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

Molino de la Horcajada (Lozoya coto)

Puente de Taboada * Viaducto del Lozoya

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

Tomorrow · Closed season
Pheasant Tail Nymph
Forecast · Tomorrow
Closed season
Out of season. Try elsewhere.
45% projected
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph
Conditions on the water · Tomorrow
Proxy gauge
Level
Rising
Proxy
via Río Eresma
Water temp11.3°C
ClarityUnfishable
Weather10°C
WindN 9 km/h
Pressure1023 hPa
Rain · recent12.3 mm
Rain · ahead0.0 mm

No gauge on this water — conditions are inferred from Río Eresma. The trend transfers, the absolute level does not.

Water temperature for Brown Trout
Ideal
11°C est.ideal 10–16°C
0°14°28°

We have not characterised this dam's release, so this is a general cold-release figure and could be several degrees out in either direction. Treat it as a hint, not a reading, and check locally before you fish.

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.
Likely species
Mayflies
Stoneflies
Damselflies & dragonflies
Gammarids
Hatch timeline · tomorrowPeak at 1pm

12pm(now) — Iron Blue

Stage: On emergersApproach: Emerger or dryActivity: 24%

Peak activity at 1pm — Iron Blue (Iron Blue, Weather boost)

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 · October 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
Other water nearby · 5
Río Lozoya (cotos & tramos)
12 km
0
Brown trout
Río Cega
20 km
0
Brown trout
Upper Río Manzanares (La Pedriza)
23 km
0
Brown trout
Embalses de Riosequillo & Puentes Viejas
10 km
Brown trout
Río Madarquillos (TPE II)
17 km
Brown trout
Gallery · 2
  1. Puente de Taboada * Viaducto del Lozoya
  2. Terrain map of the venue
    Terrain map
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 75%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity41 × 12%4.9
Conditions total= 79
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Río Eresmaproxy
Prey activitysurvey-backed invertebrate datasurvey
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 2nd Sunday of March → 3rd Sunday of July
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts