Karst Spring · Limestone · Castilla y León

Río Ucero

Río Ucero — Cañón del Río Lobos Soria con Ermita de San Bartolomé de Ucero

A short, picturesque Duero tributary rising at the spring of Ucero and falling through the Cañón del Río Lobos before joining the Duero near El Burgo de Osma.

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.
65% confidence
What moved it
  • Level0.13 mLast reading 23h ago
  • Water temp15.5°C
  • ClarityClear
Today's fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Falling
0.13 m
Last reading 23h ago
Water temp15.5°C
ClarityClear
Weather17°C
WindE 11 km/h
Pressure1016 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
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.
Why this works
Excellent — water temperature is working for you, but time of day is the limiting factor today.
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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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 3 with Pro.

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Evidence
Survey-backed · regionalModerate confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

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
Brown SedgeHatch
2
3
2
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2
Blue Winged OliveHatch
2
3
3
3
3
2
Mayfly (Green Drake)Hatch
2
2

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
  • Cañón del Río Lobos natural park — verify access rules and any closed sections before fishing.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Upper Río Duero
35 km
81
Brown trout
Río Arlanza
41 km
Brown trout
Río Revinuesa
43 km
Brown trout
Río Abión
43 km
78
Brown trout
Río Riaza
52 km
Brown trout
Gallery · 2
  1. Río Ucero — Cañón del Río Lobos Soria con Ermita de San Bartolomé de Ucero
    Cañón del Río Lobos Soria con Ermita de San Bartolomé de Ucero
  2. Terrain map of the venue
    Terrain map
About this water

A short, picturesque Duero tributary rising at the spring of Ucero and falling through the Cañón del Río Lobos before joining the Duero near El Burgo de Osma. The Ucero combines karst clarity and a dramatic gorge setting with reliable wild brown trout fishing. The middle reaches between Ucero village and El Burgo offer the most accessible water; the gorge itself is partially within the natural park and requires careful access checks.

  • Limestone
The full read · show the working · for Brown Trout · confidence 65%
How the 81 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity63 × 12%7.6
Conditions total= 81
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
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