Freestone · Limestone · Castilla y León

Río Carrión

Río Carrión terrain map
Terrain map

The Carrión flows through limestone uplands creating a classic freestone river — clear water and consistent insect productivity supporting unusually large brown trout (many exceeding three pounds).

Prime · Brown Trout
Klinkhammer · 14-18
Primelive now
About as good as it gets
Low and clear — careful approach country. Take your time — read the water before you cast.
90% confidence
What moved it
  • Level0.11 mLast reading 21h ago
  • Water temp14.5°C
  • ClarityClear
Today’s fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.11 m
Last reading 21h ago
Water temp14.5°C
ClarityClear
Weather20°C
WindNE 8 km/h
Pressure1024 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
15°C est.ideal 10–16°C
0°14°28°
How to fish it · for brown trout
When
Through the Castilla y León trout season. Spring olives April through May; summer evenings; small dark flies into autumn close.
Where
Pool tails and the seams behind boulders through the Palencia valley. The Carrión runs cool Cantabrian-fed water through the upper beats.
Method
Upstream dry to risers; dry-dropper through the riffles. The water reads clear — long leader, fine tippet, careful approach.
Kit
9 ft #4 — Castilian default. Floating line, 12 ft leader to 4 lb fluoro. Studded boots — granite cobble runs slick.
Why this works
Excellent — water temperature is right today, though insect activity could be better.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 12 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 fishing licence required
  • Many premium trout waters use the Junta's tramo-based management system, including EDE sections, so check the exact section and current rules before travel.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Río Castillería
16 km
Brown trout
Rivera de Valdavia
16 km
Brown trout
Embalse de Camporredondo
21 km
Brown trout
Upper Río Pisuerga
22 km
Brown trout
Río Camesa
25 km
Brown trout
About this water

The Carrión flows through limestone uplands creating a classic freestone river — clear water and consistent insect productivity supporting unusually large brown trout (many exceeding three pounds). Designated Coto Intensivo sections near Guardo enforce selective management and fly-only regulations protecting these fish. Stable limestone hatches (Baetis rhodani, Ephemerella notata, small olives) run April–July. A river where size and quality reward careful presentation.

  • Limestone
Water quality (WFD)
  • Ecology: Poor
  • Chemical: Unknown
What this classification means

WFD ecological status Moderate → Poor corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody ES020MSPF000000130 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · ES020MSPF000000130

The full read · show the working · for brown trout · confidence 90%
How the 85 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time75 × 13%9.8
Pressure80 × 7%5.6
Insect activity56 × 12%6.7
Conditions total= 85
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
Directions
Apple MapsGoogle Maps
Seasons & zones
  • TroutLast Sunday of March → 31 July
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
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