Freestone · Mixed · Vall Fosca, Pallars Jussà, Catalonia

Río Flamisell

Río Flamisell terrain map
Marginal · Brown Trout
Perdigón · 14-18
Marginallive now
Slow going — pick your moments
River temperature is the limiting factor today, not the flow. Fish dawn or dusk if you go at all, and handle everything with extra care.
80% confidence
What moved it
  • Level0.24 mLast reading 4h ago
  • Water temp18.5°C
  • ClarityClear
Today's fly
Perdigón
Perdigón14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.24 m
Last reading 4h ago
Water temp18.5°C
ClarityClear
Weather20°C
WindSW 5 km/h
Pressure1023 hPa
Rain · recent0.0 mm
Rain · ahead19.3 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
Warm — slow
19°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
Water at 18.5°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayPeak at 6pm

Hatch predictions

Today's headline hatch shown — see all 10 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

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Evidence
Survey-backed · regionalHigh confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
1

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

Ranked for today
Brown Trout fly box
Permits & access
Permit required — see local rules.
  • Catalan fishing licence required
  • Many Pallars stretches are no-kill or otherwise specially managed, so check the exact sector and current Generalitat rules before planning.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Water here around 19°C — probably warm enough to stress Brown Trout . These are likely cooler.
Garona / Garonne (headwaters)
35 km
~18°C
Brown trout
The full read · show the working · for Brown Trout · confidence 80%
How the 37 is built — score × weight = contribution
Temperature47 × 28%13.2
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity67 × 12%8.0
Conditions total= 72
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
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