Spate · Slate · Asturias, Spain

Río Porcía

Río Porcía — Río Porcía

The Porcía is a responsive slate-country stream flowing 22 km through pastoral valleys.

Marginal · Sea Trout
Black & Silver Tube · 1-2 inch
Marginallive now
Marginal — persistence required
River dropping into shape after a lift. A short window. Work the obvious lies and move on.
75% confidence
What moved it
  • Level1.45 mDropping after lift
  • Water temp17.7°C
  • ClarityColouredClearing
Today's fly
BS
Black & Silver Tube1-2 inch
In deep pools and dark water, silhouette and contrast do the work colour cannot. A fly that reads as black against depth is enough. Fish it broadside, hold the swing, let it hang at the dangle — that is when the best fish take.
Conditions on the water
Live gauge
Level
Steady
1.45 m
lowspate
Water temp17.7°C
ClarityColoured
Weather17°C
WindNE 19 km/h
Pressure1018 hPa
Rain · recent0.0 mm
Rain · ahead4.4 mm

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

Water temperature for Sea Trout
Warm — slow
18°C est.ideal 815°C
0°14°28°
How to fish it · for Sea Trout
When
From dusk into the first half of the night.
Where
Deeper pools and slower glides · hold water and current seams.
Method
Fish dark patterns on a sink-tip or lightly sunk line, especially near structure.
Kit
10 ft #6/7 rod, floating line with a sink-tip option, 8–10 lb fluoro tippet for the swing.
Why this works
Fair — time of day is working for you, but water temperature is the limiting factor today. ⏰ Sea trout become most active from an hour before dusk. This stretch closes at 22:15 — your legal window captures the start of the best fishing. Fish the last 90 minutes hard. Overcast evenings extend the effective window.
Hatch timeline · todayPeak at 6am

Hatch predictions

Today's headline hatch shown — see all 8 active hatches hour by hour with Pro.

Start free trial

14-day free trial. Cancel anytime.

Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read with Pro.

Start free trial

14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey

Hatch predictions

See what else is on the menu with Pro.

Start free trial

14-day free trial. Cancel anytime.

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.

Ranked for today
Sea Trout fly box
BS
Black & Silver TubeTop
1-2 inch · Tube
In deep pools and dark water, silhouette and contrast do the work colour cannot. A fly that reads as black against depth is enough. Fish it broadside, hold the swing, let it hang at the dangle — that is when the best fish take.
SF
Snake Fly (Black)
2-4 inch · Streamer
A mobile eel-like profile that undulates through deep pools — effective when sea trout are lying deep and not responding to conventional wets.
Beats · 1
Porcia · 3.2 kmTrout permit
Trout permit stretch — La Corveira, puente del ferrocarril to 100 m por aguas arriba de la zona de embarcadero de las Barcas en Gobaz.
Beat detail
Daily permit required, keep within bag limits
Upstream: La Corveira, puente del ferrocarril
Downstream: 100 m por aguas arriba de la zona de embarcadero de las Barcas en Gobaz
Porcia beat map
Permits & access
Free state water
State rod licence required for trout / salmon as applicable.
  • Asturian fishing licence required
  • In 2026 many trout waters run to 15 August, but salmon zones, mountain zones, tramos sin muerte, and border stretches can differ
  • Check local coto and tramo rules before fishing.
What's coming
Plan ahead
5-day outlook
Fishing better nearby · 5
Gallery · 2
  1. Río Porcía — Río Porcía
    Río Porcía
  2. Terrain map of the venue
    Terrain map
About this water

The Porcía is a responsive slate-country stream flowing 22 km through pastoral valleys. Dark, polished pools and fast runs hold wild browns (14–26 cm, with larger residents in deep pools). The 3-hour spate response makes it perfect for visiting anglers. Mayfly and sedge hatches May–June; terrestrials work in summer. Straightforward roadside access and usually uncrowded, but Asturian licence and local tramo rules still apply. A river where responsive water rewards patient, careful presentation.

Under the surface

The Porcía runs from western Asturian slate country down toward the coast at Llanes province. The upper reaches are step-pool slate pocket water, steep and spate-responsive. The descent is rapid and the water amber-colored from its slate origins throughout. The middle Porcía opens slightly into partly-confined pool-riffle on cobble emerging from slate. The pools have been fished for generations; they're marked and known by local tradition. The river maintains its spate character — quick to rise, quick to fall, responsive to weather — throughout its course. The wading demands attention in the upper sections; the middle reaches become more approachable.

Wading: Slick wet slate ledges

Hatches & food

In the mountain-to-sea trout rivers of Asturias, olives and other mayflies do much of the work in spring whenever levels and colour allow, followed by strong evening caddis and steady buzzer life through early and mid-summer, with terrestrials and mixed surface food from wooded, pastoral banks rounding out the diet whenever flows drop back into safe wading range.

  • Slate
  • Partly confined
  • Step pool
  • Plane bed
Water quality (WFD)
  • EcologyGood
  • ChemicalUnknown

WFD classification · ES018MSPFES236MAR002170

Why this score · for Sea Trout
  • Temperature2128% weight
  • Flow8022% weight
  • Clarity7018% weight
  • Feeding Time10013% weight
  • Pressure857% weight
  • Insect activity4612% weight
Directions
Seasons & zones

Sea trout: Variable seasonal (2026)

Related guides
Booking & contacts