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3-acre lake near Isle of Anglesey. The lake tops out around 21 ft. Contours on this water are modeled from its actual shoreline and max depth. Good for finding likely water, never for navigation. What the data behind the map says about each species, season by season:
The outline encloses 3 acres, worked by 0.3 miles of shoreline. At index 1.1 the outline is almost a bowl — read the depth changes, not the shoreline. About 46% of the surface sits shallower than 15 ft on the modeled chart — that's the weed-and-bait zone. Isle of Anglesey claims this one. If the bite dies, Llyn yr Wyth-Eidion is 1 mi to the west.
Start shallow in spring: brown trout sit in 3 to 21 ft that time of year. They don't go far with the seasons — 6 to 21 ft covers summer, 3 to 21 ft covers winter. The spot to know is Shoreline break, a drop-off in about 9 ft of water that rates prime for brown trout in summer. Warm-month bites cluster around after dark and early morning. Throw a spoon at the thermocline or a deep stickbait (night) until the fish tell you otherwise.
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 21 ft chart-limited; documented 3 to 25 ft | dawn & dusk | Shoreline break (9 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 6 to 21 ft chart-limited; documented 25 to 60 ft | night & dawn | Shoreline break (9 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 4 to 21 ft chart-limited; documented 5 to 30 ft | dusk & dawn | Shoreline break (9 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 3 to 21 ft chart-limited; documented 5 to 35 ft | dawn | Shoreline break (9 ft) | Jigging spoon, Small stickbait (slow) |
When the water first warms, european perch slide up into 3 to 12 ft. By summer they slide out to 6 to 21 ft, and by winter most fish are in 6 to 21 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 3 ft that scores prime in spring. In summer the feeding windows fall in early morning. Keep a drop-shot micro plastics or a small crankbait (perch pattern) rigged through the warm months.
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 | Shallow bay flat (3 ft) | Small jig + curly tail, Inline spinner #1-2 |
| Summer | 6 to 21 ft chart-limited; documented 8 to 28 ft | dawn | Deep basin (18 ft) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Fall | 6 to 21 ft chart-limited; documented 10 to 33 ft | midday | Deep basin (18 ft) | Jigging spoon (small), Drop-shot on deep flats |
| Winter | 6 to 21 ft chart-limited; documented 12 to 33 ft | midday & dawn | Deep basin (18 ft) | Tungsten jig + maggots, Small balance jig |
Spring northern pike on Llyn Cadarn hold shallow, usually 2 to 8 ft. By summer they slide out to 8 to 20 ft, and by winter most fish are in 5 to 15 ft. The chart's best answer is Shallow bay flat — weed flat, 3 ft, prime for spring. Prime time lands in early morning and the evening. The summer box starts with a bucktail or a weedless spoon over cabbage.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (3 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 8 to 20 ft | dawn & dusk | Shoreline break (9 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Shoreline break (9 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Shallow bay flat (3 ft) | Tip-ups, Large jigging spoon |
The chart marks 3 structure features on Llyn Cadarn; the deepest is Deep basin at about 18 ft.
Llyn Cadarn is about 21 ft (6 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 Cadarn. 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.
Shallow bay flat is the top-rated area: a weed flat in about 3 ft of water that rates prime for european perch in spring. 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 yr Wyth-Eidion 1 mi · Llyn Alaw 7 mi · Llyn Coron 10 mi · Llyn Penrhyn 11 mi · Llyn Dinam 11 mi · Llyn Padarn 13 mi · Llyn Anafon 15 mi · Llyn Peris 15 mi · Llyn Ogwen 16 mi · Llyn Idwal 16 mi · Llyn Cwellyn 17 mi · Ffynnon Llugwy Reservoir 17 mi
See how Llyn Cadarn 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: Isle of Anglesey fishing maps (6 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.