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54-acre lake near Highland. The lake tops out around 14 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 is how the season plays out for each species, straight from the data behind the map.
On the chart, Loch Coulside or Loch Cuil na Sithe draws 54 acres inside 2.1 miles of shoreline. The shoreline is moderately structured (index 2) — enough points and pockets to pattern. There is no deep basin to speak of — the entire surface is under ~15 ft, prime weed water end to end. Tip to tip the water measures near 0.9 mi. The water lies in Highland. For a second option, Loch Loyal lies 4 mi northeast.
Come spring, look for brown trout tight to the bank in 2 to 14 ft. Through summer count on 4 to 14 ft; the winter hold is 2 to 14 ft. If you only fish one area, make it Break off the point: a drop-off around 5 ft that scores prime in summer. Best bite is 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 | 2 to 14 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 14 ft chart-limited; documented 25 to 60 ft | night & dawn | Break off the point (5 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 2 to 14 ft chart-limited; documented 5 to 30 ft | dusk & dawn | Main-lake point (4 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 2 to 14 ft chart-limited; documented 5 to 35 ft | dawn | Break off the point (5 ft) | Jigging spoon, Small stickbait (slow) |
The spring pattern is a shallow one: european perch in 3 to 12 ft. Midsummer fish sit out in 4 to 14 ft before dropping to 4 to 14 ft for winter. The spot to know is Deep basin, a deep basin in about 14 ft of water that rates prime for european perch in fall. Plan around early morning in the warm months. 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 (2 ft) | Small jig + curly tail, Inline spinner #1-2 |
| Summer | 4 to 14 ft chart-limited; documented 8 to 28 ft | dawn | Deep basin (14 ft) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Fall | 4 to 14 ft chart-limited; documented 10 to 33 ft | midday | Deep basin (14 ft) | Jigging spoon (small), Drop-shot on deep flats |
| Winter | 4 to 14 ft chart-limited; documented 12 to 33 ft | midday & dawn | Deep basin (14 ft) | Tungsten jig + maggots, Small balance jig |
Start shallow in spring: northern pike sit in 2 to 8 ft that time of year. Summer pushes them deeper, 4 to 14 ft, and winter fish settle into 4 to 14 ft. The spot to know is Shallow bay flat, a weed flat in about 2 ft of water that rates prime for northern pike in spring. Warm-month bites cluster around early morning and the evening. Throw a bucktail or a weedless spoon over cabbage 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 | 2 to 8 ft | midday & dawn | Shallow bay flat (2 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 4 to 14 ft chart-limited; documented 8 to 20 ft | dawn & dusk | Break off the point (5 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 4 to 14 ft chart-limited; documented 6 to 18 ft | midday & dawn | Break off the point (5 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 4 to 14 ft chart-limited; documented 5 to 15 ft | midday | Shallow bay flat (2 ft) | Tip-ups, Large jigging spoon |
6 pieces of structure are mapped here — Deep basin, around 14 ft, is the deepest of them.
Loch Coulside or Loch Cuil na Sithe is about 14 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 Coulside or Loch Cuil na Sithe. 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 14 ft of water that rates prime for european perch in fall. 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 Loyal 4 mi · Loch an Dheurue 4 mi · Loch Meadie 5 mi · Loch Naver 5 mi · Loch Syre 5 mi · Loch Craggie 6 mi · unnamed 7 mi · Loch Choire or Loch Coir an Fhearna 10 mi · Loch Hope 10 mi · Loch Truderscaig 10 mi · Loch a Bhealaich 11 mi · Loch an Alltan Fheàrna 12 mi
See how Loch Coulside or Loch Cuil na Sithe 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.