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.

Fair · Trout
Minkie · 6-10
Fairlive now
Good drifting conditions on Llyn Cwmprysor
Good wave on — drift country. A useful wave. Work the productive shore.
55% confidence

Llyn Cwmprysor is often best in spring through autumn.

What moved it
  • WindN 20 km/hGentle breeze · Gusts to 38 km/h
Today's fly
Minkie
Minkie6-10
Retrieve, sub-surface
Conditions on the water
Estimate
Wind
Gentle breeze · Gusts to 38 km/h
N 20 km/h
N
N
from the north
Wave40 cm chop
Water temp8.6°C
Air temp11°C
CloudBroken
Pressure1017 hPa
Rain · recent0.0 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Head to
Wind driftN wind
Southern end

A northerly has held for 11 hours at much the same temperature as the 9°C water. No thermal steer either way, but the drift still stacks food against the southern end — the bank it is blowing into — so start there. This reads the upper water, though — a bottom bait at range feels it far less than a floater or a fish in the margins. Treat it as a tiebreaker between good swims rather than an override — features and angling pressure usually count for more.

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

Keep an eye on changing conditions — wind shifts and cloud breaks can trigger short feeding spells.

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 as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 4 as a supporter.

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Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Heather FlyHatch
2
2
Daddy Long LegsHatch
2
3
2
Claret DunHatch
2
3
2
Murrough (Great Red Sedge)Hatch
2
3
2

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
86%
Cloud100%
Wind65%
Temp100%

Conditions are ideal for Llyn Cwmprysor — wind, cloud and temperature all line up.

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
  • Cloud cover (cloud) suits the fishery well.
  • Temperature (cool) is in the sweet spot for autumn fishing.
  • Buzzer is in its seasonal window, boosting the chance of targeted feeding.
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