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.

Ogwen is the big one — the fourth and largest of the Ogwen Valley Angling Association's waters, and the only one you can practically fish straight off the road, since the A5 runs along its shore the whole length of the valley.

Fair · Trout
Minkie · 6-10
Fairlive now
Sedge evening rise expected on Llyn Ogwen
Good wave on — drift country. A useful wave. Work the productive shore.
64% confidence

Llyn Ogwen is often best in spring through autumn.

What moved it
  • WindN 10 km/hLight breeze
Today's fly
Minkie
Minkie6-10
Retrieve, sub-surface
Conditions on the water
Estimate
Wind
Light breeze
N 10 km/h
N
N
from the north
Wave20 cm ripple
Water temp
Air temp11°C
CloudBroken
Pressure1026 hPa
Rain · recent0.0 mm

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

How to fish it · for Trout
When
The sedge is on. Daddy Longlegs 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. Keep a sedge-style dry or emerger on a short leader for the evening rise. In the ripple, a bushy searching dry (Hopper, Shipman's, Elk Hair Caddis) outperforms flush emergers — it stays visible and holds the surface tension.
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. Keep a sedge-style dry or emerger on a short leader for the evening rise. In the ripple, a bushy searching dry (Hopper, Shipman's, Elk Hair Caddis) outperforms flush emergers — it stays visible and holds the surface tension.

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 4 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
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 Ogwen Valley Angling AssociationAccess varies
Largest and most accessible of OVAA's four waters, roadside along the A5 in Nant Ffrancon.
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What's coming
Plan ahead
5-day outlook
Condition match
79%
Cloud70%
Wind100%
Temp60%

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

Other water nearby · 5
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
About this water

Ogwen is the big one — the fourth and largest of the Ogwen Valley Angling Association's waters, and the only one you can practically fish straight off the road, since the A5 runs along its shore the whole length of the valley. That roadside convenience means more casual traffic than Ffynnon Lloer, Bochlwyd or Idwal tucked up in their cwms above, but it also buys a longer season — open into late November, a full two months past the club's high-cwm waters, which close for the winter at the end of September. Wild browns and stocked rainbows both swim here, and on a grey Snowdonia afternoon with Tryfan looming over the far bank, it's hard to think of anywhere in Wales that looks more like a mountain lake is supposed to look.

  • Lake
  • Ordovician volcanics
Why this score
  • Wind conditions (ripple) closely match what this water fishes best in.
  • Sedge is in its seasonal window, boosting the chance of targeted feeding.
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