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176-acre lake near Highland. The lake tops out around 12 ft. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled. The depth data here comes from Murray & Pullar's Scottish loch survey of 1902, digitized from the bathymetric atlas published in 1910. Here's the year, species by species, as the scoring engine sees it.
Traced from the shoreline, Loch Truderscaig runs 176 acres with 2.6 miles of edge. Nearly circular (index 1.4), so the story is the bottom, not the bank. There is no deep basin to speak of — the entire surface is under ~15 ft, prime weed water end to end. Figure 0.8 mi of water from one end to the other, 0.6 mi at the beam. The water lies in Highland. For a second option, Loch an Alltan Fheàrna lies 2 mi east.
Early season brown trout use the shallows, holding in 1 to 12 ft. Even in summer they hold at 4 to 12 ft; winter keeps them in 2 to 12 ft. The chart's best answer is Break off the point — drop-off, 6 ft, prime for summer. Best bite is after dark and early morning. Tie on a spoon at the thermocline or a deep stickbait (night) 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 | 1 to 12 ft chart-limited; documented 3 to 25 ft | dawn & dusk | Main-lake point (4 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 4 to 12 ft chart-limited; documented 25 to 60 ft | night & dawn | Break off the point (6 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 2 to 12 ft chart-limited; documented 5 to 30 ft | dusk & dawn | Main-lake point (4 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 2 to 12 ft chart-limited; documented 5 to 35 ft | dawn | Break off the point (6 ft) | Jigging spoon, Small stickbait (slow) |
Spring puts european perch in skinny water — 3 to 12 ft is the zone. Summer fish stay in 3 to 12 ft, and winter fish hold in 4 to 12 ft. Shallow bay flat is the standout, a weed flat at roughly 4 ft, rated prime for spring european perch. Plan around early morning in the warm months. A drop-shot micro plastics or a small crankbait (perch pattern) 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 | 3 to 12 ft | midday & dawn | Shallow bay flat (4 ft) | Small jig + curly tail, Inline spinner #1-2 |
| Summer | 3 to 12 ft chart-limited; documented 8 to 28 ft | dawn | Deep basin (11 ft) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Fall | 4 to 12 ft chart-limited; documented 10 to 33 ft | midday | Deep basin (11 ft) | Jigging spoon (small), Drop-shot on deep flats |
| Winter | 4 to 12 ft chart-limited; documented 12 to 33 ft | midday & dawn | Deep basin (11 ft) | Tungsten jig + maggots, Small balance jig |
Spring puts northern pike in skinny water — 2 to 8 ft is the zone. As the season builds they drop to 4 to 12 ft, wintering in 4 to 12 ft. Spring northern pike concentrate at Shallow bay flat, a prime-rated weed flat around 4 ft. Warm-month bites cluster around early morning and the evening. A bucktail or a weedless spoon over cabbage 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 | 2 to 8 ft | midday & dawn | Shallow bay flat (4 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 4 to 12 ft chart-limited; documented 8 to 20 ft | dawn & dusk | Shallow bay flat (4 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 4 to 12 ft chart-limited; documented 6 to 18 ft | midday & dawn | Shallow bay flat (4 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 4 to 12 ft chart-limited; documented 5 to 15 ft | midday | Shallow bay flat (4 ft) | Tip-ups, Large jigging spoon |
Loch Truderscaig carries 6 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 11 ft down.
Loch Truderscaig is about 12 ft (4 m) deep at its deepest point. The depth data here comes from Murray & Pullar's Scottish loch survey of 1902, digitized from the bathymetric atlas published in 1910.
Anglers target brown trout, european perch, northern pike on Loch Truderscaig. 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. 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.
Loch an Alltan Fheàrna 2 mi · Loch Choire or Loch Coir an Fhearna 6 mi · Loch Naver 6 mi · Loch Achnamoine 6 mi · Loch Coire nam Mang 7 mi · Loch a Bhealaich 8 mi · Loch Druim a Chliabhain 8 mi · Loch Syre 8 mi · Loch Arichlinie 8 mi · Lochan Dubh Cadhafuaraich 9 mi · Loch an Ruathair or Loch Ruthair 10 mi · Loch Coulside or Loch Cuil na Sithe 10 mi
See how Loch Truderscaig 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: Highland fishing maps (242 charts). Browse all United Kingdom fishing maps. See every water on DepthScout. Bathymetry: published agency survey data. 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.