Stillwater · Silurian Mudstone Shale · Wales / Mid-Wales (Wye catchment, near Rhayader), GB-WLS

Llyn Gwyn

Llyn Gwyn, a still lowland fishing lake near Rhayader, seen across rough grassland and bracken with a lone tree on the far bank.

Gwyn runs backwards from everything else in this piece — it's the club's own water, owned outright rather than leased, and it opens on the eighteenth of October and closes at the end of June, shut through July, August and September while the rest of upland Wales is in full swing.

Fair · Trout
Minkie · 6-10
A respectable few hours, if you choose your moments
Glassy and bright — hard work without a breeze. Hard work without breeze. Look for the dimples.
48% confidence
limited data

Llyn Gwyn is often best in spring through autumn.

What moved it
  • WindW 3 km/hCalm
Today's fly
Minkie
Minkie6-10
Retrieve, sub-surface
Conditions on the water
Estimate
Wind
Calm
W 3 km/h
N
W
from the west
WaveFlat calm
Water temp—
Air temp14°C
CloudClear
Pressure1024 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 buzzer is on. Daddy Longlegs may also come into play as the day warms. Calm conditions may limit drift fishing — consider buzzers or dry fly if fish are rising.
Where
With limited drift, anchor or fish static from sheltered positions. Work a bushy searching pattern on the bob and drop a contrasting nymph on the point. Calm evenings are perfect for individual dry fly work — target rising fish. Keep a sedge-style dry or emerger on a short leader for the evening rise.
The plan
Plan A

With limited drift, anchor or fish static from sheltered positions. Work a bushy searching pattern on the bob and drop a contrasting nymph on the point. Calm evenings are perfect for individual dry fly work — target rising fish. 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

Buzzer may strengthen through the middle of the day as conditions warm.

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 4 guilds with Pro.

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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
Reservoir BuzzerHatch
2
3
3
3
3
3
2
Daphnia SwarmHatch
2
3
3
3
2
Lake OliveHatch
2
3
3
3
3
3
2
Silverhorns & LonghornsHatch
1
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 Rhayader and Elan Valley AA — SEASONAL, closed Jul–SepAccess varies
Club-owned mixed fishery near Rhayader — stocked rainbow/blue/golden trout, wild browns and carp.
Visit official site ↗
What's coming
Plan ahead
5-day outlook
Condition match
64%
Cloud25%
Wind65%
Temp100%

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

Other water nearby · 5
Elan Valley (Rhayader)
10 km
Brown trout · Rainbow trout
Llyn Carw
16 km
Brown trout
Llynoedd Cerrig Llwyddion
18 km
Brown trout
Llyn Gynon
21 km
Brown trout
Llyn Egnant
22 km
Brown trout
Gallery · 2
  1. Llyn Gwyn, a still lowland fishing lake near Rhayader, seen across rough grassland and bracken with a lone tree on the far bank.
    Llyn Gwyn
  2. Terrain map of the venue
    Terrain map
About this water

Gwyn runs backwards from everything else in this piece — it's the club's own water, owned outright rather than leased, and it opens on the eighteenth of October and closes at the end of June, shut through July, August and September while the rest of upland Wales is in full swing. That inversion makes it a genuine autumn-to-spring fishery: stocked rainbows, with a scatter of blue and golden colour-variants among them, wild browns holding their own in the mix, and carp for anyone who wants to put the fly rod down and try something slower. It's the most heavily managed of the Rhayader club's lakes and the most varied. Just don't turn up in August expecting it to be open — it won't be.

  • Lake
  • Silurian mudstone shale
Why this score
  • Temperature (cool) is in the sweet spot for summer fishing.
  • Buzzer is in its seasonal window, boosting the chance of targeted feeding.
Related guides
Small Stillwater Playbookstillwater tacticsThermal Layers & Troutreading depth and temperatureEuro Nymphingsubsurface methods
Casting instructors near here
Booking & contacts