Spate · Mixed · País Vasco / Bizkaia

Río Artibai

Río Artibai terrain map

Compact Basque spate river flowing into the Bay of Biscay at Ondarroa.

Poor · Atlantic Salmon
Closed season
Out of season. File this water for the right month.
Closed — confidence not applicable today.
What moved it
  • LevelProxyvia Urumea
  • Water temp21.9°C
  • ClarityClear
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Urumea
Water temp21.9°C
ClarityClear
Weather26°C
WindNE 11 km/h
Pressure1020 hPa
Rain · recent0.0 mm
Rain · ahead0.8 mm

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

Water temperature for Atlantic Salmon
Warm — slow
22°C est.ideal 1014°C
0°14°28°
How to fish it · for Atlantic Salmon
When
Morning into early afternoon.
Where
Pool tails, steadier runs, and any water with pace.
Method
Fish a sensible line-and-fly combination for the height and pace of water.
Kit
13 ft #8/9 double-hander in spate, 10 ft #8 single in low water. Floating line plus a fast-sink tip. 12–15 lb fluoro tippet.
Why this works
Water at 21.9°C. This is the line where catch-and-release kills atlantic salmon. Do not fish for them today.
Hatch timeline · todayPeak at 6pm

Hatch predictions

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Sub-surface · on the nymphunder the surface

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Beyond the hatch · worth watchingambient prey

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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
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Yellow SallyHatch
2
3
2

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Permits & access
Permit required — see local rules.
  • Gobierno Vasco / Diputación Foral de Bizkaia licence required
  • Check current season and quota for this river.
What's coming
Plan ahead
5-day outlook
Water here around 22°C. Nothing cooler within range — carry a thermometer.
About this water

Compact Basque spate river flowing into the Bay of Biscay at Ondarroa. Carries Atlantic salmon and sea trout runs typical of the smaller Cantabrian rivers — short, sharp responses to rain, with fish running quickly from estuary to upper beats. Part of the same Basque coastal river family as the Lea and Oka. Atlantic salmon are under serious conservation pressure and managed by cupo (quota), with catch-and-release widely applied; check the current rules before fishing.

Under the surface

The Artibai is a short Basque coastal river, around twenty kilometres from its gathering on the northern slope of Mount Oiz to the Cantabrian Sea at the fishing port of Ondarroa. It rises where mountain streams unite near Iruzubieta and Markina-Jemein and runs down a steep-sided green Bizkaian valley before the tide reaches up from Berriatua to meet it. This is a small, lively river of clear, cool water off the limestone-and-sandstone hills of the Basque country, draining a modest catchment of a hundred and seventy square kilometres through wooded slope and farmland. Like the small rivers of the Cantabrian coast it takes a run of sea trout and salmon up off the sea, the fish dependent on the rain to lift the water. The character is intimate, quick, steep-valley freestone with short pools and runs. Wading is steady on firm rock and gravel, the small clear water rewarding a quiet approach.

Wading: Quiet approach on small clear water

Hatches & food

In the steep, often pressured Atlantic rivers of the Basque Country, trout opportunities centre on spring olives and other up-wings when flows and colour briefly line up, with caddis and buzzers helping to sustain sport into early and mid-summer, and terrestrials from grassy, wooded margins adding surface food in quieter, recovering reaches.

Sea trout here

Summer-autumn runs, seasonal patterns vary by region

  • Mixed
  • Partly confined
  • Pool riffle
  • Step pool
Why this score · for Atlantic Salmon
  • Temperature030% weight
  • Flow1525% weight
  • Clarity9520% weight
  • Feeding Time10015% weight
  • Pressure8510% weight
Directions
Seasons & zones

Sea trout: Variable seasonal (2026)

Related guides
Booking & contacts