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.
59% confidence

Llyn Dulyn is often best in spring through autumn.

What moved it
  • WindSW 25 km/hModerate breeze
Today's fly
Minkie
Minkie6-10
Retrieve, sub-surface
Conditions on the water
Estimate
Wind
Moderate breeze
SW 25 km/h
N
SW
from the south-west
Wave40 cm chop
Water temp11.4°C
Air temp13°C
CloudBroken
Pressure1018 hPa
Rain · recent0.0 mm

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

Head to
Wind driftSW wind
North-eastern end

A south-westerly has held for most of a day at much the same temperature as the 11°C water. No thermal steer either way, but the drift still stacks food against the north-eastern end — the bank it is blowing into — so start there. This reads the upper water, though — a bottom bait at range feels it far less than a floater or a fish in the margins. 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

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

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 2 guilds with Pro.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 5 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
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
72%
Cloud100%
Wind30%
Temp100%

A good match for Llyn Dulyn — most conditions are close to what it fishes best in.

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.
  • Cloud cover (cloud) suits the fishery well.
  • 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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