- Ecology: Good
- Chemical: Unknown
WFD classification · ES030MSPF0450010
Water temperature for Brown Trout
Warm — slow18°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.
Why this works
Water at 18.1°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 6am
Hatch predictions
Today's headline hatch shown — see all 4 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
Top prey shown — see all 2 with Pro.
Start free trial14-day free trial. Cancel anytime.
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
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.
- 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
Water here around 18°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
Pasarela roja sobre el rio Lozoya Terrain map
Water quality (WFD)
The full read · show the working · for Brown Trout · confidence 80%
How the 0 is built — score × weight = contribution
Temperature54 × 28%15.1
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity65 × 12%7.8
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.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 2nd Sunday of March → 3rd Sunday of July
Related guides
Booking & contacts
Río Lozoya (cotos & tramos)
Water temperature for Brown Trout
Warm — slow18°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.
Why this works
Water at 18.1°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 6am
Hatch predictions
Today's headline hatch shown — see all 4 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
Top prey shown — see all 2 with Pro.
Start free trial14-day free trial. Cancel anytime.
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
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.
- 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
Water here around 18°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
Pasarela roja sobre el rio Lozoya Terrain map
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · ES030MSPF0450010
The full read · show the working · for Brown Trout · confidence 80%
How the 0 is built — score × weight = contribution
Temperature54 × 28%15.1
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity65 × 12%7.8
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.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 2nd Sunday of March → 3rd Sunday of July
Related guides
Booking & contacts