Spate · Limestone · Cantabria, ES

Asón

Asón venue image
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Probably the best-known eastern salmonid basin in Cantabria.

Good · Brown Trout
Klinkhammer · 14-18
Goodlive now
A proper day on the water
River steady at a fishable height. A proper day for it. Work the seams with an upstream nymph, switch to the dry when they show.
75% confidence
What moved it
  • Level0.65 mDropping in the last 6h
  • Water temp16.5°C
  • ClarityClear
Today’s fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.65 m
lowspate
Water temp16.5°C
ClarityClear
Weather20°C
WindN 9 km/h
Pressure1026 hPa
Rain · recent10.7 mm
Rain · ahead3.3 mm

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

Water temperature for brown trout
Warm — slow
17°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.
Why this works
Good — water clarity is working for you, but river flow is the limiting factor today.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 5 active hatches hour by hour 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
2
2
2
1
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.

Ranked for today
Brown Trout fly box
Permits & access
Permit required — see local rules.
  • Cantabrian fishing licence required
  • Annex-driven basin rules, named no-kill stretches, and coto conditions matter more than generic salmon-river language, so check the exact stretch before travel.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Río Carranza
8.0 km
Brown trout
Gándara
11 km
Brown trout
Río Agüera
12 km
Brown trout · Sea trout
Río Campiazo
20 km
Brown trout · Sea trout
Río Aguanaz
23 km
Brown trout
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

Probably the best-known eastern salmonid basin in Cantabria. Crystal-clear limestone river rising in Picos de Europa karst with exceptional water quality. Heavily managed: cotos, special no-kill trout stretches, protected zones and changing rules by annex. The compact 39 km concentrates excellent fishing with 4-hour spate response. Salmon belong mainly to the river's historical prestige now; wild brown trout in upper sections are the real practical interest for fly anglers, with sea trout adding later-season migratory value. Limestone geology creates characteristic pale turquoise pools ideal for sight-fishing with small nymphs and dries.

  • Limestone
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown

WFD classification · ES018MSPFES078MAR000050

The full read · show the working · for brown trout · confidence 75%
How the 74 is built — score × weight = contribution
Temperature88 × 28%24.6
Flow40 × 22%8.8
Clarity95 × 18%17.1
Feeding Time85 × 13%11.1
Pressure80 × 7%5.6
Insect activity54 × 12%6.5
Conditions total= 74
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Troutthird Sunday of March → 31 July
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts