Freestone · Mixed · Castilla y León

Río Arlanza

Río Arlanza terrain map
Terrain map

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

Prime · Brown Trout
Klinkhammer · 14-18
Primelive now
About as good as it gets
River steady at a fishable height. On the feed top to bottom — start on the rises with a dry, drop a nymph if they stay down.
75% confidence
What moved it
  • Level0.76 mLast reading 1h ago
  • Water temp13.0°C
  • ClarityClear
Today’s fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.76 m
Last reading 1h ago
Water temp13.0°C
ClarityClear
Weather13°C
WindNE 12 km/h
Pressure1025 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
13°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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Evidence
Records-basedModerate confidence

Based on species-occurrence records, not local invertebrate surveys.

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
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.

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
Río Arlanzón
16 km
78
Brown trout
Upper Río Duero
26 km
80
Brown trout
Río Revinuesa
26 km
Brown trout
Embalse de la Cuerda del Pozo
33 km
Carp · Barbel
Río Ucero
41 km
Brown trout
About this water

The Arlanza rises in the Sierra de la Demanda near Palacios de la Sierra and runs west through the Lara highlands. A named Burgos trout/cyprinid system with respectable upper-basin trout water but more variable identity than its sibling the Arlanzón. Worth knowing as regional coverage rather than a Tier-1 destination.

  • Mixed
The full read · show the working · for brown trout · confidence 75%
How the 80 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 activity53 × 12%6.4
Conditions total= 80
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
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