Freestone · Mixed · Castilla y León, ES

Río Cega

Río Cega — Río Cega 1

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

Tomorrow · Closed season
Frenchie
Forecast · Tomorrow
Closed season
Out of season. Try elsewhere.
45% projected
Today's fly
Frenchie
Frenchie
Conditions on the water · Tomorrow
Live gauge
Level
Rising
0.15 m
Lifting fast
Water temp7.7°C
ClarityUnfishable
Weather17°C
WindN 10 km/h
Pressure1023 hPa
Rain · recent0.5 mm
Rain · ahead2.5 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
Cool — slow
8°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.
Likely species
Caddisflies
Gammarids
Hatch timeline · tomorrowPeak at 11am

12pm(now) — Autumn Needle Fly

Stage: Creeping nymphsApproach: Heavy nymphActivity: 29%
Also:Black Midge28%
Peak emergence windowWeather boost4 food groups active

Peak activity at 11am — Autumn Needle Fly (Autumn Needle Fly, Peak emergence window)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Supporters see what else is on the menu.

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Evidence
Survey-backed · regionalHigh confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

Through the year
0–3 scale · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
1
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
2
2
2
2
1
Blue Winged OliveHatch
1
2
2
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)
20 km
Brown trout
Embalses de Riosequillo & Puentes Viejas
23 km
Brown trout
Río Duratón
24 km
Brown trout
Río Lozoya (cotos & tramos)
24 km
Brown trout
Río Madarquillos (TPE II)
24 km
Brown trout
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 90%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity71 × 12%8.5
Conditions total= 80
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout Last Sunday of March → 31 July
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts