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627-acre lake near Na h-Eileanan an Iar. The lake tops out around 35 ft. Bathymetry on this water is estimated from its real outline and maximum depth. Use it to shortlist water, then verify with your electronics — and never navigate by it. What follows comes from the same scoring engine that paints the spots above.
Loch Trealabhal or Loch Trealaval maps at 625 acres behind 20.3 miles of shoreline. An index of 5.8 puts the bank firmly in maze territory: point after pocket after cove, every one a casting target. Roughly 83% of the water is 15 ft or less as modeled, the band where the food chain lives. End to end it runs roughly 2.4 mi, about 1.9 mi across. Na h-Eileanan Siar claims this one. If the bite dies, Loch Dhomhnaill Bhig is 1 mi to the southeast.
Start shallow in spring: brown trout sit in 3 to 25 ft that time of year. Summer pushes them deeper, 11 to 35 ft, and winter fish settle into 5 to 35 ft. The spot to know is Break off the point, a drop-off in about 16 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 25 ft | dawn & dusk | Main-lake point (9 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 11 to 35 ft chart-limited; documented 25 to 60 ft | night & dawn | Break off the point (16 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 5 to 30 ft | dusk & dawn | Main-lake point (9 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 5 to 35 ft | dawn | Break off the point (16 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 8 to 28 ft, and by winter most fish are in 12 to 33 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 4 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.
| 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 | Break off the point (16 ft) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Fall | 10 to 33 ft | midday | Deep basin (30 ft) | Jigging spoon (small), Drop-shot on deep flats |
| Winter | 12 to 33 ft | midday & dawn | Deep basin (30 ft) | Tungsten jig + maggots, Small balance jig |
Spring northern pike on Loch Trealabhal or Loch Trealaval 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, 4 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 (4 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 8 to 20 ft | dawn & dusk | Break off the point (16 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Break off the point (16 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 |
Spring puts arctic char in skinny water — 4 to 15 ft is the zone. Warm water sends them out to 11 to 35 ft; cold water stacks them in 9 to 35 ft. Deep basin is the standout, a deep basin at roughly 30 ft, rated prime for summer arctic char. Plan around early morning in the warm months. A jigging spoon vertical or a tube jig (smelt) 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 | 4 to 15 ft | midday & dawn | Break off the point (16 ft) | Small casting spoon (silver/orange), Jerkbait (small) |
| Summer | 11 to 35 ft chart-limited; documented 20 to 60 ft | dawn | Deep basin (30 ft) | Jigging spoon vertical, Tube jig (smelt) |
| Fall | 8 to 30 ft | midday & dusk | Break off the point (16 ft) | Casting spoon (orange/gold), Beadhead streamer |
| Winter | 9 to 35 ft chart-limited; documented 10 to 40 ft | midday & dawn | Deep basin (30 ft) | Jigging spoon (glow/silver), Tungsten jig + plastic |
Loch Trealabhal or Loch Trealaval carries 6 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 30 ft down.
Loch Trealabhal or Loch Trealaval is about 35 ft (11 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 Loch Trealabhal or Loch Trealaval. 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. Every other rated spot, per species and season, is on the map above.
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.
Loch Dhomhnaill Bhig 1 mi · Loch Fad a Gobha or Loch Fadagoa 2 mi · Loch nan Deas Phoirt 2 mi · Loch Bhaltois or Loch Valtos 3 mi · Loch Stranndabhat or Loch Strandavat 3 mi · Loch Sgiobacleit or Loch Sgibacleit 5 mi · Loch a Chlachain 8 mi · Loch Langabhat or Loch Langavat 8 mi · Loch Bhatandìob or Loch Vatandip 8 mi · Loch Blar Na Fola 8 mi · Loch Morsgail 9 mi · unnamed 9 mi
See how Loch Trealabhal or Loch Trealaval 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: Na h-Eileanan Siar fishing maps (84 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.