Stillwater · Ordovician Volcanics · Wales / Snowdonia (Nant Ffrancon, Ogwen catchment)

Llyn Ogwen

Wide view across Llyn Ogwen towards Snowdonia mountains, with waterfowl standing on a rock in the lake and green hillsides on both shores.
Marginal · Trout
Marabou Damsel · 8-12
A patient day, if you fancy it
Water temperature is the limiting factor today, not the wave. Fish dawn or dusk if you go at all, and handle everything with extra care.
39% confidence
limited data

Llyn Ogwen is often best in spring through autumn.

What moved it
  • WindSW 12 km/hLight breeze
Today's fly
MD
Marabou Damsel8-12
Retrieve, sub-surface
Conditions on the water
Live gauge
Wind
Light breeze
SW 12 km/h
N
SW
from the south-west
Wave20 cm ripple
Water temp—
Air temp25°C
CloudBroken
Pressure1021 hPa
Rain · recent0.0 mm

Some readings unavailable — check directly before fishing.

How to fish it · for Trout
When
The damsel is on. Buzzers 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

Watch for Sedge towards evening — this could be the best window of the day.

Bank

Bank-only venue. Fish from accessible margins, points, weed edges, and inflows.

Sub-surface · on the nymphunder the surface

Hatch predictions

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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 Ogwen Valley Angling AssociationAccess varies
Largest and most accessible of OVAA's four waters, roadside along the A5 in Nant Ffrancon.
What's coming
Plan ahead
5-day outlook
Condition match
77%
Cloud100%
Wind100%
Temp25%

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

Other water nearby · 5
Llyn Bochlwyd
1.0 km
Brown trout
Ffynnon Lloer
2.0 km
Brown trout
Llyn Idwal
2.0 km
Brown trout
Llynnau Mymbyr
5.0 km
Brown trout
Llyn Dulyn
7.0 km
Brown trout · Arctic char
Gallery · 2
  1. Wide view across Llyn Ogwen towards Snowdonia mountains, with waterfowl standing on a rock in the lake and green hillsides on both shores.
    Llyn Ogwen
  2. Terrain map of the venue
    Terrain map
Why this score
  • Wind conditions (ripple) closely match what this water fishes best in.
  • Cloud cover (cloud) suits the fishery well.
  • damsel is in its seasonal window, boosting the chance of targeted feeding.
Related guides
Scotland Playbookloch & river fishingThermal Layers & Troutreading depth and temperatureEuro Nymphingsubsurface methods
Casting instructors near here
Booking & contacts