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23-acre lake near Gwynedd. The lake tops out around 29 ft. The depth picture is modeled, anchored to the true shoreline and the water's published max depth — a scouting aid, never a chart to run a boat by. Species by species, here's what the data says the year looks like.
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. The shallow band under 15 ft claims about 51% of the surface on the model — that's where the groceries are. The basin spans about 0.3 mi end to end and 0.2 mi across at its widest. You'll find it in Gwynedd. The nearest mapped water is Llyn Bodlyn, 2 mi to the northeast.
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.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| 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 chart-limited; documented 25 to 60 ft | night & dawn | Break off the point (13 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 5 to 29 ft chart-limited; documented 5 to 30 ft | dusk & dawn | Main-lake point (8 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 4 to 29 ft chart-limited; documented 5 to 35 ft | dawn | Break off the point (13 ft) | Jigging spoon, Small stickbait (slow) |
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.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Break off the point (13 ft) | 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 chart-limited; documented 10 to 33 ft | midday | Deep basin (25 ft) | Jigging spoon (small), Drop-shot on deep flats |
| Winter | 9 to 29 ft chart-limited; documented 12 to 33 ft | midday & dawn | Deep basin (25 ft) | Tungsten jig + maggots, Small balance jig |
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 |
Count 3 structure marks on this chart. The deepest, Deep basin, sits near 25 ft.
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.
Anglers target brown trout, european perch, northern pike 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.
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.
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.
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
More water nearby: Gwynedd fishing maps (35 charts). Browse all United Kingdom fishing maps. See every water on DepthScout. How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.