Stillwater · Old Red Sandstone · Wales / Brecon Beacons (Taff Valley)

Llwyn-on Reservoir

Llwyn-on Reservoir — Reflections
Fair · Rainbow
Marabou Damsel · 8-12
Fairlive now
Reasonable summer fishing likely at Llwyn-on Reservoir
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.
54% confidence

Llwyn-on Reservoir is often best in spring through autumn.

What moved it
  • WindSW 8 km/hLight breeze
Today's fly
MD
Marabou Damsel8-12
Retrieve, sub-surface
Conditions on the water
Live gauge
Wind
Light breeze
SW 8 km/h
N
SW
from the south-west
WaveRipple
Water temp—
Air temp28°C
CloudBroken
Pressure—
Rain · recent0.0 mm

Some readings unavailable — check directly before fishing.

How to fish it · for Rainbow
When
Conditions are not ideal but fishable at Llwyn-on Reservoir. The ripple should help fish move and feed more confidently. Very warm conditions — trout have a narrower safe zone of cool, oxygen-rich water. Fish only at first light or last light, use barbless hooks, keep fish in the water during release, and stop if fish struggle to recover.
Where
Start with Marabou Damsel (8-12) — on the point. Midday in warm weather — switch to a fast-sink or Di-7 and fish boobies or blobs along the bottom. Rainbows respond to more active retrieves — try short strips between pauses.
The plan
Plan A

Start with Marabou Damsel (8-12) — on the point. Midday in warm weather — switch to a fast-sink or Di-7 and fish boobies or blobs along the bottom. Rainbows respond to more active retrieves — try short strips between pauses.

Plan B

Fish early and late, try deeper during the heat of the day with a fast-sinking line.

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

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Beyond the hatch · worth watchingambient prey

Hatch predictions

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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
Rainbow fly box
Bays & launches · 1
Llwyn-on Reservoir — day ticket via Fishing PassportAccess varies
The largest of the three Taff Valley reservoirs at 150 acres — bookable on the Fishing Passport with day-ticket bag limits of four or six fish, or a junior two-fish permit.
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What's coming
Plan ahead
5-day outlook
Condition match
69%
Cloud70%
Wind100%
Temp25%

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

Other water nearby · 5
Beacons Reservoir
7.0 km
Brown trout · Rainbow trout
Afon Cynon
9.0 km
Brown trout
Llyn Cwm Llwch
10 km
Brown trout
Talybont Reservoir
11 km
Brown trout
Bargoed Park
17 km
Brown trout · Rainbow trout
Gallery · 2
  1. Llwyn-on Reservoir — Reflections
    Reflections
  2. Terrain map of the venue
    Terrain map
Why this score
  • Wind conditions (ripple) closely match what this water fishes best in.
  • Buzzers are in their seasonal window, boosting the chance of targeted feeding.
Related guides
Big Stillwater Playbookreservoir tacticsReservoir Entomologymatching the hatchThermal Layers & Troutreading depth and temperature
Casting instructors near here
Booking & contacts