Freestone · Granite · Castilla y León

Río Eresma

Río Eresma terrain map
Terrain map

The Eresma rises in the Sierra de Guadarrama at Valsaín — the upper river through La Granja and into Segovia city is genuine wild-trout water, with strong granite-headwater character and excellent clarity.

Species

A side-water session, not the main event

River steady at a fishable height. A patient day. Fish the cover and stay with it.

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
  • Temperature3028% weight
  • Flow8022% weight
  • Clarity9518% weight
  • Feeding Time4513% weight
  • Pressure807% weight
  • Prey Activity2312% weight
Conditions
Level
0.74 m
Water temp
5.6°C
Estimated
Clarity
Clear
Air temp
5°C
Wind
NE 4 km/h
Calm
Pressure
1016 hPa
Rain · 48h
0.1 mm
No meaningful rain
Rain · ahead
4.8 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 Castilla y León trout season — 3rd Sunday of March to 31 July. Spring olives April through May; summer sedges in evening hours; sin muerte stretches extend through autumn.
Where
Pool tails, riffle heads, and the seams behind boulders through the Segovian beats. The Eresma runs from the Sierra de Guadarrama through clear granite pocket water.
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 (23).
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.
  • Castilla y León licence required
  • The Valsaín–La Granja stretch is the wild-trout identity of the river; lower city/agricultural beats follow different (often stocked) management
  • Match the tramo to your goal before booking.
Directions
Apple MapsGoogle Maps
About this water

The Eresma rises in the Sierra de Guadarrama at Valsaín — the upper river through La Granja and into Segovia city is genuine wild-trout water, with strong granite-headwater character and excellent clarity. Lower reaches downstream of Segovia city become more mixed: stocked beats, urban influence, and warmer summer flow mean the Eresma's fly-fishing identity sits firmly in the upper basin around Valsaín / La Granja, not in the broader river.

  • Granite
Seasons & zones
  • TroutLast Sunday of March → 31 July
Other water nearby · 5