Freestone · Slate · Castilla y León

Río Sil

Río Sil — Cañon del Río Sil desde el mirador de Vilouxe

The Sil dominates the El Bierzo landscape — 80 km of slate-based freestone with outstanding productivity.

Poor · Brown Trout
Klinkhammer · 14-18
Closed season
Out of season. Plenty of other water available now.
Closed — confidence not applicable today.
What moved it
  • Level0.12 mDropping after lift
  • Water temp23.4°C
  • ClarityUnfishableColouring up
Today's fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.12 m
Dropping after lift
Water temp23.4°C
ClarityUnfishable
Weather34°C
WindW 13 km/h
Pressure1013 hPa
Rain · recent0.5 mm
Rain · ahead0.3 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
23°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 23.4°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
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
Trout seasonSeason
1
2
2
2
1
Large Dark OliveHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Autumn OliveHatch
1
2
1
GrannomHatch
1
1

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.
  • Castilla y León fishing licence required
  • Many premium trout waters use the Junta's tramo-based management system, including EDE sections, so check the exact section and current rules before travel.
What's coming
Plan ahead
5-day outlook
Water here around 23°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Río Sil — Cañon del Río Sil desde el mirador de Vilouxe
    Cañon del Río Sil desde el mirador de Vilouxe
  2. Terrain map of the venue
    Terrain map
About this water

The Sil dominates the El Bierzo landscape — 80 km of slate-based freestone with outstanding productivity. Large wild brown populations thrive on slate geology and consistent base flows. Dramatic gorges and productive pools create varied habitat: technical upper reaches with selective fish to larger holding water downstream. Strong mayfly hatches throughout season and 8-hour response time make this a premier fly-fishing destination.

  • Slate
Water quality (WFD)
  • Ecology: Bad
  • Chemical: Unknown
What this classification means

WFD ecological status Poor → Bad corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody ES010MSPFES425MAR000880 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · ES010MSPFES425MAR000880

The full read · show the working · for Brown Trout · confidence 90%
How the 0 is built — score × weight = contribution
Temperature1 × 28%0.3
Flow80 × 22%17.6
Clarity0 × 18%0.0
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity37 × 12%4.4
Limiting factor: Water is unfishable — too coloured for Brown Trout= 37
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.
A drop and clear would lift the flow and clarity scores.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout Last Sunday of March → 31 July
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts