Stillwater · Volcanic · North Wales / Gwynedd (Snowdonia), GB-WLS

Cregennan Lakes

Cregennan Lakes — Cregennan Lakes and Tyrau Mawr

Two small natural lakes owned by the National Trust, set at the foot of Cadair Idris in the southern Snowdonia National Park near Dolgellau.

Fair · Trout
Booby · 10-12
Fairlive now
Good drifting conditions on Cregennan Lakes
Useful ripple, fishable wave. Worth a session if the wind holds.
58% confidence

Cregennan Lakes is often best in spring through autumn.

What moved it
  • WindSE 33 km/hFresh breeze
Today's fly
Booby
Booby10-12
Washing-line, sub-surface
Conditions on the water
Estimate
Wind
Fresh breeze
SE 33 km/h
N
SE
from the south-east
Wave60 cm wave
Water temp18.6°C
Air temp20°C
CloudOvercast
Pressure1005 hPa
Rain · recent0.0 mm

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

How to fish it · for Trout
When
The daddy longlegs are on. Buzzer may also come into play as the day warms. The breeze will be blowing terrestrial insects onto the water — check the wind lanes and downwind margins for rising fish.
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 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 · 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

Boat-friendly, competition-influenced, often wind-driven, with strong top-of-water periods but also classic deep searching and washing-line phases.

What's coming
Plan ahead
5-day outlook
Condition match
45%
Cloud50%
Wind30%
Temp60%

Conditions are away from Cregennan Lakes's sweet spot — it usually fishes best in ripple wind with cloud skies.

Fishing better nearby · 5
Afon Eden (Welsh)
14 km
88
Brown trout
Llyn Cwm Nantcol
17 km
Brown trout · Rainbow trout
Llyn Conach
19 km
Brown trout
Llyn Dwfn
20 km
Brown trout
Llyn Penrhaeadr
20 km
Brown trout · Perch
Gallery · 2
  1. Cregennan Lakes — Cregennan Lakes and Tyrau Mawr
    Cregennan Lakes and Tyrau Mawr
  2. Terrain map of the venue
    Terrain map
About this water

Two small natural lakes owned by the National Trust, set at the foot of Cadair Idris in the southern Snowdonia National Park near Dolgellau. The setting — open mountain lake, wide sky, and the presence of the mountain — is as much the point as the fishing. Wild and stocked trout in low-nutrient upland water, typical of the Ordovician volcanic and mudstone geology of Cadair Idris. The car park is reached via a narrow road from Arthog; access and stocking arrangements vary by season.

  • Lake
  • Volcanic
Why this score
  • Wind conditions (windy) are not ideal for this water.
  • 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
Booking & contacts
Boards & regulators