Freestone · Limestone · Navarra

Río Areta

Río Areta terrain map
Terrain map

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
  • LevelDry recentlyNo gauge reading
  • Water temp19.9°C
  • ClarityClear
Today’s fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp19.9°C
ClarityClear
Weather22°C
WindE 5 km/h
Pressure1016 hPa
Rain · recent0.0 mm
Rain · ahead1.2 mm

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

Water temperature for brown trout
Warm — slow
20°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 · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 2 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read 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
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
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.
  • Se requiere licencia de pesca del Gobierno de Navarra
  • Comprueba el tramo exacto y cualquier requisito de permiso diario o pase de coto para el tramo indicado antes de viajar.
What's coming
Plan ahead
5-day outlook
Water here around 20°C. Nothing cooler within range — carry a thermometer.
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 80%
How the 0 is built — score × weight = contribution
Temperature26 × 28%7.3
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity54 × 12%6.5
Conditions total= 59
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
  • Trout1 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
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