Spate · Mixed · Cantabria/Bizkaia border (Valle de Carranza), ES

Río Carranza

Río Carranza terrain map

A cross-border river running through the Valle de Carranza on the Cantabria-Bizkaia boundary, joining the Asón near Ramales de la Victoria.

Today · Closed season
Black Gnat
Forecast · Today
Closed season
Out of season. Plenty of other water available now.
75% projected
Today's fly
Black Gnat
Black Gnat
Conditions on the water · Today
Live gauge
Level
Steady
0.15 m
lowspate
Water temp15.4°C
ClarityClear
Weather19°C
WindN 10 km/h
Pressure1024 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Brown Trout
Ideal
15°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 · todayPeak at 11am

12pm(now) — Heather Fly

Stage: Terrestrials on topApproach: Dry flyActivity: 95%
Also:Reed Smut95%Cinnamon Sedge59%Autumn Dun51%
Peak emergence windowWeather boost12 food groups active

Peak activity at 11am — Reed Smut (Reed Smut, Peak emergence window)

Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey(1)

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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 · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
1
March BrownHatch
2
3
2
Late March BrownHatch
2
3
2
Large Brook DunHatch
2
3
2
Large StoneflyHatch
2
3
2

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.
  • Cross-border water — verify the correct licence for the bank you intend to fish.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Río Agüera
9.0 km
0
Brown trout · Sea trout
Gándara
15 km
0
Brown trout
Río Trueba
26 km
0
Brown trout
Río Campiazo
27 km
0
Brown trout · Sea trout
Asón
8.0 km
Brown trout · Sea trout
About this water

A cross-border river running through the Valle de Carranza on the Cantabria-Bizkaia boundary, joining the Asón near Ramales de la Victoria. The Carranza is granite-and-schist freestone water, with classic pool-riffle structure through the wooded middle reaches around Lanestosa. Wild brown trout only. The gauge sits at Pondra in the Asón system. Best fished from May through June; the river warms quickly in summer.

  • Mixed
The full read · show the working · for Brown Trout · confidence 55%
How the 0 is built — score × weight = contribution
Temperature93 × 28%26.0
Flow15 × 22%3.3
Clarity95 × 18%17.1
Feeding Time65 × 13%8.5
Pressure80 × 7%5.6
Insect activity40 × 12%4.8
Limiting factor: River is stable — Brown Trout prefers medium flow= 65
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
A drop and clear would lift the flow and clarity scores.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout third Sunday of March → 31 July
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts