Spate · Slate · Asturias, Spain

Río Navelgas

Río Navelgas venue image

The Navelgas is an upland slate-moorland stream — intimate fishing in vast, open landscape.

Poor · Brown Trout
Ignita CDC · 16-20
Closed season
Out of season. Plenty of other water available now.
Closed — confidence not applicable today.
What moved it
  • Level1.35 mLast reading 2h ago
  • Water temp18.6°C
  • ClarityClear
Today's fly
Ignita CDC
Ignita CDC16-20
Upstream dry, on top
Conditions on the water
Live gauge
Level
Steady
1.35 m
lowspate
Water temp18.6°C
ClarityClear
Weather19°C
WindNE 10 km/h
Pressure1019 hPa
Rain · recent0.0 mm
Rain · ahead1.9 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
19°C est.ideal 1016°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 18.6°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 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

Top nymph shown — see all 3 guilds with Pro.

Start free trial

14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 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
Brown Trout fly box
Beats · 1
Navelgas · 2.0 kmC&R trout
C&R trout stretch — Puente de La Carrizal to 50 m aguas arriba del banzao del caserío de Vichavera.
Beat detail
Daily permit required, all fish returned
Upstream: Puente de La Carrizal
Downstream: 50 m aguas arriba del banzao del caserío de Vichavera
Navelgas 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
Water here around 19°C. Nothing cooler within range — carry a thermometer.
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

The Navelgas is an upland slate-moorland stream — intimate fishing in vast, open landscape. Dark pools and clear runs hold wild browns (12–22 cm) eager for careful presentation. The 3-hour spate response ensures quick fishing windows. Mayfly and sedge hatches productive; terrestrials work in summer. Minimal development, genuine solitude, and straightforward access. A river where slowness and observation reward patience.

Under the surface

The Navelgas is a smaller tributary arriving into the Narcea system from the north. The upper reaches are step-pool slate country, steep and responsive. The descent is rapid and the water amber-toned throughout its course. The Navelgas maintains its spate character — quick response, slate signature, responsive to Cantabrian rainfall — throughout its reach. The available pools are secondary to the river's responsive descent character. The wading demands respect throughout.

Wading: Wet slate slabs with algal film

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
  • Confined
  • Step pool
  • Cascade
Water quality (WFD)
  • EcologyGood
  • ChemicalUnknown

WFD classification · ES018MSPFES197MAR001750

The full read · show the working · for Brown Trout · confidence 80%
How the 0 is built — score × weight = contribution
Temperature46 × 28%12.9
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity55 × 12%6.6
Conditions total= 65
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
Related guides
Booking & contacts