Stillwater · Ordovician Volcanics · Wales / Snowdonia (Rhyd Ddu)

Llyn y Dywarchen

Llyn y Dywarchen terrain map

The 'floating island' lake recorded by Giraldus Cambrensis in 1188 — six hectares above Rhyd Ddu, southwest of Snowdon.

Fair · Trout
Minkie · 6-10
Fairlive now
Good drifting conditions on Llyn y Dywarchen
Good wave on — drift country. A useful wave. Work the productive shore.
54% confidence

Llyn y Dywarchen is often best in spring through autumn.

What moved it
  • WindN 13 km/hGentle breeze
Today's fly
Minkie
Minkie6-10
Retrieve, sub-surface
Conditions on the water
Live gauge
Wind
Gentle breeze
N 13 km/h
N
N
from the north
Wave20 cm ripple
Water temp
Air temp13°C
CloudBroken
Pressure1021 hPa
Rain · recent0.0 mm

Some readings unavailable — check directly before fishing.

How to fish it · for Trout
When
The daddy longlegs are on. Sedge may also come into play as the day warms. The ripple is helpful — fish should move onto the feed and a slow-drifted team or single wet will cover water well.
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

Sedge should come on through the afternoon as the water warms.

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 Fishing PassportAccess varies
SGLL Society's stocked water — rainbows 1.
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What's coming
Plan ahead
5-day outlook
Condition match
74%
Cloud100%
Wind65%
Temp60%

A good match for Llyn y Dywarchen — most conditions are close to what it fishes best in.

Other water nearby · 5
About this water

The 'floating island' lake recorded by Giraldus Cambrensis in 1188 — six hectares above Rhyd Ddu, southwest of Snowdon. SGLL's stocked water, rainbows from one and three-quarter pounds up to five from the Llanrug hatchery, bank and boat fishing, fly only. Historical curiosity meets functional stocked fishery.

  • Lake
  • Ordovician volcanics
Why this score
  • Cloud cover (cloud) suits the fishery well.
  • Daddy Longlegs are in their seasonal window, boosting the chance of targeted feeding.
Related guides
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