Spate · Limestone · Asturias, Spain

Río Casaño

Río Casaño
Tomorrow · About as good as it gets
Pheasant Tail Nymph (sz 18)
Forecast · Tomorrow
About as good as it gets
On the feed top to bottom — start on the rises with a dry, drop a nymph if they stay down.
90% projected
Today's fly
Pheasant Tail Nymph (sz 18)
Pheasant Tail Nymph (sz 18)
Conditions on the water · Tomorrow
Live gauge
Level
Falling
0.60 m
lowspate
Water temp15.2°C
ClaritySlightly coloured
Weather22°C
WindN 6 km/h
Pressure1027 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.
Why this works
Good — water temperature is working for you, but river flow is the limiting factor today.
Likely species
Gammarids
Hatch timeline · tomorrowPeak at 15h

12h(now) — Black Gnat

Stage: On emergersApproach: Emerger or dryActivity: 48%
Also:Iron Blue23%
Peak emergence window8 food groups active

Peak activity at 15h — Small Dark Olive (Small Dark Olive, 9 food groups active)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds as a supporter.

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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 · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
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
Fly box · Brown Trout
SC
Small ChironomidTop
22-24 · Pattern
Upstream dry, on top
Permits & access
Permit required — see local rules.
  • Asturian licencia de pesca required
  • Cabrales is part of the Picos de Europa national park — check special protection rules and any coto allocation before fishing.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Río Cares
6.0 km
82
Brown trout · Salmon · Sea trout
Río Purón
13 km
78
Brown trout · Sea trout
Río Bedón
16 km
Brown trout · Sea trout
Río Deva
19 km
66
Brown trout · Salmon · Sea trout
Río Dobra
22 km
30
Brown trout
Gallery · 2
  1. Río Casaño
  2. Terrain map of the venue
    Terrain map
The full read · show the working · for Brown Trout · confidence 75%
How the 76 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow40 × 22%8.8
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity54 × 12%6.5
Conditions total= 76
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout Troisième Sunday de May → 15 August

    The Casaño is a headwater tributary of the Cares, draining the Picos de Europa above the Cares' salmon-zone reserve limit, so it sits in the mountain-zone tributary network. Mountain-zone trout (zona de alta montaña): opens Third Sunday of May, not the general 15 March, minimum size 17cm (vs. 19cm general). Asturian regulation classifies any tributary joining above a salmon river's designated zone-limit point as alta montaña water. Inferred here from confluence position, not a verified lookup against the official cotos map (pescafluvial.asturias.es) — confirm before treating as final.

Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
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