Freestone · Limestone · Castilla y León, ES

Upper Río Pisuerga

Upper Río Pisuerga terrain map

The upper Pisuerga flows through dramatic Cantabrian mountain terrain — 50 km of pristine freestone with prolific brown trout.

Poor · Brown Trout
Pheasant Tail Nymph · 14–18
Closed season
Out of season. Try elsewhere.
Closed — confidence not applicable today.
What moved it
  • Level0.30 mLast reading 4h ago
  • Water temp5.1°C
  • ClarityClear
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph14–18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.30 m
Last reading 4h ago
Water temp5.1°C
ClarityClear
Weather9°C
WindSE 5 km/h
Pressure1008 hPa
Rain · recent13.2 mm
Rain · ahead5.9 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
5°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
Gammarids
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 5 active hatches hour by hour as a supporter.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 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 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
11 km
0
Brown trout
Rivera de Valdavia
14 km
0
Brown trout
Río Camesa
14 km
0
Brown trout
Río Híjar
22 km
0
Brown trout
Ebro headwaters / Embalse del Ebro
30 km
Brown trout
About this water

Limestone geology ensures exceptional clarity demanding precise presentation. Pocket-water in upper reaches transitions to productive pools and runs downstream. Excellent Baetis and Ephemerella hatches late March–July reward technical dry-fly work.

  • Limestone
Water quality (WFD)
  • Ecology: Moderate
  • Chemical: Unknown

WFD classification · ES020MSPF000000057

The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature24 × 28%6.7
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity46 × 12%5.5
Limiting factor: Water temperature (5.1°C) is outside Brown Trout's preferred range (10–16°C)= 60
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
At a glance

Upper Río Pisuerga is a freestone river in Castilla y León, Spain. The catchment geology is recorded as limestone, and the water sits at about 946 m above sea level. The river is described as roughly 50 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: March–July (season); best dry fly May–June. Core methods listed: dry fly; nymph; streamer or wet fly on larger reaches. Level and flow data for this water is linked from 1 gauge. Its Water Framework Directive ecological status is recorded as moderate. Nearby waters in our listings include Río Castillería at 11 km, Rivera de Valdavia at 14 km and Río Camesa at 14 km.