Stillwater · Ordovician Volcanics · Wales / Snowdonia (Blaenau Ffestiniog uplands), GB-WLS

Llynnoedd Gamallt

Upland lake (Llyn Gamallt Fawr) in Snowdonia with a rocky crag rising behind the far shore.

Gamallt Fawr and Bach are two lakes joined at the hip and, by the club's own reckoning, the jewels of the whole portfolio — a reputation the stock actually backs up.

Fair · Trout
Minkie · 6-10
Fairlive now
Good drifting conditions on Llynnoedd Gamallt
Good wave on — drift country. A useful wave. Work the productive shore.
55% confidence

Llynnoedd Gamallt is often best in spring through autumn.

What moved it
  • WindNE 12 km/hGentle breeze · Gusts to 34 km/h
Today's fly
Minkie
Minkie6-10
Retrieve, sub-surface
Conditions on the water
Estimate
Wind
Gentle breeze · Gusts to 34 km/h
NE 12 km/h
N
NE
from the north-east
Wave20 cm ripple
Water temp8.4°C
Air temp10°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 driftNE wind
South-western end

A northeasterly has held for 7 hours, running warmer than the water (10°C air against 8°C water). Expect fish at the south-western 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
Late April–June; evening rises through summer
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

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 2 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 4 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 Cambrian Angling AssociationAccess varies
Two linked lakes (Fawr and Bach) regarded as the jewels of the Cambrian AA portfolio, with a strong wild brown trout stock; covered by the club's single day ticket across the whole llyn portfolio.
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What's coming
Plan ahead
5-day outlook
Condition match
71%
Cloud50%
Wind65%
Temp100%

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

Other water nearby · 5
Llyn Dubach y Bont
2.0 km
Brown trout
Llyn Morwynion
2.0 km
Brown trout · Rainbow trout
Llyn Manod
3.0 km
Brown trout
Llyn Dubach
3.0 km
Brown trout
Llynoedd Barlwyd
6.0 km
Brown trout
Gallery · 2
  1. Upland lake (Llyn Gamallt Fawr) in Snowdonia with a rocky crag rising behind the far shore.
    The shoreline of the eastern Llyn Gamallt
  2. Terrain map of the venue
    Terrain map
About this water

Gamallt Fawr and Bach are two lakes joined at the hip and, by the club's own reckoning, the jewels of the whole portfolio — a reputation the stock actually backs up. It's the strongest water in this book by most accounts, and Cambrian AA protect it accordingly with a three-fish bag limit, an unusual restriction for a portfolio otherwise run on fairly relaxed terms. Fish the linking narrows between the two pools when you can, and don't be surprised if this ends up the water you keep coming back to. Premium reputations get earned around here, not handed out, and Gamallt has clearly earned this one.

  • Lake
  • Ordovician volcanics
Why this score
  • Temperature (cool) is in the sweet spot for autumn fishing.
  • Buzzer 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
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