Stillwater · Ordovician Volcanics · Wales / Snowdonia (Blaenau Ffestiniog uplands)

Llyn yr Adar

A calm upland lake surrounded by grassy moorland with rocky outcrops, with the mountains of Snowdonia including Snowdon visible under a partly cloudy sky.

Yr Adar sits up under Cnicht with Conglog and Cwm Foel for company, another of the high, remote waters that make you work before you fish.

Marginal · Trout
Marabou Damsel · 8-12
A patient day, if you fancy it
Good wave on — drift country. Slow going — pick your moments and do not force it.
38% confidence
limited data

Llyn yr Adar is often best in spring through autumn.

What moved it
  • WindNW 11 km/hLight breeze
Today's fly
Marabou Damsel
Marabou Damsel8-12
Retrieve, sub-surface
Conditions on the water
Live gauge
Wind
Light breeze
NW 11 km/h
N
NW
from the north-west
Wave20 cm ripple
Water temp—
Air temp20°C
CloudOvercast
Pressure1019 hPa
Rain · recent0.0 mm

Some readings unavailable — check directly before fishing.

How to fish it · for Trout
When
June–August; best on overcast, breezy days
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

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

Bank

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

Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 5 with Pro.

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Through the year
0–3 scale · August 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 Cambrian Angling AssociationAccess varies
Remote high llyn below Cnicht holding wild brown trout only; covered by the Cambrian AA's single day ticket across the whole llyn portfolio.
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What's coming
Plan ahead
5-day outlook
Condition match
73%
Cloud50%
Wind100%
Temp60%

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

Other water nearby · 5
Llyn Cwm Corsiog
1.0 km
Brown trout
Llyn Cwm Foel
1.0 km
Brown trout
Llyn Llagi
1.0 km
Brown trout
Llynoedd Cwn
1.0 km
Brown trout
Llyn Conglog
2.0 km
Brown trout
Gallery · 2
  1. A calm upland lake surrounded by grassy moorland with rocky outcrops, with the mountains of Snowdonia including Snowdon visible under a partly cloudy sky.
    Llyn yr Adar and Snowdon
  2. Terrain map of the venue
    Terrain map
About this water

Yr Adar sits up under Cnicht with Conglog and Cwm Foel for company, another of the high, remote waters that make you work before you fish. It holds wild brown trout only, small and unstocked, in water that colours and clears with the weather rather than any human intervention. This is the end of the portfolio for anyone doing the llyns as a tour rather than picking off single waters — pair it with a couple of the nearby high lakes on a long day rather than making the walk for this one alone. The reward is as much the ground covered as the fish that come to hand.

  • Lake
  • Ordovician volcanics
Why this score
  • Wind conditions (ripple) closely match what this water fishes best in.
  • Daddy Longlegs are in their seasonal window, boosting the chance of targeted feeding.
Related guides
Scotland Playbookloch & river fishingThermal Layers & Troutreading depth and temperatureEuro Nymphingsubsurface methods
Casting instructors near here
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