Stillwater · Old Red Sandstone · Wales / Brecon Beacons (Taff Valley), GB-WLS

Llwyn-on Reservoir

Llwyn-on Reservoir — Reflections

Llwyn-on is the largest of the three Taff reservoirs at a hundred and fifty acres and the most accommodating — fly, spinner or worm all permitted, which makes it a favourite with local anglers and a good water to bring a beginner to.

Good · Rainbow
Minkie · 6-10
Goodlive now
Reasonable autumn fishing likely at Llwyn-on Reservoir
Useful ripple, fishable wave. Fishable ripple — drift the productive shore.
69% confidence

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

What moved it
  • WindSW 21 km/hModerate breeze · Gusts to 39 km/h
Today's fly
Minkie
Minkie6-10
Retrieve, sub-surface
Conditions on the water
Estimate
Wind
Moderate breeze · Gusts to 39 km/h
SW 21 km/h
N
SW
from the south-west
Wave40 cm chop
Water temp13.2°C
Air temp13°C
CloudOvercast
Pressure1027 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 Rainbow
When
The buzzer is on at Llwyn-on Reservoir. The ripple should help fish move and feed more confidently.
Where
Start with Minkie (6-10) — on the point. Rainbows respond to more active retrieves — try short strips between pauses. If that does not produce, switch depth or speed before changing the pattern entirely.
The plan
Plan A

Start with Minkie (6-10) — on the point. Rainbows respond to more active retrieves — try short strips between pauses. If that does not produce, switch depth or speed before changing the pattern entirely.

Plan B

If the main plan stalls, drop to a size 14–16 midge — switch to a washing-line or suspender rig and change drift line before you change food group.

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 3 guilds as a supporter.

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14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 5 as a supporter.

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14-day free trial. Cancel anytime.

Through the year
0–3 scale · October 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
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.
Visit official site ↗
What's coming
Plan ahead
5-day outlook
Condition match
59%
Cloud50%
Wind65%
Temp60%

A reasonable day here, though cloud 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
About this water

Llwyn-on is the largest of the three Taff reservoirs at a hundred and fifty acres and the most accommodating — fly, spinner or worm all permitted, which makes it a favourite with local anglers and a good water to bring a beginner to. Stocked with rainbows and browns; the bag-limit permits run four or six fish. Bookable by day-ticket through the Fishing Passport. The Taff valley setting is broad and pastoral rather than dramatic, but the fish are honest and the access is straightforward.

  • Reservoir
  • Old red sandstone
Why this score
  • Buzzer is in its seasonal window, boosting the chance of targeted feeding.
  • Reservoirs of this kind fish well at this time of year.
Related guides
Big Stillwater Playbookreservoir tacticsReservoir Entomologymatching the hatchThermal Layers & Troutreading depth and temperature
Casting instructors near here
Booking & contacts
Boards & regulators