Freestone · Limestone · Castilla y León

Upper Río Duero

Upper Río Duero terrain map
Terrain map

The upper Duero navigates beautiful limestone plateau country above Soria — 40 km of clear water and productive brown trout habitat.

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
  • Temperature3728% weight
  • Flow8022% weight
  • Clarity9518% weight
  • Feeding Time4513% weight
  • Pressure807% weight
  • Prey Activity2812% weight
Conditions
Level
0.37 m
Water temp
6.1°C
Estimated
Clarity
Clear
Air temp
4°C
Wind
NE 6 km/h
Calm
Pressure
1018 hPa
Rain · 48h
0.4 mm
No meaningful rain
Rain · ahead
2.1 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
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
Good conditions. Clarity is favourable (95), Prey activity is weakest (28).
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 fishing licence required
  • Many premium trout waters use the Junta's tramo-based management system, including EDE sections, so check the exact section and current rules before travel.
Directions
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About this water

The upper Duero navigates beautiful limestone plateau country above Soria — 40 km of clear water and productive brown trout habitat. Classic high-altitude freestone fishing with excellent insect diversity and selectively rising fish. Strong limestone mayfly hatches (Baetis in spring, Ephemerella in early summer) support consistent dry-fly opportunity. Evening spinner falls from May onwards reward technical work.

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