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Fishing Llyn Erddyn: what the data says
23-acre lake near Gwynedd. The lake tops out around 29 ft. Depth here is modeled from the true shoreline and max depth rather than surveyed; use it to plan, not to navigate. The season-by-season read for each species follows, from the map's own numbers.
Traced from the shoreline, Llyn Erddyn runs 23 acres with 0.8 miles of edge. The basin is a simple one (shoreline index 1.1) — close to a bowl, so the structure on the chart matters more than the bank. Roughly 51% of the water is 15 ft or less as modeled, the band where the food chain lives.
Brown Trout fishing at Llyn Erddyn
Early season brown trout use the shallows, holding in 3 to 25 ft. Expect a summer slide to 9 to 29 ft, then a winter hold in 4 to 29 ft. Put Break off the point first on the milk run — a drop-off near 13 ft that grades prime for summer. In summer the feeding windows fall in after dark and early morning. Tie on a spoon at the thermocline or a deep stickbait (night) and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 25 ft | dawn & dusk | Main-lake point (8 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 9 to 29 ft | night & dawn | Break off the point (13 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 5 to 29 ft | dusk & dawn | Main-lake point (8 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 4 to 29 ft | dawn | Break off the point (13 ft) | Jigging spoon, Small stickbait (slow) |
European Perch fishing at Llyn Erddyn
Spring puts european perch in skinny water — 3 to 12 ft is the zone. As the season builds they drop to 8 to 28 ft, wintering in 9 to 29 ft. Fall european perch concentrate at Deep basin, a prime-rated deep basin around 25 ft. Warm-month bites cluster around early morning. A drop-shot micro plastics or a small crankbait (perch pattern) covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | open water | Small jig + curly tail, Inline spinner #1-2 |
| Summer | 8 to 28 ft | dawn | Deep basin (25 ft) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Fall | 9 to 29 ft | midday | Deep basin (25 ft) | Jigging spoon (small), Drop-shot on deep flats |
| Winter | 9 to 29 ft | midday & dawn | Deep basin (25 ft) | Tungsten jig + maggots, Small balance jig |
Northern Pike fishing at Llyn Erddyn
Spring puts northern pike in skinny water — 2 to 8 ft is the zone. Warm water sends them out to 8 to 20 ft; cold water stacks them in 5 to 15 ft. Break off the point is the standout, a drop-off at roughly 13 ft, rated prime for fall northern pike. Plan around early morning and the evening in the warm months. A bucktail or a weedless spoon over cabbage covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | open water | #5 inline spinner, Spoon (red/white) |
| Summer | 8 to 20 ft | dawn & dusk | Break off the point (13 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Break off the point (13 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Main-lake point (8 ft) | Tip-ups, Large jigging spoon |
Notable structure
- Deep basin: deep basin, around 25 ft
- Break off the point: drop-off, around 13 ft
- Main-lake point: point, around 8 ft
Common questions
How deep is Llyn Erddyn?
Llyn Erddyn is about 29 ft (9 m) deep at its deepest point. The contours here are modeled from the water's real shape and maximum depth, so treat them as a rough guide.
What fish are in Llyn Erddyn?
Anglers target northern pike, european perch, brown trout on Llyn Erddyn. This isn't a survey of the water — none is published for it — but an informed estimate from the species common to the region, narrowed by this water's depth, size and each species' range.
Where is the best fishing spot on Llyn Erddyn?
Deep basin is the top-rated area: a deep basin in about 25 ft of water that rates prime for european perch in fall. Scroll up to the map for the complete spot list by species and season.
When is the best time to fish Llyn Erddyn?
For brown trout, the summer bite is best in after dark and early morning. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Nearby waters
Llyn Bodlyn 2 mi · Llyn Dulyn 2 mi · Llyn Cwm-mynach 3 mi · Llyn Hywel 3 mi · Llyn y Bi 4 mi · Gloyw Lyn 5 mi · Llyn Cwm Bychan 6 mi · Llyn Gwernan 6 mi · Llyn y Gadair 7 mi · Llyn Cau 8 mi · Llyn Tecwyn Isaf 9 mi · Tal-y-llyn Lake 9 mi
See how Llyn Erddyn stacks up: best northern pike lakes in United Kingdom · best european perch lakes in United Kingdom · best brown trout lakes in United Kingdom
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