Spate · Limestone · Castilla y León, ES

Porma

Porma — Aquí estuvo Vegamián
Poor · Brown Trout
Pheasant Tail Nymph · 14-18
Closed season
Out of season. Try elsewhere.
Closed — confidence not applicable today.
What moved it
  • Level0.34 mLast reading 6h ago
  • Water temp6.2°C
  • ClarityClear
Today's fly
Pheasant Tail Nymph
Pheasant Tail Nymph14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.34 m
Last reading 6h ago
Water temp6.2°C
ClarityClear
Weather12°C
WindN 9 km/h
Pressure1024 hPa
Rain · recent0.0 mm
Rain · ahead0.0 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
Through the Castilla y León trout season. Spring olives April through May; summer sedges; small dark flies into autumn close. The Porma is fed by a Cantabrian dam — cool releases keep the river fishing through summer.
Where
Pool tails and the seams behind boulders through the León beats below the Porma reservoir. Classic Cantabrian Mountains trout water with strong specimen-trout reputation.
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.
Likely species
Mayflies
Gammarids
Hatch timeline · todayPeak at 11h

Hatch predictions

Today's headline hatch shown — see all 5 active hatches hour by hour 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
Late March BrownHatch
2
3
2
Large Brook DunHatch
2
3
2
Large StoneflyHatch
2
3
2
Olive UprightHatch
2
3
3
2

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Fly box · Brown Trout
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 Esla
11 km
0
Brown trout
Río Curueño
12 km
0
Brown trout
Río Bernesga
20 km
0
Brown trout
Río Remolina
20 km
0
Brown trout
Río Torío
23 km
0
Brown trout
Gallery · 2
  1. Porma — Aquí estuvo Vegamián
    Aquí estuvo Vegamián
  2. Terrain map of the venue
    Terrain map
Water quality (WFD)
  • Ecology: Moderate
  • Chemical: Unknown
What this classification means

WFD ecological status Good → Moderate corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody ES020MSPF000000029 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · ES020MSPF000000029

The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature38 × 28%10.6
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity25 × 12%3.0
Conditions total= 55
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 Dernier Sunday de March → 31 July
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts