Stillwater · Ordovician Volcanics · Wales / Snowdonia (Bala area, Prysor catchment)

Llyn Cwmprysor

Blue upland lake fringed by a fenced bank of grass and shrubs, with forested hills and a rounded mountain summit in the background under a partly cloudy sky.

Cwmprysor is Bala and District's one small stillwater beyond the river beats and Llyn Tegid itself — an afterthought in the club's book, geographically, but not without its own quiet appeal.

Marginal · Trout
Marabou Damsel · 8-12
A patient day, if you fancy it
Good wave on — drift country. Slow going — pick your moments and do not force it.
43% confidence
limited data

Llyn Cwmprysor is often best in spring through autumn.

What moved it
  • WindN 14 km/hGentle breeze
Today's fly
Marabou Damsel
Marabou Damsel8-12
Retrieve, sub-surface
Conditions on the water
Live gauge
Wind
Gentle breeze
N 14 km/h
N
N
from the north
Wave20 cm ripple
Water temp
Air temp19°C
CloudOvercast
Pressure1019 hPa
Rain · recent0.0 mm

Some readings unavailable — check directly before fishing.

How to fish it · for Trout
When
May–September; evenings best
Where
Set up a broadside drift and cover the water systematically. Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
The plan
Plan A

Set up a broadside drift and cover the water systematically. Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.

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

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

Top nymph shown — see all 2 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
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
Trout fly box
Bays & launches · 1
Day ticket via Bala and District AAAccess varies
Small, unstocked wild-brown stillwater beyond the club's river beats and Llyn Tegid — quiet alternative when Tegid is busy.
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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
Gallery · 2
  1. Blue upland lake fringed by a fenced bank of grass and shrubs, with forested hills and a rounded mountain summit in the background under a partly cloudy sky.
    Llyn Tryweryn
  2. Terrain map of the venue
    Terrain map
About this water

Cwmprysor is Bala and District's one small stillwater beyond the river beats and Llyn Tegid itself — an afterthought in the club's book, geographically, but not without its own quiet appeal. It holds wild brown trout in modest numbers, the kind of water you'd fish on a day when Tegid's too bright or too busy and a smaller, more intimate lake sounds better. There's little to say about it beyond the essentials: no stocking, no boat, no crowd, a short walk to reach it, and browns that behave like browns do on hill water everywhere — sporadic, a little suspicious, occasionally generous. It rounds out the association's offer rather than headlining it, and that's fine.

  • Lake
  • Ordovician volcanics
Why this score
  • Sedge is in its seasonal window, boosting the chance of targeted feeding.
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