Stillwater · Acidic · Gwynedd

Glasfryn Fishing Parc

Glasfryn Fishing Parc terrain map

Glasfryn sits on acidic upland ground in Gwynedd, fished for rainbows and browns, and the acid catchment tells you most of what you need to know.

Fair · Rainbow
Coch-y-Bonddu Beetle · 10-14
Fairlive now
Evening session looks promising at Glasfryn Fishing Parc
Useful ripple, fishable wave. Worth a session if the wind holds.
54% confidence

Glasfryn Fishing Parc is often best in spring through autumn.

What moved it
  • WindS 12 km/hLight breeze
Today's fly
CY
Coch-y-Bonddu Beetle10-14
Upstream dry, on top
Conditions on the water
Live gauge
Wind
Light breeze
S 12 km/h
N
S
from the south
Wave20 cm ripple
Water temp—
Air temp23°C
CloudClear
Pressure1020 hPa
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 Glasfryn Fishing Parc. 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 Coch-y-Bonddu Beetle (10-14) — on the bob / top dropper. 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 Coch-y-Bonddu Beetle (10-14) — on the bob / top dropper. 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

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 fishing near inflows, dam walls, and weed beds. Move to find feeding fish.

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

Traditional wild-trout llyn fishing. Wet flies and dabblers stay central, with buzzer, caddis, terrestrials and occasional small fry patterns becoming important as the season warms.

What's coming
Plan ahead
5-day outlook
Condition match
66%
Cloud25%
Wind100%
Temp60%

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

Other water nearby · 5
Llyn Cwm Silyn
33 km
Brown trout · Arctic char
Llyn Cwmystradllyn
33 km
Brown trout · Rainbow trout
Llyn Nantlle
34 km
Brown trout · Sea trout
Llyn Cwm Nantcol
36 km
Brown trout · Rainbow trout
Llyn y Fedw
37 km
Brown trout
About this water

Glasfryn sits on acidic upland ground in Gwynedd, fished for rainbows and browns, and the acid catchment tells you most of what you need to know. Soft, peaty water doesn't carry the rich insect life of a limestone lake, so the trout here are more opportunist than connoisseur — which, depending on your mood, is either a relief or a challenge. Upland weather does what it likes, and the fishing follows it. A cool overcast day with a ripple is the prize; flat calm and bright sun the penance. The browns in particular have a wild streak to them, holding deeper and harder to tempt than the stocked rainbows. Bring a few attractors and a bit of stubbornness and the place gives back what you put in.

  • Fishery
  • Acidic
Why this score
  • Wind conditions (ripple) closely match what this water fishes best in.
Related guides
Small Stillwater Playbookstillwater tacticsThermal Layers & Troutreading depth and temperatureEuro Nymphingsubsurface methods
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