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

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
Fairlive now
Good drifting conditions on Llyn Gwyn
Good wave on — drift country. A useful wave. Work the productive shore.
63% confidence

Llyn Gwyn is often best in spring through autumn.

What moved it
  • WindN 10 km/hLight breeze
Today's fly
Minkie
Minkie6-10
Retrieve, sub-surface
Conditions on the water
Live gauge
Wind
Light breeze
N 10 km/h
N
N
from the north
Wave20 cm ripple
Water temp—
Air temp14°C
CloudBroken
Pressure1020 hPa
Rain · recent0.0 mm

Some readings unavailable — check directly before fishing.

How to fish it · for Trout
When
The daddy longlegs are on. Sedge 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

Top nymph shown — see all 2 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
Daphnia SwarmHatch
2
3
3
3
2
Daddy Long LegsHatch
2
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.
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What's coming
Plan ahead
5-day outlook
Condition match
91%
Cloud70%
Wind100%
Temp100%

Conditions are ideal for Llyn Gwyn — wind, cloud and temperature all line up.

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
  • Wind conditions (ripple) closely match what this water fishes best in.
  • Temperature (cool) is in the sweet spot for summer fishing.
  • Daddy Longlegs are in their 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