Freestone · Mixed · Castilla y León

Río Riaza

Río Riaza terrain map
Terrain map

The Riaza rises in the Sierra de Ayllón and runs through the Segovian highlands.

Prime · Brown Trout
Klinkhammer · 14-18
Primelive now
About as good as it gets
Low and clear — careful approach country. Take your time — read the water before you cast.
75% confidence
What moved it
  • Level0.03 mLast reading 1d ago
  • Water temp12.0°C
  • ClarityClear
Today’s fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.03 m
Last reading 1d ago
Water temp12.0°C
ClarityClear
Weather14°C
WindSE 6 km/h
Pressure1022 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

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

Water temperature for brown trout
Ideal
12°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
Excellent — water temperature is right today, though time of day could be better.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 10 active hatches hour by hour with Pro.

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Evidence
Records-basedModerate confidence

Based on species-occurrence records, not local invertebrate surveys.

Through the year
0–3 scale · July 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.

Ranked for today
Brown Trout fly box
Permits & access
Permit required — see local rules.
  • Castilla y León licence required
  • Tramos including Rioseco need separate permits
  • Confirm on the JCyL pesca visor.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Río Duratón
21 km
80
Brown trout
Río Madarquillos (TPE II)
28 km
Brown trout
Embalses de Riosequillo & Puentes Viejas
36 km
Brown trout
Río Cega
38 km
30
Brown trout
Embalse de El Atazar
41 km
Black bass · Pike · Carp
About this water

The Riaza rises in the Sierra de Ayllón and runs through the Segovian highlands. JCyL lists active tramos including Rioseco. The Riaza has real trout water in its upper reaches but is more conditional than Cega/Eresma — useful regional coverage, less obviously a destination. Best as a 'check the tramo' venue for anglers already in Segovia/northern Madrid.

  • Mixed
The full read · show the working · for brown trout · confidence 75%
How the 81 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time45 × 13%5.9
Pressure80 × 7%5.6
Insect activity58 × 12%7.0
Conditions total= 81
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • TroutLast Sunday of March → 31 July
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts