Freestone · Granite · Comunidad de Madrid / Sierra Norte (Sierra de Guadarrama), ES

Río Lozoya (cotos & tramos)

Río Lozoya (cotos & tramos) — Pasarela roja sobre el rio Lozoya

The Lozoya drops from the Sierra de Guadarrama's southern slopes into a deep, granite-walled valley that models chalk-stream precision in mountain form.

Today · Closed season
Pheasant Tail Nymph
Forecast · Today
Closed season
Out of season. Try elsewhere.
45% projected
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph
Conditions on the water · Today
Live gauge
Level
Rising
0.49 m
Lifting fast
Water temp3.7°C
ClarityUnfishable
Weather8°C
WindN 18 km/h
Pressure1014 hPa
Rain · recent5.9 mm
Rain · ahead6.1 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
4°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 sedges; sin muerte stretches extend into autumn. The Lozoya runs cold from the Guadarrama; reservoir releases keep the river cool through summer warm.
Where
Cotos and tramos through the upper Lozoya valley below the dams. Pool tails and the seams behind granite boulders. Sierra-de-Guadarrama character.
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.
Hatch timeline · todayQuiet day

Low insect activity predicted today

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 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
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 fishing licence required
  • Lozoya trout fishing is governed by coto permits, CyS corridor rules, and TPE-specific conditions rather than any generic National Park permit model, so check the exact section before travel.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Molino de la Horcajada (Lozoya coto)
12 km
0
Brown trout
Río Eresma
14 km
0
Brown trout
Upper Río Manzanares (La Pedriza)
15 km
0
Brown trout
Río Cega
24 km
0
Brown trout
Embalses de Riosequillo & Puentes Viejas
22 km
Brown trout
Gallery · 2
  1. Río Lozoya (cotos & tramos) — Pasarela roja sobre el rio Lozoya
    Pasarela roja sobre el rio Lozoya
  2. Terrain map of the venue
    Terrain map
About this water

Three managed cotos—Angostura (Coto I, May to July), Rascafría (Coto II, April onwards), and Alameda (Coto III, March onwards)—offer catch-and-release water with structured access, though all close Thursdays. For walk-up fishing without a coto permit, the CyS corridor between Cotos II and III provides legitimate angler relief, though space is limited. TPE I (Riosequillo, Tue/Wed/Sat fishing with mandatory reporting) serves as an experimental alternative. Cold, clear freestone with technical runs and pocket water demands dry fly and tight-line nymphing; wild brown populations reward precision presentation with barbless single hooks and thoughtful wading.

  • Granite
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown

WFD classification · ES030MSPF0450010

The full read · show the working · for Brown Trout · confidence 50%
How the 0 is built — score × weight = contribution
Temperature13 × 28%3.6
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time50 × 13%6.5
Pressure80 × 7%5.6
Insect activity50 × 12%6.0
Limiting factor: Water temperature (4°C) is outside Brown Trout's preferred range (10–16°C)= 55
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.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 2nd Sunday of March → 3rd Sunday of July
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts
At a glance

Río Lozoya (cotos & tramos) is a freestone river in Comunidad de Madrid / Sierra Norte (Sierra de Guadarrama), Spain. Its recorded elevation is about 1,172 m above sea level and the catchment geology is granite. The river is described as roughly 40 km long. The species listed for this water is brown trout. The trout season is recorded as running from 2nd Sunday of March to 3rd Sunday of July. Best window recorded for anglers: May–June best, with the exact useful window depending on whether you are in the cotos, CyS corridor, or TPE structure. Core methods listed: dry fly; small nymph. Level and flow data for this water is linked from 2 gauges. Its Water Framework Directive ecological status is recorded as good. Nearby waters in our listings include Molino de la Horcajada (Lozoya coto) at 12 km, Río Eresma at 14 km and Upper Río Manzanares (La Pedriza) at 15 km.