Freestone · Mixed · Castilla y León, ES

Río Arlanza

Río Arlanza — Río Arlanza a su paso por Covarrubias

The Arlanza rises in the Sierra de la Demanda near Palacios de la Sierra and runs west through the Lara highlands.

Tomorrow · Closed season
Frenchie
Forecast · Tomorrow
Closed season
Out of season. Try elsewhere.
45% projected
Today's fly
Frenchie
Frenchie
Conditions on the water · Tomorrow
Live gauge
Level
Rising
1.07 m
Lifting fast
Water temp4.1°C
ClarityUnfishable
Weather8°C
WindN 18 km/h
Pressure1014 hPa
Rain · recent49.1 mm
Rain · ahead6.2 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
Cool — slow
4°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 · tomorrowQuiet day

Low insect activity predicted today

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds as a supporter.

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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 · November 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
  • Tramo-specific rules apply — JCyL pesca visor.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Upper Río Duero
29 km
0
Brown trout
Río Revinuesa
30 km
0
Brown trout
Río Arlanzón
33 km
0
Brown trout
Río Abión
34 km
0
Brown trout
Embalse de la Cuerda del Pozo
32 km
Carp · Barbel
Gallery · 2
  1. Río Arlanza — Río Arlanza a su paso por Covarrubias
    Río Arlanza a su paso por Covarrubias
  2. Terrain map of the venue
    Terrain map
About this water

It's a named Burgos trout/cyprinid system with respectable upper-basin trout water, though a more variable identity than its sibling the Arlanzón. A solid regional river in its own right, but not in the same class as the Arlanzón as a destination.

  • Mixed
The full read · show the working · for Brown Trout · confidence 45%
How the 0 is built — score × weight = contribution
Temperature15 × 28%4.2
Flow55 × 22%12.1
Clarity0 × 18%0.0
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity27 × 12%3.2
Limiting factor: Water is unfishable — too coloured for Brown Trout= 32
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Warmer water — toward the 10–16 °C ideal band — would lift the temperature score.
A drop and clear would lift the flow and clarity scores.
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
At a glance

Río Arlanza is a freestone river in Castilla y León, Spain. It sits at about 1,055 m above sea level. The river is described as roughly 158 km long. The species listed for this water is brown trout. The trout season is recorded as running from Last Sunday of March to 31 July. Best window recorded for anglers: May–early July for the Palacios de la Sierra reach. Core methods listed: short-line nymph; dry fly; ahogada wet. Level and flow data for this water is linked from the gauge “EA165 Arlanza en Palacios de la Sierra (upper)”. Nearby waters in our listings include Upper Río Duero at 29 km, Río Revinuesa at 30 km and Embalse de la Cuerda del Pozo at 32 km.