Spate · Granite · Centro / Serra da Estrela

Alva

Alva — Rio Alva - Portugal
Poor · Brown Trout
Parachute Adams · 14-18
Closed season
Out of season. Plenty of other water available now.
Closed — confidence not applicable today.
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp21.9°C
  • ClarityClear
Today's fly
Parachute Adams
Parachute Adams14-18
Upstream dry, on top
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp21.9°C
ClarityClear
Weather31°C
WindSW 14 km/h
Pressure1019 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for Brown Trout
Warm — slow
22°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
Water at 21.9°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 3 active hatches hour by hour with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

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Evidence
Survey-backed · regionalModerate confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

Updated 15 hours ago

Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
1
March BrownHatch
2
3
2
GrannomHatch
2
2
Large StoneflyHatch
2
3
2
Yellow SallyHatch
2
3
2

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

Ranked for today
Brown Trout fly box
SB
Small Beetle
14-18 · Pattern
Upstream dry, on top
SS
Small Streamer
6-10 · Pattern
Swing, sub-surface
Permits & access
Permit required — see local rules.
  • Licença de Pesca Desportiva (Portuguese fishing license)
  • Regional variation; consult local authorities.
What's coming
Plan ahead
5-day outlook
Water here around 22°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Alva — Rio Alva - Portugal
    Rio Alva - Portugal
  2. Terrain map of the venue
    Terrain map
Water quality (WFD)
  • Ecology: Moderate
  • Chemical: Good
What this classification means

WFD re-coded 2026-06-18: prior id PT04MON0614 actually identifies the Rio Seia — this river was mis-tagged to a neighbouring water body. Re-mapped to PT04MON0626. Status: EEA WISE 2022 (3rd RBMP). Confidence: medium — VERIFY upper-Alva reach (several RIO ALVA bodies exist). Source: discodata.eea.europa.eu.

WFD classification · PT04MON0626

The full read · show the working · for Brown Trout · confidence 80%
How the 0 is built — score × weight = contribution
Temperature7 × 28%2.0
Flow60 × 22%13.2
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity51 × 12%6.1
Limiting factor: Water temperature (21.9°C) is outside Brown Trout's preferred range (10–16°C)= 52
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 March → 31 July
Related guides
Euro Nymphingsubsurface methods
Booking & contacts