Freestone · Limestone · Castilla y León, ES

Río Duratón

Hoces del río Duratón - 02

The Duratón rises in the Sierra de Ayllón uplands and runs through limestone canyon country south of Sepúlveda before joining the Duero.

Poor · Brown Trout
Pheasant Tail Nymph · 14–18
Closed season
Out of season. Try elsewhere.
Closed — confidence not applicable today.
What moved it
  • Level0.88 mDropping after lift
  • Water temp5.0°C
  • ClarityColouredClearing
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph14–18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.88 m
Dropping after lift
Water temp5.0°C
ClarityColoured
Weather7°C
WindS 8 km/h
Pressure1014 hPa
Rain · recent34.0 mm
Rain · ahead9.2 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
5°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; small dark flies into autumn close.
Where
Pool tails through the Duratón gorge stretches. The river carves through limestone canyons — striking water with a dramatic backdrop.
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
Gammarids
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 2 active hatches hour by hour as a supporter.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 4 guilds as a supporter.

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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 · November 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 licence required
  • Sepúlveda-area tramos and AREs need separate permits
  • Strong tramo variation means the JCyL pesca visor is essential for choosing the right stretch.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Río Cega
24 km
0
Brown trout
Río Madarquillos (TPE II)
33 km
0
Brown trout
Molino de la Horcajada (Lozoya coto)
41 km
0
Brown trout
Río Riaza
21 km
Brown trout
Embalses de Riosequillo & Puentes Viejas
38 km
Brown trout
Gallery · 2
  1. Hoces del río Duratón - 02
  2. Terrain map of the venue
    Terrain map
About this water

The river has real wild-trout reaches in the upper basin and Sepúlveda area, but quality is highly tramo-dependent — some sections are excellent fly water, others run through warm, regulated, lower-quality reaches. Treat it as a 'check the exact tramo' venue rather than a blanket recommendation.

  • Limestone
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature23 × 28%6.4
Flow60 × 22%13.2
Clarity40 × 18%7.2
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity36 × 12%4.3
Limiting factor: Water temperature (5°C) is outside Brown Trout's preferred range (10–16°C)= 47
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Warmer water — toward the 10–16 °C ideal band — would lift the temperature score.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout Last Sunday of March → 31 July
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts
At a glance

Río Duratón is a freestone river in Castilla y León, Spain. The catchment geology is recorded as limestone, and the water sits at about 933 m above sea level. The river is described as roughly 110 km long. The species listed for this water is brown trout. The trout season is recorded as running from Last Sunday of March to 31 July. Best window recorded for anglers: April–June; the Sepúlveda canyon area can fish well into early July on cool mornings. Core methods listed: dry fly; short-line nymph; ahogada wet. Level and flow data for this water is linked from the gauge “EA012 Duratón en Sepúlveda (mid)”. Nearby waters in our listings include Río Riaza at 21 km, Río Cega at 24 km and Río Madarquillos (TPE II) at 33 km.