Stillwater · Mixed · Mid Wales / Carmarthenshire

Llyn Brianne

Llyn Brianne Reservoir from the western shore, open water toward the spillway with Tywi Forest on the far hillside.
Contributor photo

Llyn Brianne Reservoir

M J Roscoe - CC BY-SA 2.0

Llyn Brianne is a great upland reservoir flooded into the headwaters of mid Wales, an acid catchment of peat and rock where the water runs soft and the wild brown trout run hard.

Fair · Rainbow
Diawl Bach · 12-14
Fairlive now
Buzzer on Llyn Brianne
Useful ripple, fishable wave. Worth a session if the wind holds.
56% confidence
What moved it
  • WindSW 29 km/hModerate breeze
Today’s fly
Diawl Bach
Diawl Bach12-14
Washing-line, sub-surface
Conditions on the water
Live gauge
Wind
Moderate breeze
SW 29 km/h
N
SW
from the south-west
Wave60 cm wave
Water temp—
Air temp21°C
CloudBroken
Pressure1014 hPa
Rain · recent0.0 mm

Some readings unavailable — check directly before fishing.

How to fish it · for rainbow
When
The buzzer is on. Damsel Nymph may also come into play as the day warms.
Where
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

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 Silverhorn towards evening — this could be the best window of the day.

Boat — at anchor

Windy conditions suit anchoring in productive areas rather than open-water drifting.

Through the year
0–3 scale · June 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
Rainbow fly box
What's coming
Plan ahead
5-day outlook
Condition match
51%
Cloud70%
Wind30%
Temp60%

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

Other water nearby · 5
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Llandyfan Trout Fishery
22 km
Rainbow trout · Brown trout
Elan Valley (Rhayader)
23 km
Brown trout · Rainbow trout
Llyn y Fan Fach
24 km
Brown trout
Gallery · 5
  1. Llyn Brianne Reservoir from the western shore, open water toward the spillway with Tywi Forest on the far hillside.
    Llyn Brianne Reservoir
  2. View across the Afon Tywi arm of Llyn Brianne toward the dense Tywi Forest on the far shore.
    Llyn Brianne — the Tywi arm
  3. Broad landscape view of Llyn Brianne Reservoir looking north, open water in the foreground and moorland and woodland rising around.
    Llyn Brianne Reservoir
  4. Wide panoramic view of Llyn Brianne reservoir on a clear day, forested hills descending to the water.
    Llyn Brianne panorama
  5. Terrain map of the venue
    Terrain map
About this water

Llyn Brianne is a great upland reservoir flooded into the headwaters of mid Wales, an acid catchment of peat and rock where the water runs soft and the wild brown trout run hard. This is not a manicured day-ticket pond. It's a big, weather-beaten upland water where the fish are mostly small, dark, beautifully marked and entirely uninterested in being caught easily. The browns are wild and earn their living in lean water, with stocked fish added over the years to the mix. The reward isn't size, it's the place — bare hills, drifting cloud, and trout that have never seen anything soft in their lives. Fish a team of traditional Welsh wets across the wave from drifting boat or rocky bank, and on the right blustery day the offers come fast and savage. On the wrong day the wind simply wins.

  • Lake
  • Mixed
Why this score
  • Wind conditions (windy) are not ideal for this water.
  • Buzzer is in its seasonal window, boosting the chance of targeted feeding.
Related guides
Thermal Layers & Troutreading depth and temperatureEuro Nymphingsubsurface methods
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