Stillwater · Volcanic · North Wales / Gwynedd (Snowdonia)

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
Olive Damsel · 10-12
Fairlive now
Daddy Longlegs expected on Cregennan Lakes
Good wave on — drift country. A useful wave. Work the productive shore.
55% confidence

Cregennan Lakes is often best in spring through autumn.

What moved it
  • WindNE 6 km/hLight breeze
Today's fly
Olive Damsel
Olive Damsel10-12
Retrieve, sub-surface
Conditions on the water
Live gauge
Wind
Light breeze
NE 6 km/h
N
NE
from the north-east
WaveRipple
Water temp—
Air temp11°C
CloudOvercast
Pressure1020 hPa
Rain · recent0.0 mm

Some readings unavailable — check directly before fishing.

How to fish it · for Trout
When
The sedge is on. Lake Olive 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

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

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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

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
73%
Cloud50%
Wind100%
Temp60%

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

Other water nearby · 5
Afon Eden (Welsh)
14 km
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 (ripple) closely match what this water fishes best in.
  • Sedge is in its 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