Spate · Mixed · Asturias, Spain

Río Riosa

Río Riosa — Casa en Riosa
Marginal · Brown Trout
Ignita CDC · 16-20
Marginallive now
Slow going — pick your moments
River temperature is the limiting factor today, not the flow. Fish dawn or dusk if you go at all, and handle everything with extra care.
90% confidence
What moved it
  • Level0.36 mLast reading 4h ago
  • Water temp18.3°C
  • ClarityClear
Today's fly
IC
Ignita CDC16-20
Upstream dry, on top
Conditions on the water
Live gauge
Level
Steady
0.36 m
Last reading 4h ago
Water temp18.3°C
ClarityClear
Weather18°C
WindN 7 km/h
Pressure1020 hPa
Rain · recent0.0 mm
Rain · ahead4.7 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
Warm — slow
18°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
Water at 18.3°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayPeak at 6pm

Hatch predictions

Today's headline hatch shown — see all 11 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

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Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
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
Beats · 1
Riosa · 0.5 kmC&R trout
C&R trout stretch — Puente Bº La Ará Cta A-231 General to Puente pasarela aguas abajo del polideportivo.
Beat detail
Daily permit required, all fish returned
Upstream: Puente Bº La Ará Cta A-231 General
Downstream: Puente pasarela aguas abajo del polideportivo
Riosa beat map
Permits & access
Free state water
State rod licence required for trout / salmon as applicable.
  • Se requiere licencia de pesca asturiana.
What's coming
Plan ahead
5-day outlook
Water here around 18°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Río Riosa — Casa en Riosa
    Casa en Riosa
  2. Terrain map of the venue
    Terrain map
The full read · show the working · for Brown Trout · confidence 90%
How the 38 is built — score × weight = contribution
Temperature51 × 28%14.3
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time85 × 13%11.1
Pressure80 × 7%5.6
Insect activity60 × 12%7.2
Conditions total= 73
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout Third Sunday of May → 15 August

    The Riosa joins the Nalón above Puente Peñaflor (Grado) — the Nalón's salmon-zone limit — so it sits in the mountain-zone tributary network rather than the general lowland default. 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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