Stillwater · Mixed · Cantabria / valle del Saja (Torina), ES

Embalse de Alsa

Embalse de Alsa venue image

Alsa is a small reservoir — a couple of square kilometres at most — tucked into the Saja country of southern Cantabria and fed, slightly confusingly, by the river Torina.

Fair · Trout
Griffith's Gnat · 18-22
Fairlive now
Reasonable autumn fishing likely at Embalse de Alsa
Good wave on — drift country. A useful wave. Work the productive shore.
56% confidence

This is peak season for Embalse de Alsa, though today's conditions aren't quite ideal. Worth fishing — the timing is right even if the weather isn't perfect.

What moved it
  • WindS 9 km/hLight breeze
Today's fly
Griffith's Gnat
Griffith's Gnat18-22
Upstream dry, on top
Conditions on the water
Estimate
Wind
Light breeze
S 9 km/h
N
S
from the south
WaveRipple
Water temp10.4°C
Air temp11°C
CloudBroken
Pressure1022 hPa
Rain · recent0.0 mm

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

Reservoir levelas of 31 Aug
92% 10-yr norm
Dropping
86% full
About normal
-5 ptsvs seasonal norm
-4 ptsvs last year
-4 ptsthis week
How to fish it · for Trout
When
Spring through summer; the bigger fish often come early and late in the day.
Where
Start with CDC F-Fly (Black) (18-22) on a As per local method. If that does not produce, switch depth or speed before changing the pattern entirely.
The plan
Plan A

Start with CDC F-Fly (Black) (18-22) on a As per local method. If that does not produce, switch depth or speed before changing the pattern entirely.

Plan B

A fry-imitating pattern stripped through the margins can save a blank in autumn.

Watch for

Keep an eye on changing conditions — wind shifts and cloud breaks can trigger short feeding spells.

Either bank or boat

Good ripple suits both bank and boat. Bank: work inflows, dam walls, and points. Boat: broadside drift covering wind lanes.

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 4 with Pro.

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Through the year
0–3 scale · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Claret DunHatch
2
3
2
Heather FlyHatch
2
2
Daddy Long LegsHatch
2
3
2
Silverhorns & LonghornsHatch
1
2
2
2
1

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

Ranked for today
Trout fly box
Permits & access
Permit required — see local rules.
  • Cantabria licence required; check the annual normativa for size limits, quotas and any seasonal closures on this reservoir
  • Atlantic salmon and barbel are also present — salmon are protected and seasonal.
What's coming
Plan ahead
5-day outlook
Condition match
88%
Cloud100%
Wind100%
Temp60%

Conditions are ideal for Embalse de Alsa — wind, cloud and temperature all line up.

Other water nearby · 5
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

Alsa is a small reservoir — a couple of square kilometres at most — tucked into the Saja country of southern Cantabria and fed, slightly confusingly, by the river Torina. Small does not mean modest. It has a quiet reputation for growing trout to a size the feeder streams never could, fish that have found a larder and made the most of it. It holds salmon and barbel as well, a reminder that the Cantabrian rivers run down to the sea not far away. You fish it from the bank, reading the drop-offs and the inflow where the cold water comes in, and you fish it patiently. It is not famous, which is rather the point — the sort of overlooked water where a good fish is a genuine surprise rather than an expectation.

  • Reservoir
  • Mixed
Why this score
  • Wind conditions (ripple) closely match what this water fishes best in.
  • Cloud cover (cloud) suits the fishery well.
Related guides
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