Freestone · Mixed · Castilla y León, ES

Río Riaza

Río Riaza terrain map

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

Poor · Brown Trout
Klinkhammer · 14-18
Closed season
Out of season. Plenty of other water available now.
Closed — confidence not applicable today.
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp15.7°C
  • ClarityClear
Today's fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp15.7°C
ClarityClear
Weather16°C
WindSE 9 km/h
Pressure1015 hPa
Rain · recent0.1 mm
Rain · ahead1.2 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for Brown Trout
Ideal
16°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.
Hatch timeline · todayPeak at 6am

Hatch predictions

Today's headline hatch shown — see all 9 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

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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 · August 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
0
Brown trout
Río Madarquillos (TPE II)
28 km
0
Brown trout
Río Cega
38 km
0
Brown trout
Embalses de Riosequillo & Puentes Viejas
36 km
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 the Cega or Eresma, so fishing quality varies noticeably by stretch — check current conditions and permits for the specific tramo before travelling. Best suited to anglers already in Segovia or northern Madrid rather than a dedicated long trip.

  • Mixed
The full read · show the working · for Brown Trout · confidence 90%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity64 × 12%7.7
Conditions total= 85
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout Last Sunday of March → 31 July
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts