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.

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 Bidasoa
  • Water temp19.1°C
  • ClarityClear
Today’s fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Bidasoa
Water temp19.1°C
ClarityClear
Weather20°C
WindNW 12 km/h
Pressure1018 hPa
Rain · recent0.0 mm
Rain · ahead2.1 mm

No gauge on this water — conditions are inferred from Bidasoa. The trend transfers, the absolute level does not.

Water temperature for brown trout
Warm — slow
19°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

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Sub-surface · on the nymphunder the surface

Hatch predictions

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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.
  • 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.
What's coming
Plan ahead
5-day outlook
Water here around 19°C. Nothing cooler within range — carry a thermometer.
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 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
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown

WFD classification · ES017MSPFES002MAR002380

The full read · show the working · for brown trout · confidence 80%
How the 0 is built — score × weight = contribution
Temperature38 × 28%10.6
Flow40 × 22%8.8
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity42 × 12%5.0
Conditions total= 52
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Bidasoaproxy
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.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout1 May → 30 June

    RSS Baztan–Bidasoa basin (9,898 permits in 2026 — largest allocation in Navarra). All catch-and-release. Extendable to 15 Jul by resolution. Daily basin permit required. IMPORTANT: the Tramo Salmonero (presa de Fundiciones de Bera to Endarlatsa) is CLOSED for all of 2026 — this entry covers trout fishing in the broader Baztan–Bidasoa basin, not the salmon beat.

Sea trout: Variable seasonal (2026)

Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
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