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144-acre lake near Clackmannanshire. The lake tops out around 21 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 1905, digitized from the bathymetric atlas published in 1910. The rest of this page walks each species through its year, using the map's own scoring.
The outline encloses 144 acres, worked by 3 miles of shoreline. A middling shoreline index (1.8) gives it some bays to work without being a maze. The shallow band under 15 ft claims about 87% of the surface — that's where the groceries are. End to end it runs roughly 1 mi, about 0.4 mi across. It sits in Clackmannanshire. If the bite dies, Peppermill Dam is 4 mi to the southeast.
Start shallow in spring: brown trout sit in 3 to 21 ft that time of year. They don't go far with the seasons — 6 to 21 ft covers summer, 3 to 21 ft covers winter. Top water on the chart: Deep basin, a deep basin in the 21 ft range, prime in summer. Fish it in after dark and early morning and you'll meet the bite. 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 21 ft chart-limited; documented 3 to 25 ft | dawn & dusk | Secondary point (5 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 6 to 21 ft chart-limited; documented 25 to 60 ft | night & dawn | Deep basin (21 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 4 to 21 ft chart-limited; documented 5 to 30 ft | dusk & dawn | Secondary point (5 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 3 to 21 ft chart-limited; documented 5 to 35 ft | dawn | Break off the point (4 ft) | Jigging spoon, Small stickbait (slow) |
When the water first warms, european perch slide up into 3 to 12 ft. Summer is a 6 to 21 ft game here, winter a 6 to 21 ft one. Start at Back-bay flat. It's a weed flat holding about 6 ft of water and rates prime come spring. The feeding windows run early morning. Keep a drop-shot micro plastics or a small crankbait (perch pattern) rigged through the warm months.
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 | Back-bay flat (6 ft) | Small jig + curly tail, Inline spinner #1-2 |
| Summer | 6 to 21 ft chart-limited; documented 8 to 28 ft | dawn | Deep basin (21 ft) | Drop-shot micro plastics, Small crankbait (perch pattern) |
| Fall | 6 to 21 ft chart-limited; documented 10 to 33 ft | midday | Deep basin (21 ft) | Jigging spoon (small), Drop-shot on deep flats |
| Winter | 6 to 21 ft chart-limited; documented 12 to 33 ft | midday & dawn | Deep basin (21 ft) | Tungsten jig + maggots, Small balance jig |
Spring northern pike on Gartmorn Dam hold shallow, usually 2 to 8 ft. They move out to 8 to 20 ft in summer and finish the year down in 5 to 15 ft. Put Shallow bay flat first on the milk run — a weed flat near 2 ft that grades prime for spring. The feeding windows run 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 (2 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 8 to 20 ft | dawn & dusk | Back-bay flat (6 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Back-bay flat (6 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Back-bay flat (6 ft) | Tip-ups, Large jigging spoon |
Structure-wise the chart holds 6 features, led in depth by Deep basin at roughly 21 ft.
Gartmorn Dam is about 21 ft (6 m) deep at its deepest point. The depth data here comes from Murray & Pullar's Scottish loch survey of 1905, digitized from the bathymetric atlas published in 1910.
Anglers target brown trout, european perch, northern pike on Gartmorn Dam. 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.
Back-bay flat is the top-rated area: a weed flat in about 6 ft of water that rates prime for european perch in spring. The map above holds the full rated-spot list for every 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.
Peppermill Dam 4 mi · Moor Loch 4 mi · Linlithgow Loch 11 mi · Loch Fitty 13 mi · Loch Leven 15 mi · Pond of Drummond 16 mi · Loch of Balloch 16 mi · Loch Gelly 17 mi · Loch Monzievaird or Loch Monviezard 19 mi · Harperleas Reservoir 19 mi · Holl Reservoir 20 mi · Kinghorn Loch 21 mi
See how Gartmorn Dam stacks up: best northern pike lakes in United Kingdom · best european perch lakes in United Kingdom · best brown trout lakes in United Kingdom
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.