Freestone · Limestone · Castilla y León, ES

Río Trueba

Río Trueba venue image

A Las Merindades trout river rising in the Sierra Salvada above Espinosa de los Monteros and falling east into the Nela near Medina de Pomar.

Today · Closed season
Pheasant Tail Nymph (sz 18)
Forecast · Today
Closed season
Out of season. Plenty of other water available now.
75% projected
Today's fly
Pheasant Tail Nymph (sz 18)
Pheasant Tail Nymph (sz 18)
Conditions on the water · Today
Live gauge
Level
Steady
0.10 m
Water temp12.4°C
ClarityClear
Weather18°C
WindN 11 km/h
Pressure1023 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

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.
Hatch timeline · todayPeak at 4pm

12pm(now) — Reed Smut

Stage: On emergersApproach: Emerger or dryActivity: 54%
Also:Pale Watery41%Cinnamon Sedge35%
Peak emergence window10 food groups active

Peak activity at 4pm — Blue Winged Olive (Blue Winged Olive, 11 food groups active)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds 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 · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
1
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
2
2
2
2
1
Blue Winged OliveHatch
1
2
2
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
  • Burgos provincial tramo system applies — check JCyL pesca visor before fishing.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gándara
22 km
0
Brown trout
Río Jerea
25 km
0
Brown trout
Río Carranza
26 km
0
Brown trout
Río Ebro (Burgos — Las Merindades to Miranda)
28 km
0
Brown trout
Río Nela
7.0 km
Brown trout
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

A Las Merindades trout river rising in the Sierra Salvada above Espinosa de los Monteros and falling east into the Nela near Medina de Pomar. The Trueba is one of northern Burgos's most respected wild brown trout rivers — limestone-influenced freestone geology, clear water, classic pool-riffle structure through wooded country. Heavily fished by anglers from Madrid and the Basque country. Best in the middle reaches between Espinosa and Trespaderne from late April through July; the upper Sierra Salvada gorges hold up later.

  • Limestone
The full read · show the working · for Brown Trout · confidence 75%
How the 0 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 activity45 × 12%5.4
Conditions total= 80
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
  • Trout Last Sunday of March → 31 July
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts