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

Río Lozoya (cotos & tramos)

Río Lozoya (cotos & tramos) terrain map
Terrain map

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.

Species

A side-water session, not the main event

Low and clear — careful approach country. Long leader, small flies, slower casts.

75% confidence in this read
Water temperature for brown trout
Cool — slow
6°C est.ideal 10–16°C
0°14°28°
Why this score · for brown trout
  • Temperature3528% weight
  • Flow6022% weight
  • Clarity9518% weight
  • Feeding Time4013% weight
  • Pressure807% weight
  • Prey Activity2512% weight
Conditions
Level
Dry recently
No gauge reading
Water temp
6.0°C
Estimated
Clarity
Clear
Air temp
6°C
Wind
S 6 km/h
Light breeze
Pressure
1016 hPa
Rain · 48h
0.2 mm
No meaningful rain
Rain · ahead
5.1 mm
Light rain · next 48h

Live readings — water temperature is an estimate where the gauge does not record it.

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.
Why this works
Fair conditions. Clarity is favourable (95), Prey activity is weakest (25).
Through the year
0–3 scale · May highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
1
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
1

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

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.
Directions
Apple MapsGoogle Maps
About this water

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. 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
Seasons & zones
  • Trout2nd Sunday of March → 3rd Sunday of July
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