Stillwater · Silurian Mudstone Shale · Wales / Cambrian Mountains (Elan Valley uplands, Rhayader)

Llynoedd Cerrig Llwyddion

Llynoedd Cerrig Llwyddion terrain map
Terrain map

Cerrig Llwyddion is really two lakes for the price of one ticket — an upper pool that holds a sparse scattering of small wild browns, more a curiosity than a destination, and a lower lake with rather better sport, brown trout running up to a pound for anyone patient enough to work it properly.

Marginal · Trout
Diawl Bach · 12-14
A patient day, if you fancy it
Water temperature is the limiting factor today, not the wave. Fish dawn or dusk if you go at all, and handle everything with extra care.
42% confidence
limited data
What moved it
  • WindS 7 km/hLight breeze
Today’s fly
Diawl Bach
Diawl Bach12-14
Washing-line, sub-surface
Conditions on the water
Live gauge
Wind
Light breeze
S 7 km/h
N
S
from the south
WaveRipple
Water temp
Air temp30°C
CloudClear
Pressure1019 hPa
Rain · recent0.0 mm

Some readings unavailable — check directly before fishing.

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. Keep a sedge-style dry or emerger on a short leader for the evening rise.
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. 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

Watch for Sedge towards evening — this could be the best window of the day.

Boat — drift

A gentle ripple is ideal for drifting — broadside drift covering the wind lanes should be productive.

Through the year
0–3 scale · July 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
Bays & launches · 1
Day ticket via Rhayader and Elan Valley AA (covers Claerwen)Access varies
Two small remote lakes above the Elan valley — sparse upper pool, better lower lake with browns to 1lb.
What's coming
Plan ahead
5-day outlook
Condition match
55%
Cloud25%
Wind100%
Temp25%

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

Other water nearby · 5
About this water

Cerrig Llwyddion is really two lakes for the price of one ticket — an upper pool that holds a sparse scattering of small wild browns, more a curiosity than a destination, and a lower lake with rather better sport, brown trout running up to a pound for anyone patient enough to work it properly. Both come under the same Claerwen-inclusive permit as the rest of the Rhayader club's upland water. The sensible plan is to treat the upper as a look-and-learn stop on the walk in and spend your actual fishing time on the lower. Remote, quiet, and entirely without pretension — which describes most of this stretch of moor rather well.

  • Lake
  • Silurian mudstone shale
Why this score
  • Wind conditions (ripple) closely match what this water fishes best in.
  • High temperatures may push fish deeper and reduce surface activity.
  • Damsel Nymph is in its seasonal window, boosting the chance of targeted feeding.
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