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15-acre lake near Conwy. The lake tops out around 23 ft. What you see is a modeled chart: the shoreline is real, the max depth is published, and the contours between are estimated. Plan with it; don't navigate by it. The season-by-season read for each species follows, from the map's own numbers.
Drawn out, this is 15 acres of water rimmed by 0.8 miles of bank. A shoreline index of 1.4 says round and simple: fish relate to depth changes here, not shoreline features. Roughly 77% of the water is 15 ft or less as modeled, the band where the food chain lives. Figure 0.3 mi of water from one end to the other. The water lies in Conwy. The nearest mapped water is Llyn Bychan, 0 mi to the north.
Early season brown trout use the shallows, holding in 3 to 23 ft. Even in summer they hold at 7 to 23 ft; winter keeps them in 3 to 23 ft. The chart's best answer is Break off the point — drop-off, 10 ft, prime for summer. Best bite is 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 23 ft chart-limited; documented 3 to 25 ft | dawn & dusk | Main-lake point (8 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 7 to 23 ft chart-limited; documented 25 to 60 ft | night & dawn | Break off the point (10 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 4 to 23 ft chart-limited; documented 5 to 30 ft | dusk & dawn | Main-lake point (8 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 3 to 23 ft chart-limited; documented 5 to 35 ft | dawn | Break off the point (10 ft) | Jigging spoon, Small stickbait (slow) |
Spring puts european perch in skinny water — 3 to 12 ft is the zone. Warm water sends them out to 7 to 23 ft; cold water stacks them in 7 to 23 ft. Deep basin is the standout, a deep basin at roughly 20 ft, rated prime for fall european perch. Plan around early morning in the warm months. 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 (10 ft) | Small jig + curly tail, Inline spinner #1-2 |
| Summer | 7 to 23 ft chart-limited; documented 8 to 28 ft | dawn | Deep basin (20 ft) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Fall | 7 to 23 ft chart-limited; documented 10 to 33 ft | midday | Deep basin (20 ft) | Jigging spoon (small), Drop-shot on deep flats |
| Winter | 7 to 23 ft chart-limited; documented 12 to 33 ft | midday & dawn | Deep basin (20 ft) | Tungsten jig + maggots, Small balance jig |
Spring puts northern pike in skinny water — 2 to 8 ft is the zone. As the season builds they drop to 8 to 20 ft, wintering in 5 to 15 ft. Fall northern pike concentrate at Break off the point, a prime-rated drop-off around 10 ft. Warm-month bites cluster around early morning and the evening. 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 (10 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Break off the point (10 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 |
Llyn Goddionduon carries 3 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 20 ft down.
Llyn Goddionduon is about 23 ft (7 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 Goddionduon. 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 20 ft of water that rates prime for european perch in fall. Open the map above to see every rated spot for each 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 Bychan 0 mi · Llyn Bodgynydd 1 mi · Llyn Geirionydd 2 mi · Llyn Crafnant 2 mi · Llyn y Parc 2 mi · Llyn Cowlyd Reservoir 3 mi · Llyn Eigiau Reservoir 5 mi · Ffynnon Llugwy Reservoir 5 mi · Llynau Diwaunedd 5 mi · Llyn Ogwen 6 mi · Llyn Bochlwyd 6 mi · Llyn Cwmffynnon 7 mi
See how Llyn Goddionduon 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: Conwy fishing maps (18 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.