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Fishing Llyn Tecwyn Isaf: what the data says
6-acre lake near Gwynedd. The lake tops out around 23 ft. The chart is a model: real shoreline, published maximum depth, interpolated in between. A planning tool, never a navigation product. The season-by-season read for each species follows, from the map's own numbers.
On the chart, Llyn Tecwyn Isaf draws 6 acres inside 0.5 miles of shoreline. Nearly circular (index 1.4), so the story is the bottom, not the bank. Roughly 67% of the water is 15 ft or less as modeled, the band where the food chain lives.
Brown Trout fishing at Llyn Tecwyn Isaf
When the water first warms, brown trout slide up into 3 to 23 ft. There's no big seasonal slide here — summer means 7 to 23 ft, winter 3 to 23 ft. If you only fish one area, make it Break off the point: a drop-off around 10 ft that scores prime in summer. In summer the feeding windows fall in after dark and early morning. Keep a spoon at the thermocline or a deep stickbait (night) rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 23 ft | dawn & dusk | Main-lake point (8 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 7 to 23 ft | night & dawn | Break off the point (10 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 4 to 23 ft | dusk & dawn | Main-lake point (8 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 3 to 23 ft | dawn | Break off the point (10 ft) | Jigging spoon, Small stickbait (slow) |
European Perch fishing at Llyn Tecwyn Isaf
Start shallow in spring: european perch sit in 3 to 12 ft that time of year. Summer pushes them deeper, 7 to 23 ft, and winter fish settle into 7 to 23 ft. The spot to know is Deep basin, a deep basin in about 20 ft of water that rates prime for european perch in fall. Warm-month bites cluster around early morning. Throw a drop-shot micro plastics or a small crankbait (perch pattern) until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | open water | Small jig + curly tail, Inline spinner #1-2 |
| Summer | 7 to 23 ft | dawn | Deep basin (20 ft) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Fall | 7 to 23 ft | midday | Deep basin (20 ft) | Jigging spoon (small), Drop-shot on deep flats |
| Winter | 7 to 23 ft | midday & dawn | Deep basin (20 ft) | Tungsten jig + maggots, Small balance jig |
Northern Pike fishing at Llyn Tecwyn Isaf
The spring pattern is a shallow one: northern pike in 2 to 8 ft. Midsummer fish sit out in 8 to 20 ft before dropping to 5 to 15 ft for winter. The spot to know is Break off the point, a drop-off in about 10 ft of water that rates prime for northern pike in fall. Plan around early morning and the evening in the warm months. Summer baits: a bucktail or a weedless spoon over cabbage gets it done.
| 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 |
Notable structure
- Deep basin: deep basin, around 20 ft
- Break off the point: drop-off, around 10 ft
- Main-lake point: point, around 8 ft
Common questions
How deep is Llyn Tecwyn Isaf?
Llyn Tecwyn Isaf 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.
What fish are in Llyn Tecwyn Isaf?
Anglers target northern pike, european perch, brown trout on Llyn Tecwyn 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.
Where is the best fishing spot on Llyn Tecwyn Isaf?
Deep basin is the top-rated area: a deep basin in about 20 ft of water that rates prime for european perch in fall. Scroll up to the map for the complete spot list by species and season.
When is the best time to fish Llyn Tecwyn Isaf?
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.
Nearby waters
Llyn Llenyrch 2 mi · Llyn Cwm Bychan 4 mi · Llyn Trawsfynydd 4 mi · Gloyw Lyn 4 mi · Llyn Du 5 mi · Llyn Hywel 7 mi · Llyn y Bi 7 mi · Llyn Llagi 7 mi · Llyn Dulyn 8 mi · Llyn Bodlyn 8 mi · Llyn y Garn 8 mi · Llyn Edno 8 mi
See how Llyn Tecwyn Isaf stacks up: best northern pike lakes in United Kingdom · best european perch lakes in United Kingdom · best brown trout lakes in United Kingdom
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