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

Llyn Diwaunedd

Llyn Diwaunedd terrain map
Terrain map

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.

Marginal · Trout
Diawl Bach · 12-14
A patient day, if you fancy it
Water temperature is the limiting factor today, not the wave. Fish dawn or dusk if you go at all, and handle everything with extra care.
42% confidence
limited data
What moved it
  • WindS 7 km/hLight breeze
Today’s fly
Diawl Bach
Diawl Bach12-14
Washing-line, sub-surface
Conditions on the water
Live gauge
Wind
Light breeze
S 7 km/h
N
S
from the south
WaveRipple
Water temp
Air temp30°C
CloudClear
Pressure1019 hPa
Rain · recent0.0 mm

Some readings unavailable — check directly before fishing.

How to fish it · for trout
When
The damsel nymph 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. Keep a sedge-style dry or emerger on a short leader for the evening rise.
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. Keep a sedge-style dry or emerger on a short leader for the evening rise.

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.

Boat — drift

A gentle ripple is ideal for drifting — broadside drift covering the wind lanes should be productive.

Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Daddy Long LegsHatch
2
3
2
Murrough (Great Red Sedge)Hatch
2
3
2
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2
Lake OliveHatch
1
2
2
2
2
2
1

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).
What's coming
Plan ahead
5-day outlook
Condition match
55%
Cloud25%
Wind100%
Temp25%

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

Other water nearby · 5
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 volcanic
Why this score
  • Wind conditions (ripple) closely match what this water fishes best in.
  • High temperatures may push fish deeper and reduce surface activity.
  • Damsel Nymph is in its seasonal window, boosting the chance of targeted feeding.
Related guides
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