Temperature51 × 28%14.3
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity54 × 12%6.5
Conditions total= 70
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.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 April → 31 March
Related guides
Euro Nymphingsubsurface methods
Booking & contacts