Freestone · Mixed · Castilla y León

Río Cega

Río Cega — Río Cega 1
Contributor photo

Río Cega 1

Victor Salvador Vilariño (https://commons.wikimedia.org/w/index.php?title=User:Victor_Salvador_Vilari%C3%B1o&action=edit&redlink=1) - CC BY-SA

The Cega rises in the Sierra de Guadarrama (Navafría–Pajares de Pedraza area) and threads down through the Segovian uplands.

Marginal · Brown Trout
Klinkhammer · 14-18
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.
80% confidence
What moved it
  • Level0.17 m
  • Water temp18.0°C
  • ClarityVery colouredColouring up
Today’s fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Rising
0.17 m
Water temp18.0°C
ClarityVery coloured
Weather19°C
WindSW 9 km/h
Pressure1018 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

Live readings — water temperature is an estimate where the gauge does not record it.

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
Through the Castilla y León trout season. Spring olives April through May; summer sedges in evening hours; small dark flies into autumn close.
Where
Pool tails and pocket water through the Segovian valley. The Cega runs from the Guadarrama — clear granite water, intimate scale.
Method
Upstream dry to risers; dry-dropper through the riffles. The water reads clear — long leader, fine tippet, careful approach.
Kit
9 ft #4 — Castilian default. Floating line, 12 ft leader to 4 lb fluoro. Studded boots — granite cobble runs slick.
Why this works
⚠️ Water at 18°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots. Otherwise poor — barometric pressure is in the right range.
Hatch timeline · todayQuiet day

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Sub-surface · on the nymphunder the surface

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Beyond the hatch · worth watchingambient prey

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Evidence
Records-basedModerate confidence

Based on species-occurrence records, not local invertebrate surveys.

Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
1
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
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.
  • Se requiere licencia de pesca de Castilla y León
  • Los cotos de Las Pegueras y Puente Segoviano requieren permisos de tramo adicionales; ambos tienen tramos solo de mosca y/o sin muerte
  • El visor de pesca de la JCyL es la fuente de referencia.
What's coming
Plan ahead
5-day outlook
Water here around 18°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Río Cega — Río Cega 1
    Río Cega 1
  2. Terrain map of the venue
    Terrain map
About this water

The Cega rises in the Sierra de Guadarrama (Navafría–Pajares de Pedraza area) and threads down through the Segovian uplands. JCyL manages several recognised cotos here — Las Pegueras (fly-only / sin muerte) and Puente Segoviano are the standout fly-fishing tramos. Cool mountain origins keep the upper river fishable longer than most central-meseta waters; lower reaches warm and shrink in late summer.

  • Mixed
The full read · show the working · for brown trout · confidence 80%
How the 30 is built — score × weight = contribution
Temperature56 × 28%15.7
Flow55 × 22%12.1
Clarity15 × 18%2.7
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity40 × 12%4.8
Limiting factor: Water is very coloured — too coloured for Brown Trout= 46
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
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.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • TroutLast Sunday of March → 31 July
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts