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13-acre lake near Gwynedd. The lake tops out around 54 ft. The contours are modeled from the water's real shoreline and maximum depth. Treat them as a rough guide, and never use them for navigation. What the data behind the map says about each species, season by season:
Llyn Llagi maps at 13 acres behind 0.5 miles of shoreline. Nearly circular (index 1), so the story is the bottom, not the bank. 17% of the surface is littoral (under ~15 ft), per the model — cover, weeds and forage water. Gwynedd claims this one. Its nearest charted neighbour, Llyn Edno, is 1 mi to the northeast.
In spring, brown trout run shallow here, mostly 3 to 25 ft. Summer pushes them deeper, 16 to 54 ft, and winter fish settle into 5 to 35 ft. Shoreline break is the standout, a drop-off at roughly 24 ft, rated prime for summer brown trout. Time it for after dark and early morning. You won't need more than a spoon at the thermocline or a deep stickbait (night) most summer days.
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 | Shoreline break (24 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 16 to 54 ft chart-limited; documented 25 to 60 ft | night & dawn | Shoreline break (24 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 5 to 30 ft | dusk & dawn | Shoreline break (24 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 5 to 35 ft | dawn | Shoreline break (24 ft) | Jigging spoon, Small stickbait (slow) |
Spring european perch on Llyn Llagi hold shallow, usually 3 to 12 ft. By summer they slide out to 8 to 28 ft, and by winter most fish are in 12 to 33 ft. The chart's best answer is Shoreline break — drop-off, 24 ft, prime for summer. Prime time lands in early morning. The summer box starts with a drop-shot micro plastics or a small crankbait (perch pattern).
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Shallow bay flat (6 ft) | Small jig + curly tail, Inline spinner #1-2 |
| Summer | 8 to 28 ft | dawn | Shoreline break (24 ft) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Fall | 10 to 33 ft | midday | Shoreline break (24 ft) | Jigging spoon (small), Drop-shot on deep flats |
| Winter | 12 to 33 ft | midday & dawn | Shoreline break (24 ft) | Tungsten jig + maggots, Small balance jig |
When the water first warms, northern pike slide up into 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. If you only fish one area, make it Shallow bay flat: a feeding flat around 6 ft that scores prime in spring. In summer the feeding windows fall in early morning and the evening. Keep a bucktail or a weedless spoon over cabbage rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (6 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 8 to 20 ft | dawn & dusk | Shallow bay flat (6 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Shallow bay flat (6 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Shallow bay flat (6 ft) | Tip-ups, Large jigging spoon |
Start shallow in spring: arctic char sit in 4 to 15 ft that time of year. Warm water sends them out to 16 to 54 ft; cold water stacks them in 10 to 40 ft. Top water on the chart: Deep basin, a deep basin in the 46 ft range, prime in summer. Fish it in early morning and you'll meet the bite. Throw a jigging spoon vertical or a tube jig (smelt) 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 | 4 to 15 ft | midday & dawn | Shallow bay flat (6 ft) | Small casting spoon (silver/orange), Jerkbait (small) |
| Summer | 16 to 54 ft chart-limited; documented 20 to 60 ft | dawn | Deep basin (46 ft) | Jigging spoon vertical, Tube jig (smelt) |
| Fall | 8 to 30 ft | midday & dusk | Shoreline break (24 ft) | Casting spoon (orange/gold), Beadhead streamer |
| Winter | 10 to 40 ft | midday & dawn | Shoreline break (24 ft) | Jigging spoon (glow/silver), Tungsten jig + plastic |
Count 3 structure marks on this chart. The deepest, Deep basin, sits near 46 ft.
Llyn Llagi is about 54 ft (16 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 Llagi. 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 46 ft of water that rates prime for arctic char in summer. 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 Edno 1 mi · Llyn Gwynant 2 mi · Llynnau Barlwyd 4 mi · Llynau Diwaunedd 4 mi · Llyn Llydaw 4 mi · Llyn Teyrn 4 mi · Glaslyn 4 mi · Llyn Cwmffynnon 5 mi · Llyn y Gader 6 mi · Llyn Du 6 mi · Llyn Gamallt Fach 6 mi · Llyn Llenyrch 7 mi
See how Llyn Llagi 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: 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.