Freestone · Limestone · Navarra, ES

Río Areta

Río Areta venue image

A compact limestone Arga tributary in easternmost Navarra's trout zone.

Poor · Brown Trout
Klinkhammer · 14-18
Closed season
Out of season. Plenty of other water available now.
Closed — confidence not applicable today.
What moved it
  • LevelProxyvia Río Irati
  • Water temp17.6°C
  • ClarityVery colouredColouring up
Today's fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Río Irati
Water temp17.6°C
ClarityVery coloured
Weather20°C
WindNE 7 km/h
Pressure1018 hPa
Rain · recent0.7 mm
Rain · ahead9.0 mm

No gauge on this water — conditions are inferred from Río Irati. 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
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.
Hatch timeline · todayPeak at 6am

Hatch predictions

Today's headline hatch shown — see all 5 active hatches hour by hour 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
Trout seasonSeason
1
1
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.
  • Gobierno de Navarra fishing licence required
  • Check the exact tramo and any daily-permit or coto-pass requirement for the named stretch before travel.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Río Irati
8.0 km
0
Brown trout
Río Salazar
14 km
0
Brown trout
Río Aragón
15 km
0
Brown trout
Río Erro
23 km
0
Brown trout
Río Urrobi
15 km
Brown trout
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

A compact limestone Arga tributary in easternmost Navarra's trout zone. The Areta drains from karst plateaux and flows through narrow alpine valleys with significant drop. Clear, alkaline freestone with pocket-water runs and short pools holding wild browns with good size distribution. Technical short-line nymphing and dry fly. Rapid limestone spate response moderated by karst storage. Access from Aoiz or Orbaieta.

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

WFD classification · ES091MSPF537

The full read · show the working · for Brown Trout · confidence 55%
How the 0 is built — score × weight = contribution
Temperature64 × 28%17.9
Flow80 × 22%17.6
Clarity15 × 18%2.7
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity51 × 12%6.1
Limiting factor: Water is very coloured — too coloured for Brown Trout= 58
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Río Iratiproxy
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.
A drop and clear would lift the flow and clarity scores.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 May → 30 June

    RSS Irati–Erro basin (2,728 permits in 2026). All catch-and-release. Extendable to 15 Jul by resolution. Daily basin permit required.

Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts