Freestone · Limestone · Catalonia

Upper Segre

Upper Segre terrain map

The upper Segre above La Seu d'Urgell is a limestone river rising in high Pyrenees near Andorra and flowing southeast through mountain valleys and gorges.

Prime · Brown Trout
Perdigón · 14-18
Primelive now
About as good as it gets
River dropping into shape after a lift. The kind of afternoon you remember — a weighted nymph through the clearing seams, the dry as it settles.
90% confidence
What moved it
  • LevelProxyvia Noguera Pallaresa
  • Water temp16.6°C
  • ClarityClear
Today's fly
Perdigón
Perdigón14-18
High-confidence seasonal pick
Conditions on the water
Proxy gauge
Level
Falling
Proxy
via Noguera Pallaresa
Water temp16.6°C
ClarityClear
Weather20°C
WindNE 4 km/h
Pressure1024 hPa
Rain · recent0.0 mm
Rain · ahead9.4 mm

No gauge on this water — conditions are inferred from Noguera Pallaresa. The trend transfers, the absolute level does not.

Water temperature for Brown Trout
Warm — slow
17°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 — river flow is right today, though time of day could be better.
Hatch timeline · todayPeak at 6am

Hatch predictions

Today's headline hatch shown — see all 8 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
  • Controlled trout waters may require a ZPC permit, and legal dates differ between low-mountain, high-mountain, with-kill, and no-kill sectors, so check the current Generalitat rules for the exact zone.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Río Segre
5.0 km
Brown trout
Catalan Pyrenees controlled zones
7.0 km
Brown trout
Noguera de Cardós
19 km
80
Brown trout
Segre (Cerdagne)
29 km
Brown trout · Grayling
Ariège (Luzenac reach)
29 km
Brown trout
About this water

The upper Segre above La Seu d'Urgell is a limestone river rising in high Pyrenees near Andorra and flowing southeast through mountain valleys and gorges. Clear, alkaline freestone holds excellent wild brown trout with high biodiversity. Technical runs alternate with pocket water and pools throughout. The Segre's upper reaches — Organyà, Montferrer, La Seu d'Urgell zones — are the true trout destination. Good dry-fly and nymphing opportunities throughout.

  • Limestone
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown

WFD classification · ES091MSPF621

The full read · show the working · for Brown Trout · confidence 90%
How the 84 is built — score × weight = contribution
Temperature86 × 28%24.1
Flow95 × 22%20.9
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity68 × 12%8.2
Conditions total= 84
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Noguera Pallaresaproxy
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout depends on Catalan zone class → depends on Catalan zone class
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts