Stillwater · Limestone · North Wales / Powys

Lake Vyrnwy

Broad view of Lake Vyrnwy reservoir with calm water, wooded hillsides, and the shoreline stretching into the distance.
Fair · Rainbow
Olive Damsel · 10-12
Fairlive now
Evening session looks promising at Lake Vyrnwy
Good wave on — drift country. A useful wave. Work the productive shore.
62% confidence

Lake Vyrnwy is often best in spring through autumn.

What moved it
  • WindN 10 km/hLight breeze
Today's fly
Olive Damsel
Olive Damsel10-12
Retrieve, sub-surface
Conditions on the water
Live gauge
Wind
Light breeze
N 10 km/h
N
N
from the north
Wave20 cm ripple
Water temp—
Air temp14°C
CloudOvercast
Pressure1020 hPa
Rain · recent0.0 mm

Some readings unavailable — check directly before fishing.

How to fish it · for Rainbow
When
The sedge is on at Lake Vyrnwy. The ripple should help fish move and feed more confidently. Evening can bring a surface rise — have a dry fly or emerger ready.
Where
Start with Olive Damsel (10-12) — 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 Olive Damsel (10-12) — 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 surface work dries up, try a diawl bach or hare's ear on the point and skate a sedge pattern on the bob at last light.

Watch for

Evening tends to be the best period in summer — stay late if you can for a sedge or spinner fall.

Either bank or boat

Good ripple suits both bank and boat. Bank: work inflows, dam walls, and points. Boat: broadside drift covering wind lanes.

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 5 with Pro.

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Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
2
1
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
What's coming
Plan ahead
5-day outlook
Condition match
85%
Cloud50%
Wind100%
Temp100%

Conditions are ideal for Lake Vyrnwy — wind, cloud and temperature all line up.

Other water nearby · 5
Llyn Coch Hwyad
12 km
Brown trout
Bala Lake (Llyn Tegid)
15 km
Brown trout · Pike · Perch
Llyn Gwyddior
15 km
Brown trout
Llyn Cwmprysor
27 km
Brown trout
Afon Eden (Welsh)
28 km
Brown trout
Gallery · 6
  1. Broad view of Lake Vyrnwy reservoir with calm water, wooded hillsides, and the shoreline stretching into the distance.
    Lake Vyrnwy reservoir
  2. The Victorian Gothic straining tower and approach bridge standing in Lake Vyrnwy, reservoir water surrounding it.
    Lake Vyrnwy straining tower
  3. The stone dam wall of Lake Vyrnwy with the reservoir impounded behind it and wooded hillsides on the far bank.
    Lake Vyrnwy dam and reservoir
  4. Elevated panoramic view over Lake Vyrnwy showing the dam, the straining tower, and the full length of the reservoir.
    Lake Vyrnwy from Craig garth-bwlch
  5. Drone aerial photograph over Lake Vyrnwy reservoir in autumn, the open water ringed by forested hillsides.
    Lake Vyrnwy from the air
  6. Terrain map of the venue
    Terrain map
Water quality (WFD)
  • Ecology: Moderate
  • Chemical: Unknown
What this classification means

NRW WFD Cycle 3 (lake) — Llyn Efyrnwy / Lake Vyrnwy: Moderate ecological status. Re-tagged 2026-06-18 from a feeder-river reach to the reservoir's own lake waterbody. Source: NRW DataMapWales WFD Cycle 3 classification layer.

NRW (Wales) · GB30935568

Why this score
  • Wind conditions (ripple) closely match what this water fishes best in.
  • Temperature (cool) is in the sweet spot for summer fishing.
  • Sedge is in its seasonal window, boosting the chance of targeted feeding.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 15 March → 5 October
Related guides
Big Stillwater Playbookreservoir tacticsReservoir Entomologymatching the hatchThermal Layers & Troutreading depth and temperature
Casting instructors near here
Booking & contacts
Clubs & associations