Freestone · Limestone · Navarra

Río Erro

Río Erro venue image
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A pristine Arga tributary in the eastern Pyrenean sector of Navarra, flowing through a compact limestone catchment with high elevation and steep gradients.

Species

Slow going — pick your moments

River lifting fast on the rain. Take your time — read the water before you cast.

40% confidence — limited data
Water temperature for brown trout
Cool — slow
6°C est.ideal 10–16°C
0°14°28°
Why this score · for brown trout
  • Temperature3428% weight
  • Flow5522% weight
  • Clarity1518% weight
  • Feeding Time5013% weight
  • Pressure807% weight
  • Prey Activity1312% weight
Conditions
Level
0.59 m
Water temp
5.9°C
Estimated
Clarity
Very coloured
Colouring up
Air temp
3°C
Wind
NE 9 km/h
Light breeze
Pressure
1019 hPa
Rain · 48h
2.1 mm
Light rain
Rain · ahead
4.6 mm
Light rain · next 48h

Live readings — water temperature is an estimate where the gauge does not record it.

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
Poor conditions. Pressure is favourable (80), Prey activity is weakest (13).
Through the year
0–3 scale · May 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.

Gallery · 1
  1. Terrain map of the venue
    Terrain map
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.
Directions
Apple MapsGoogle Maps
About this water

A pristine Arga tributary in the eastern Pyrenean sector of Navarra, flowing through a compact limestone catchment with high elevation and steep gradients. Clear, cold alpine freestone with pocket water and short pools holding small to medium wild browns. Technical nymphing and dry fly essential — delicate presentation and careful wading. Limestone geology means rapid snowmelt rise and a fast return to base flow.

  • Limestone
Seasons & zones
  • Trout1 May → 30 June
Other water nearby · 5
Booking & contacts