Mountain Freestone · Granite · Comunidad de Madrid (Sierra de Guadarrama

Upper Río Manzanares (La Pedriza)

La Pedriza venue image
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Mountain headwaters of the Manzanares in the La Pedriza sector of the Sierra de Guadarrama.

Marginal · Brown Trout
Pheasant Tail Nymph · 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
  • LevelDry recentlyNo gauge reading
  • Water temp20.2°C
  • ClarityClear
Today’s fly
Pheasant Tail Nymph
Pheasant Tail Nymph14-18
High-confidence seasonal pick
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp20.2°C
ClarityClear
Weather22°C
WindSW 10 km/h
Pressure1019 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for brown trout
Warm — slow
20°C est.ideal 10–16°C
0°14°28°
How to fish it · for brown trout
When
Through the Madrid trout season. Spring olives April through May; summer evenings; small dark flies into autumn close. La Pedriza altitude means the upper Manzanares fishes later than the lower river.
Where
Upper Manzanares through La Pedriza national park. Pool tails and pocket water through dramatic granite slabs. Small intimate Sierra de Guadarrama water.
Method
Upstream dry to risers; dry-dropper through the riffles. The water reads clear — long leader, fine tippet, careful approach.
Kit
8'6 ft #3 to 9 ft #4 — small mountain stream. Floating line, 9 to 12 ft leader to 4 lb fluoro. Studded boots.
Why this works
⚠️ Water at 20.2°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots. Otherwise poor — water clarity is in the right range.
Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey

Hatch predictions

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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
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.
  • Se requiere licencia de pesca de la Comunidad de Madrid
  • Verifica cada año el estado del coto y del tramo.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Water here around 20°C — probably warm enough to stress brown trout. These are likely cooler.
Río Lozoya (cotos & tramos)
15 km
~18°C
Brown trout
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

Mountain headwaters of the Manzanares in the La Pedriza sector of the Sierra de Guadarrama. Cold, rocky, broken water with wild brown trout. No pike — this is high-altitude granite trout water entirely above the reservoirs where invasives are established.

  • Granite
The full read · show the working · for brown trout · confidence 80%
How the 26 is built — score × weight = contribution
Temperature23 × 28%6.4
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time50 × 13%6.5
Pressure80 × 7%5.6
Insect activity59 × 12%7.1
Limiting factor: Water temperature (20.2°C) is outside Brown Trout's preferred range (10–16°C)= 56
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.
The dawn and dusk windows score higher than the midday lull.
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
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