Stillwater · Limestone · Asturias / Morcín–Riosa

Embalse de los Alfilorios

Embalse de los Alfilorios terrain map

Alfilorios is a small thing with a complicated job: it supplies Oviedo with drinking water and, since 2020, doubles as a trout coto — the sort of pragmatic arrangement Asturias does rather well.

Fair · Trout
Perdigón · 14-18
Fairlive now
Good summer conditions for Embalse de los Alfilorios
Good wave on — drift country. A useful wave. Work the productive shore.
62% confidence
What moved it
  • WindNE 7 km/hLight breeze
Today's fly
Perdigón
Perdigón14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Wind
Light breeze
NE 7 km/h
N
NE
from the north-east
WaveRipple
Water temp
Air temp18°C
CloudOvercast
Pressure1017 hPa
Rain · recent0.0 mm

Some readings unavailable — check directly before fishing.

Reservoir levelas of 13 Jul
81% 10-yr norm
Steady
63% full
Low & steady
-19 ptsvs seasonal norm
-12 ptsvs last year
0 ptsthis week
Below seasonal norm but level steady — fish should be settled to the new shoreline.
How to fish it · for Trout
When
March to August (coto open season). Quiet weekday permits are easiest to come by.
Where
Start with Foam Beetle (14-18) 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 Foam Beetle (14-18) on a As per local method. If that does not produce, switch depth or speed before changing the pattern entirely.

Plan B

Fish early and late, try deeper during the heat of the day with a fast-sinking line.

Watch for

Evening tends to be the best period in summer — stay late if you can for a sedge or spinner fall.

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

Hatch predictions

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Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Green PeterHatch
2
3
2
Murrough (Great Red Sedge)Hatch
2
3
2
Mayfly (Green Drake)Hatch
2
2
Daddy Long LegsHatch
2
3
2

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.
  • Asturias licence + Alfilorios coto permit required
  • Bank only — no boats (drinking-water reservoir)
  • Limited to 3 anglers/day and 3 trout/angler/day; sin muerte once the cup is reached
  • Stocked with adult native brown trout.
What's coming
Plan ahead
5-day outlook
Condition match
73%
Cloud50%
Wind100%
Temp60%

A good match for Embalse de los Alfilorios — most conditions are close to what it fishes best in.

Other water nearby · 5
About this water

Alfilorios is a small thing with a complicated job: it supplies Oviedo with drinking water and, since 2020, doubles as a trout coto — the sort of pragmatic arrangement Asturias does rather well. The fishing nearly didn't survive. The original stock wore thin faster than anyone had budgeted for, and the answer was to put back adult native brown trout, fish too old for the rivers, to keep the place ticking over. It is bank fishing only, three rods a day and three fish, so you fish it slowly and you fish it properly. Nymph the margins, watch for an evening rise, and don't expect a crowd. For a reservoir that exists to fill taps, it fishes with surprising charm.

  • Reservoir
  • Limestone
Why this score
  • Wind conditions (ripple) closely match what this water fishes best in.
  • Below seasonal norm but level steady — fish should be settled to the new shoreline.
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