Mountain Freestone · Mixed · US, US

South Fork Trinity River

South Fork Trinity River
Today · About as good as it gets
Pheasant Tail Nymph
Forecast · Today
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
Pheasant Tail Nymph
Pheasant Tail Nymph
Conditions on the water · Today
Live gauge
Level
Steady
0.79 m
Water temp13.5°C
ClarityClear
Weather18°C
WindN 5 km/h
Pressure1021 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
Ideal
14°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
Excellent — water temperature is working for you, but time of day is the limiting factor today.
Likely species
Mayflies
Chironomids
Gammarids
Hatch timeline · todayPeak at 21 Uhr

12 Uhr(now) — Mahogany Dun

Stage: On emergersApproach: Emerger or dryActivity: 63%
Peak emergence window5 food groups active

Peak activity at 21 Uhr — Brown Dun (Brown Dun, 5 food groups active)

Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

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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
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
Fly box · Brown Trout
SD
Sex Dungeon
2-6 · Pattern
Proven pattern for this period
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Van Duzen River
39 km
Steelhead · Chinook salmon · Coho salmon
Mad River
54 km
Steelhead · Chinook salmon · Coho salmon
Eel River system
56 km
Steelhead · Chinook salmon · Coho salmon
Trinity River
57 km
Steelhead · Chinook salmon · Coho salmon
Scott River
120 km
81
Rainbow trout · Brown trout
Gallery · 2
  1. South Fork Trinity River
  2. Terrain map of the venue
    Terrain map
The full read · show the working · for Brown Trout · confidence 75%
How the 82 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity68 × 12%8.2
Conditions total= 82
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Related guides
Euro Nymphingsubsurface methods
Booking & contacts