Stillwater · Ordovician Volcanics · Wales / Snowdonia (Carneddau), GB-WLS

Llyn Dulyn

Llyn Dulyn — Snowdonia

The Black Lake — fifty-eight metres deep in a brooding glacial cwm beneath Garnedd Uchaf and Foel Grach, 580 metres above sea level.

Fair · Trout
Minkie · 6-10
Fairlive now
Buzzer expected on Llyn Dulyn
Useful ripple, fishable wave. Worth a session if the wind holds.
61% confidence

Llyn Dulyn is often best in spring through autumn.

What moved it
  • WindNW 26 km/hModerate breeze · Gusts to 47 km/h
Today's fly
Minkie
Minkie6-10
Retrieve, sub-surface
Conditions on the water
Estimate
Wind
Moderate breeze · Gusts to 47 km/h
NW 26 km/h
N
NW
from the north-west
Wave40 cm chop
Water temp10.3°C
Air temp7°C
CloudOvercast
Pressure1024 hPa
Rain · recent0.0 mm

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

Head to
Wind driftW wind
Western end

A westerly has held for 14 hours, running colder than the water (7°C air against 11°C water). The end it blows into is taking that chilled surface water, so try the sheltered western end instead — off the back of the wind, where the undertow returns food along the bottom. That chill sits in the top of the water, though, and the bed is slower to feel it — on a bottom bait it is the undertow, not the temperature, that puts you at this end. Treat it as a tiebreaker between good swims rather than an override — features and angling pressure usually count for more.

How to fish it · for Trout
When
The buzzer is on. Lake Olive may also come into play as the day warms.
Where
Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
The plan
Plan A

Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.

Plan B

If the main plan is not working, switch to a smaller, more imitative pattern fished slower and deeper. A change of drift angle can also make a difference.

Watch for

Sedge should come on through the afternoon as the water warms.

Bank

Bank-only venue. Fish from accessible margins, points, weed edges, and inflows.

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 5 as a supporter.

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Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Heather FlyHatch
2
2
Daddy Long LegsHatch
2
3
2
Claret DunHatch
2
3
2
Murrough (Great Red Sedge)Hatch
2
3
2

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

Ranked for today
Trout fly box
Bays & launches · 1
Day ticket via Fishing PassportAccess varies
'Black lake' — 58m-deep glacial cwm reservoir at 580m.
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What's coming
Plan ahead
5-day outlook
Condition match
57%
Cloud50%
Wind30%
Temp100%

A reasonable day here, though wind isn't quite in the sweet spot.

Other water nearby · 5
Gallery · 2
  1. Llyn Dulyn — Snowdonia
    Snowdonia
  2. Terrain map of the venue
    Terrain map
About this water

The Black Lake — fifty-eight metres deep in a brooding glacial cwm beneath Garnedd Uchaf and Foel Grach, 580 metres above sea level. Thirteen hectares of cold, dark water holding wild brown trout and a tiny Arctic char population. Very lightly fished — two and three-quarter miles' walk in keeps it that way. Bank only, two-fish limit. The kind of place where you stop and notice you're being watched by a buzzard.

  • Lake
  • Ordovician volcanics
Why this score
  • Wind conditions (windy) are not ideal for this water.
  • Temperature (cool) is in the sweet spot for autumn fishing.
  • Buzzer is in its seasonal window, boosting the chance of targeted feeding.
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