Stillwater · Ordovician Volcanics · Wales / Snowdonia (Migneint uplands, Conwy catchment)

Llyn Diwaunedd

A moss-covered rock in the foreground of a calm upland lake, with bare mountain slopes rising behind under a clear sky.

Diwaunedd is fished, oddly enough, by a club from the Wirral — Hoylake Fly Fishers make the trip in from across the water to look after this remote patch of Snowdonia upland, which tells you something about how far anglers will travel for a lake worth the walk.

Fair · Trout
Minkie · 6-10
Fairlive now
Buzzer expected on Llyn Diwaunedd
Good wave on — drift country. A useful wave. Work the productive shore.
60% confidence

Llyn Diwaunedd is often best in spring through autumn.

What moved it
  • WindN 13 km/hGentle breeze · Gusts to 21 km/h
Today's fly
Minkie
Minkie6-10
Retrieve, sub-surface
Conditions on the water
Estimate
Wind
Gentle breeze · Gusts to 21 km/h
N 13 km/h
N
N
from the north
Wave20 cm ripple
Water temp9.6°C
Air temp13°C
CloudOvercast
Pressure1017 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 southwesterly has held for the best part of three days, running warmer than the water (12°C air against 10°C water). Expect fish at the north-eastern end — the bank it is blowing into — where the drift piles food, colour and warmth together. 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. Sedge may also come into play as the day warms. The ripple is helpful — fish should move onto the feed and a slow-drifted team or single wet will cover water well.
Where
Set up a broadside drift and cover the water systematically. Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
The plan
Plan A

Set up a broadside drift and cover the water systematically. 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

Watch for Sedge towards evening — this could be the best window of the day.

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 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 Hoylake Fly FishersAccess varies
Remote Snowdonia upland lake managed by Hoylake Fly Fishers (a Wirral-based club fishing Welsh water).
Visit official site ↗
What's coming
Plan ahead
5-day outlook
Condition match
59%
Cloud50%
Wind65%
Temp60%

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

Other water nearby · 5
Gallery · 2
  1. A moss-covered rock in the foreground of a calm upland lake, with bare mountain slopes rising behind under a clear sky.
    Llyn D'wennydd
  2. Terrain map of the venue
    Terrain map
About this water

Diwaunedd is fished, oddly enough, by a club from the Wirral — Hoylake Fly Fishers make the trip in from across the water to look after this remote patch of Snowdonia upland, which tells you something about how far anglers will travel for a lake worth the walk. The wild browns run small as a rule, most a pound or under, but there are bigger fish in there — reports of browns up to five pounds keep the water honest, the kind of story that gets repeated at the car park more often than it gets confirmed on the bank. Arctic char share the depths too, a cold-water relic most visitors never see or catch, adding a genuine oddity to what's otherwise a classic small hill lake.

  • Lake
  • Ordovician volcanics
Why this score
  • Buzzer is in its seasonal window, boosting the chance of targeted feeding.
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