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6-acre lake near Powys. The lake tops out around 8 ft. Contours on this water are modeled from its actual shoreline and max depth. Good for finding likely water, never for navigation. Species by species, here's what the data says the year looks like.
Llyn Cwm-byr maps at 6 acres behind 0.7 miles of shoreline. With a 2 development index there's bank structure worth casting at, in moderation. Every acre of it sits shallower than ~15 ft: one big littoral zone, cover and forage throughout. Figure 0.3 mi of water from one end to the other. Powys claims this one. Its nearest charted neighbour, Bugeilyn, is 0 mi to the southeast.
Spring puts brown trout in skinny water — 1 to 8 ft is the zone. Summer fish stay in 2 to 8 ft, and winter fish hold in 1 to 8 ft. Summer brown trout concentrate at Deep basin, a prime-rated deep basin around 7 ft. Warm-month bites cluster around after dark and early morning. A spoon at the thermocline or a deep stickbait (night) 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 | 1 to 8 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 | 2 to 8 ft chart-limited; documented 25 to 60 ft | night & dawn | Deep basin (7 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 1 to 8 ft chart-limited; documented 5 to 30 ft | dusk & dawn | Main-lake point (8 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 1 to 8 ft chart-limited; documented 5 to 35 ft | dawn | Deep basin (7 ft) | Jigging spoon, Small stickbait (slow) |
Early season european perch use the shallows, holding in 2 to 8 ft. Even in summer they hold at 2 to 8 ft; winter keeps them in 2 to 8 ft. Put Deep basin first on the milk run — a deep basin near 7 ft that grades prime for fall. In summer the feeding windows fall in early morning. Tie on a drop-shot micro plastics or a small crankbait (perch pattern) 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 | 2 to 8 ft chart-limited; documented 3 to 12 ft | midday & dawn | open water | Small jig + curly tail, Inline spinner #1-2 |
| Summer | 2 to 8 ft chart-limited; documented 8 to 28 ft | dawn | Deep basin (7 ft) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Fall | 2 to 8 ft chart-limited; documented 10 to 33 ft | midday | Deep basin (7 ft) | Jigging spoon (small), Drop-shot on deep flats |
| Winter | 2 to 8 ft chart-limited; documented 12 to 33 ft | midday & dawn | Deep basin (7 ft) | Tungsten jig + maggots, Small balance jig |
Come spring, look for northern pike tight to the bank in 2 to 8 ft. Through summer count on 2 to 8 ft; the winter hold is 2 to 8 ft. Start at Main-lake point. It's a point holding about 8 ft of water and rates prime come fall. Prime time lands in early morning and the evening. A bucktail or a weedless spoon over cabbage is the honest summer answer here.
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 | 2 to 8 ft | midday & dawn | open water | #5 inline spinner, Spoon (red/white) |
| Summer | 2 to 8 ft chart-limited; documented 8 to 20 ft | dawn & dusk | Main-lake point (8 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 2 to 8 ft chart-limited; documented 6 to 18 ft | midday & dawn | Main-lake point (8 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 2 to 8 ft chart-limited; documented 5 to 15 ft | midday | Main-lake point (8 ft) | Tip-ups, Large jigging spoon |
The chart marks 2 structure features on Llyn Cwm-byr; the deepest is Main-lake point at about 8 ft.
Llyn Cwm-byr is about 8 ft (2 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 Cwm-byr. 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 7 ft of water that rates prime for european perch in fall. The map above holds the full rated-spot list for every 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.
Bugeilyn 0 mi · Glaslyn 1 mi · Llyn Penrhaeadr 4 mi · Llyn Clywedog 5 mi · Llyn Glanmerin 6 mi · Llynnoedd Ieuan 7 mi · Llyn Isaf 11 mi · Tal-y-llyn Lake 12 mi · Llyn Cau 14 mi · Llyn Fyrddon Fawr 14 mi · Llyn Cerrigllwydion Isaf 14 mi · Llyn y Gadair 15 mi
See how Llyn Cwm-byr 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: Powys fishing maps (11 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.