Karst Spring · Limestone · Castilla y León

Río Abión

Río Abión — Río Abión

A spring-fed Duero tributary rising at La Fuentona near Muriel de la Fuente.

Good · Brown Trout
Klinkhammer · 14-18
Goodlive now
A proper day on the water
River steady at a fishable height. A proper day for it. Work the seams with an upstream nymph, switch to the dry when they show.
90% confidence
What moved it
  • Level0.80 mLast reading 4h ago
  • Water temp16.9°C
  • ClarityClear
Today's fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.80 m
Last reading 4h ago
Water temp16.9°C
ClarityClear
Weather20°C
WindNE 13 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
Warm — slow
17°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
Good — water clarity is right today, though time of day could be better.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 6 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
  • La Fuentona natural monument — verify access rules at the source pool
  • Calatañazor and Berlanga sections more accessible.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Upper Río Duero
19 km
81
Brown trout
Río Revinuesa
22 km
Brown trout
Embalse de la Cuerda del Pozo
33 km
Carp · Barbel
Río Ucero
43 km
Brown trout
Río Arlanza
45 km
Brown trout
Gallery · 2
  1. Río Abión — Río Abión
    Río Abión
  2. Terrain map of the venue
    Terrain map
About this water

A spring-fed Duero tributary rising at La Fuentona near Muriel de la Fuente. The Abión is one of central Spain's most distinctive trout rivers — limestone karst spring water, clear and cool through summer when surrounding rivers warm. Wild brown trout. The upper reaches around La Fuentona are protected (natural monument) and require careful interpretation of access rules; the middle reaches between Calatañazor and Berlanga offer the most accessible fishing.

  • Limestone
The full read · show the working · for Brown Trout · confidence 90%
How the 78 is built — score × weight = contribution
Temperature79 × 28%22.1
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity67 × 12%8.0
Conditions total= 78
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