Freestone · Granite · Comunidad de Madrid / Sierra Norte (lower Lozoya, below Pinilla), ES

Molino de la Horcajada (Lozoya coto)

Molino de la Horcajada (Lozoya coto) terrain map

Named coto on the lower Río Lozoya below the Pinilla reservoir, run by the Sociedad de Pescadores Molino de la Horcajada.

Poor · Brown Trout
Pheasant Tail Nymph · 14-18
Closed season
Out of season. Plenty of other water available now.
Closed — confidence not applicable today.
What moved it
  • Level0.48 mLast reading 6h ago
  • Water temp18.3°C
  • ClarityClear
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.48 m
Last reading 6h ago
Water temp18.3°C
ClarityClear
Weather18°C
WindN 26 km/h
Pressure1014 hPa
Rain · recent0.0 mm
Rain · ahead0.3 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
Warm — slow
18°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Why this works
Water at 18.3°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayPeak at 6pm

Hatch predictions

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

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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 · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
1
Large Dark OliveHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Autumn OliveHatch
1
2
1
Brown SedgeHatch
1
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.
  • Comunidad de Madrid licence required
  • Coto permits issued by the local Sociedad de Pescadores — fly-only, barbless, catch-and-release on Tramo I
  • Closed Thursdays.
What's coming
Plan ahead
5-day outlook
Water here around 18°C. Nothing cooler within range — carry a thermometer.
About this water

Named coto on the lower Río Lozoya below the Pinilla reservoir, run by the Sociedad de Pescadores Molino de la Horcajada. Tramo I — roughly 3.5 km — is catch-and-release, fly-only (artificial fly, perdigones, or streamers), all barbless. The dam releases above keep the water cooler than the surrounding lowlands well into summer, which is the main reason this stretch fishes through August when most of central Spain is unfishable. Stocking influence is present and pressure varies by weekend, so treat it as a managed Spanish coto rather than wild headwater fishing.

  • Granite
Water quality (WFD)
  • Ecology: Unknown
  • Chemical: Unknown
The full read · show the working · for Brown Trout · confidence 80%
How the 0 is built — score × weight = contribution
Temperature36 × 28%10.1
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure85 × 7%6.0
Insect activity56 × 12%6.7
Conditions total= 68
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 2nd Sunday of March → 3rd Sunday of July
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts