Freestone · Mixed · Castilla y León

Río Cega

Río Cega terrain map
Terrain map

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
Slow going — pick your moments
Low and clear — careful approach country. Cover and shadow are doing the work today.
45% confidence
limited data
What moved it
  • Level0.17 m
  • Water temp17.5°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 temp17.5°C
ClarityVery coloured
Weather18°C
WindE 12 km/h
Pressure1021 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
Poor — barometric pressure is working for you, but water clarity is the limiting factor today.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 3 active hatches hour by hour with Pro.

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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.
  • Castilla y León fishing licence required
  • Las Pegueras and Puente Segoviano cotos require additional tramo permits; both have fly-only and/or sin muerte stretches
  • JCyL pesca visor is the source of truth.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Molino de la Horcajada (Lozoya coto)
22 km
Brown trout
Río Lozoya (cotos & tramos)
24 km
Brown trout
Río Duratón
25 km
Brown trout
Embalses de Riosequillo & Puentes Viejas
25 km
Brown trout
Río Madarquillos (TPE II)
26 km
Brown trout
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 45%
How the 30 is built — score × weight = contribution
Temperature66 × 28%18.5
Flow55 × 22%12.1
Clarity15 × 18%2.7
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity37 × 12%4.4
Limiting factor: Water is very coloured — too coloured for Brown Trout= 49
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