Wild brown trout in dramatic mountain scenery. Access by 2-mile walk from Storey Arms. Classic Beacons hill llyn — small, wild fish in clear water. Traditional wet flies and dabblers.
- Lake
- Sandstone
Head to
Wind driftS wind
Southern end
A southerly has held for 14 hours, running colder than the water (2°C air against 6°C water). The end it blows into is taking that chilled surface water, so try the sheltered southern end instead — off the back of the wind, where the undertow returns food along the bottom. That chill sits in the top of the water, though, and the bed is slower to feel it — on a bottom bait it is the undertow, not the temperature, that puts you at this end. 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
June to August
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
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 3 as a supporter.
Start free trial14-day free trial. Cancel anytime.
Through the year
0–3 scale · November highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Heather FlyHatch
2
2
Daddy Long LegsHatch
2
3
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.
Buzzer team todayfor the conditions now
Point#10
Bloodworm
Not in this water's box
How to fish it
Slow-sink line · slow figure-of-eight, pausing to let the flies hang
Fly recommendations
Point fly shown — supporters see the whole team, sizes and why.
Start free trial14-day free trial. Cancel anytime.
Ranked for today
Trout fly box
More straightforward stocked-water behaviour than the upland competition reservoirs, with stronger early-season lure and booby bias but still good natural-fly periods.
What's coming
Plan ahead
5-day outlook
Condition match
54%
Cloud70%
Wind65%
Temp25%
A reasonable day here, though temperature isn't quite in the sweet spot.
Other water nearby · 5
Gallery · 2
Terrain map
About this water
Why this score
- winter conditions with overcast skies and calm wind.
Directions
Seasons & zones
- Trout 3 March → 30 September
Related guides
Casting instructors near here
Booking & contacts
Llyn Cwm Llwch
Glacial corrie llyn in the Brecon Beacons below Corn Du.
Head to
Wind driftS wind
Southern end
A southerly has held for 14 hours, running colder than the water (2°C air against 6°C water). The end it blows into is taking that chilled surface water, so try the sheltered southern end instead — off the back of the wind, where the undertow returns food along the bottom. That chill sits in the top of the water, though, and the bed is slower to feel it — on a bottom bait it is the undertow, not the temperature, that puts you at this end. 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
June to August
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
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.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 3 as a supporter.
Start free trial14-day free trial. Cancel anytime.
Through the year
0–3 scale · November highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Heather FlyHatch
2
2
Daddy Long LegsHatch
2
3
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.
Buzzer team todayfor the conditions now
Point#10
Bloodworm
Not in this water's box
How to fish it
Slow-sink line · slow figure-of-eight, pausing to let the flies hang
Fly recommendations
Point fly shown — supporters see the whole team, sizes and why.
Start free trial14-day free trial. Cancel anytime.
Ranked for today
Trout fly box
More straightforward stocked-water behaviour than the upland competition reservoirs, with stronger early-season lure and booby bias but still good natural-fly periods.
What's coming
Plan ahead
5-day outlook
Condition match
54%
Cloud70%
Wind65%
Temp25%
A reasonable day here, though temperature isn't quite in the sweet spot.
Other water nearby · 5
Gallery · 2
Terrain map
About this water
Wild brown trout in dramatic mountain scenery. Access by 2-mile walk from Storey Arms. Classic Beacons hill llyn — small, wild fish in clear water. Traditional wet flies and dabblers.
- Lake
- Sandstone
Why this score
- winter conditions with overcast skies and calm wind.
Directions
Seasons & zones
- Trout 3 March → 30 September
Related guides
Casting instructors near here
Booking & contacts
At a glance
Llyn Cwm Llwch is an upland natural lake in Powys / Brecon Beacons, Wales. Its recorded elevation is about 580 m above sea level and the catchment geology is sandstone. The species listed for this water is brown trout. The trout season is recorded as running from 3 March to 30 September. Best window recorded for anglers: June to August. Core methods listed: traditional wet fly; dabbler; terrestrials. Nearby waters in our listings include Beacons Reservoir at 4.0 km, Llwyn-on Reservoir at 10 km and Talybont Reservoir at 10 km.