Freestone · Limestone · Catalonia

Upper Segre

Upper Segre terrain map
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.

Poor · Brown Trout
Klinkhammer · 14-18
Poorlive now
Not the day for it
River temperature is the limiting factor today, not the flow. This is not the day to push it. Check the thermal advice above before you head out.
90% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp22.4°C
  • ClarityClear
Today’s fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp22.4°C
ClarityClear
Weather30°C
WindSW 15 km/h
Pressure1018 hPa
Rain · recent0.0 mm
Rain · ahead3.0 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for brown trout
Warm — slow
22°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 22.4°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayQuiet day

Hatch predictions

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Sub-surface · on the nymphunder the surface

Hatch predictions

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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
Records-basedModerate confidence

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

Through the year
0–3 scale · July 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
Cooler water nearby · 1
Probably above the brown trout safety line — these are likely cooler, but carry a thermometer.
Noguera de Cardós
19 km
~17°C
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 8 is built — score × weight = contribution
Temperature4 × 28%1.1
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity61 × 12%7.3
Limiting factor: Water temperature (22.4°C) is outside Brown Trout's preferred range (10–16°C)= 55
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Troutdepends on Catalan zone class → depends on Catalan zone class
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts