Freestone · Mixed · Navarra

Bidasoa tributaries (Navarra side)

Bidasoa tributaries (Navarra side) terrain map
Terrain map

The Bidasoa forms the Franco-Spanish border, draining western Navarra and the Basque side toward the Atlantic.

Species

A side-water session, not the main event

River high but settled. Tributary pocket water is the better play today.

75% confidence in this read
Water temperature for brown trout
Cool — slow
7°C est.ideal 1016°C
0°14°28°
Why this score · for brown trout
  • Temperature4628% weight
  • Flow6022% weight
  • Clarity9518% weight
  • Feeding Time5513% weight
  • Pressure807% weight
  • Prey Activity3612% weight
Conditions
Level
1.37 m
Water temp
6.8°C
Estimated
Clarity
Clear
Air temp
8°C
Wind
S 5 km/h
Calm
Pressure
1019 hPa
Rain · 48h
3.0 mm
Light rain
Rain · ahead
3.1 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
Good conditions. Clarity is favourable (95), Prey activity is weakest (36).
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.

Permits & access
Permit required — see local rules.
  • Gobierno de Navarra fishing licence required
  • Border-water and named-stretch rules matter here, so check the exact tramo and permit structure before travel
  • Do not treat this as a salmon-planning venue.
Directions
About this water

The Bidasoa forms the Franco-Spanish border, draining western Navarra and the Basque side toward the Atlantic. Navarra-side tributaries and connected border-water sections are mixed limestone-sandstone freestone with moderate spate response. In practical fly-fishing terms this row is about brown trout and some sea-trout influence in lower sections, not about salmon-chasing. Middle-elevation runs with pools and broken water. Access from Bera and the western Navarran valleys.

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