Freestone · Granite · Catalonia / Occitanie (Val d'Aran)

Garona / Garonne (headwaters)

Garona / Garonne (headwaters) — File:ES5130034-Rio Garona-Arties 2.jpg

The Garona is the Garonne's headwaters — a river rising in high granite peaks and flowing west through the UNESCO Biosphere Reserve of the Val d'Aran.

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
  • LevelProxyvia Noguera Pallaresa
  • Water temp18.4°C
  • ClarityColouredClearing
Today's fly
Perdigón
Perdigón14-18
High-confidence seasonal pick
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Noguera Pallaresa
Water temp18.4°C
ClarityColoured
Weather20°C
WindSW 3 km/h
Pressure1021 hPa
Rain · recent0.0 mm
Rain · ahead9.2 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
18°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Through the Aran valley trout season. Spring olives once snowmelt drops; sedges through summer; small dark flies into autumn close.
Where
Pool tails and the seams behind boulders through the Aran valley. Spanish Garona / Garonne headwaters — clear cold Pyrenean water.
Method
Upstream dry to risers; dry-dropper through the riffles. Aran valley water reads clear — long leader, fine tippet, careful approach.
Kit
9 ft #4 — French freestone default. Floating line, 12 ft leader to 4 to 5 lb fluoro. Studded boots.
Why this works
Water at 18.4°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 6am

Hatch predictions

Today's headline hatch shown — see all 3 active hatches hour by hour with Pro.

Start free trial

14-day free trial. Cancel anytime.

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

Hatch predictions

Top prey shown — see all 2 with Pro.

Start free trial

14-day free trial. Cancel anytime.

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
Large Dark OliveHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Autumn OliveHatch
1
2
1
GrannomHatch
1
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.
  • Border-water and named-section rules matter here
  • Check the exact Aragón or Catalonia licence requirement, plus any coto or ZPC permit and special seasonal rules for the precise stretch you plan to fish.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 2
Water here around 18°C — probably warm enough to stress Brown Trout . These are likely cooler.
Noguera de Tor
21 km
~14°C
Brown trout
Cinca
47 km
~17°C
Brown trout
Gallery · 2
  1. Garona / Garonne (headwaters) — File:ES5130034-Rio Garona-Arties 2.jpg
    File:ES5130034-Rio Garona-Arties 2.jpg
  2. Terrain map of the venue
    Terrain map
About this water

The Garona is the Garonne's headwaters — a river rising in high granite peaks and flowing west through the UNESCO Biosphere Reserve of the Val d'Aran. Alpine meadows and dramatic mountain habitat frame clear, cold freestone water holding strong wild brown trout. Technically Spanish territory but culturally and geographically overlapped with France. Spanish and French licences required for respective sections.

  • Granite
Water quality (WFD)
  • Ecology: High
  • Chemical: Unknown
What this classification means

WFD ecological status Good → High corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody ES091MSPF784 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · ES091MSPF784

The full read · show the working · for Brown Trout · confidence 80%
How the 38 is built — score × weight = contribution
Temperature49 × 28%13.7
Flow80 × 22%17.6
Clarity40 × 18%7.2
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity60 × 12%7.2
Conditions total= 62
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Noguera Pallaresaproxy
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.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout check named border section or controlled zone → check named border section or controlled zone
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts