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15-acre lake near Powys. The lake tops out around 32 ft. These contours are modeled — built from the real shoreline and the water's maximum depth — so read them as a guide, never as navigation. Here's the year, species by species, as the scoring engine sees it.
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 50% 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. You'll find it in Powys. The nearest mapped water is Llyn Fyrddon Fawr, 3 mi to the west.
Come spring, look for brown trout tight to the bank in 3 to 25 ft. Expect a summer slide to 10 to 32 ft, then a winter hold in 5 to 32 ft. Start at Break off the point. It's a drop-off holding about 14 ft of water and rates prime come summer. Prime time lands in after dark and early morning. A spoon at the thermocline or a deep stickbait (night) 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 | 3 to 25 ft | dawn & dusk | Main-lake point (8 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 10 to 32 ft chart-limited; documented 25 to 60 ft | night & dawn | Break off the point (14 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 5 to 30 ft | dusk & dawn | Main-lake point (8 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 5 to 32 ft chart-limited; documented 5 to 35 ft | dawn | Break off the point (14 ft) | Jigging spoon, Small stickbait (slow) |
The spring pattern is a shallow one: european perch in 3 to 12 ft. As the season builds they drop to 8 to 28 ft, wintering in 10 to 32 ft. Top water on the chart: Shallow bay flat, a weed flat in the 4 ft range, prime in spring. Time it for early morning. Summer baits: a drop-shot micro plastics or a small crankbait (perch pattern) gets it done.
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 (4 ft) | Small jig + curly tail, Inline spinner #1-2 |
| Summer | 8 to 28 ft | dawn | Deep basin (27 ft) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Fall | 10 to 32 ft chart-limited; documented 10 to 33 ft | midday | Deep basin (27 ft) | Jigging spoon (small), Drop-shot on deep flats |
| Winter | 10 to 32 ft chart-limited; documented 12 to 33 ft | midday & dawn | Deep basin (27 ft) | Tungsten jig + maggots, Small balance jig |
Start shallow in spring: northern pike sit in 2 to 8 ft that time of year. Warm water sends them out to 8 to 20 ft; cold water stacks them in 5 to 15 ft. Top water on the chart: Shallow bay flat, a weed flat in the 4 ft range, prime in spring. Fish it in early morning and the evening and you'll meet the bite. Throw a bucktail or a weedless spoon over cabbage until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (4 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 8 to 20 ft | dawn & dusk | Break off the point (14 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Break off the point (14 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Shallow bay flat (4 ft) | Tip-ups, Large jigging spoon |
Early season arctic char use the shallows, holding in 4 to 15 ft. Summer is a 10 to 32 ft game here, winter an 8 to 32 ft one. The chart's best answer is Deep basin — deep basin, 27 ft, prime for summer. Best bite is early morning. Tie on a jigging spoon vertical or a tube jig (smelt) 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 | 4 to 15 ft | midday & dawn | Break off the point (14 ft) | Small casting spoon (silver/orange), Jerkbait (small) |
| Summer | 10 to 32 ft chart-limited; documented 20 to 60 ft | dawn | Deep basin (27 ft) | Jigging spoon vertical, Tube jig (smelt) |
| Fall | 8 to 30 ft | midday & dusk | Break off the point (14 ft) | Casting spoon (orange/gold), Beadhead streamer |
| Winter | 8 to 32 ft chart-limited; documented 10 to 40 ft | midday & dawn | Deep basin (27 ft) | Jigging spoon (glow/silver), Tungsten jig + plastic |
Llyn Cerrigllwydion Isaf carries 4 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 27 ft down.
Llyn Cerrigllwydion Isaf is about 32 ft (10 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, arctic char on Llyn Cerrigllwydion Isaf. 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 4 ft of water that rates prime for european perch in spring. 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.
Llyn Fyrddon Fawr 3 mi · Llyn Egnant 4 mi · Llyn Hîr 4 mi · Llyn Teifi 4 mi · Llyn Gynon 4 mi · Llyn Isaf 4 mi · Llynnoedd Ieuan 8 mi · Llyn Berwyn 10 mi · Maes-Llyn 10 mi · Llyn Clywedog 13 mi · Bugeilyn 14 mi · Llyn Cwm-byr 14 mi
See how Llyn Cerrigllwydion Isaf stacks up: best northern pike lakes in United Kingdom · best european perch lakes in United Kingdom · best brown trout lakes in United Kingdom · best arctic char 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.