Karst Spring · Limestone · Castilla y León, ES

Río Abión

Río Abión — Río Abión

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

Poor · Brown Trout
Pheasant Tail Nymph · 14-18
Closed season
Out of season. Try elsewhere.
Closed — confidence not applicable today.
What moved it
  • Level0.75 mLast reading 3h ago
  • Water temp5.8°C
  • ClarityClear
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.75 m
Last reading 3h ago
Water temp5.8°C
ClarityClear
Weather14°C
WindN 17 km/h
Pressure1022 hPa
Rain · recent0.4 mm
Rain · ahead0.2 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
6°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.
Likely species
Mayflies
Gammarids
Hatch timeline · todayQuiet day

Hatch predictions

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Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 2 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 · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
1
Brown SedgeHatch
2
3
3
3
2
Small SpurwingHatch
2
3
3
3
2
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2
Small Dark OliveHatch
2
3
3
3
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
0
Brown trout
Río Revinuesa
22 km
0
Brown trout
Río Ucero
43 km
0
Brown trout
Río Arlanza
45 km
0
Brown trout
Embalse de la Cuerda del Pozo
17 km
Carp · Barbel
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 70%
How the 0 is built — score × weight = contribution
Temperature33 × 28%9.2
Flow40 × 22%8.8
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity46 × 12%5.5
Conditions total= 54
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.
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