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.
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. In the calm, a single dry fly or a slowly-fished nymph tends to out-fish an active retrieve.
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. In the calm, a single dry fly or a slowly-fished nymph tends to out-fish an active retrieve.

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
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