Fionn Loch or Dubh Loch Depth Map & Fishing Spots (UK)

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Lake depth chart

Fionn Loch or Dubh Loch, UK

Max 144 ft

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Where to start

Sedge season & the Murrough window is on — see the hatch outlook

Hatch outlook

Sedge season & the MurroughActive window

Typical here: Jun 1 – Sep 30 · the Murrough and Green Peter are lough patterns from July, peaking the last weeks of August; evening sedge fishing runs to the season close

pupawarm summer evenings as the light fades
adultlate evening into dark, on calm water — the great red sedge is large enough to provoke explosive surface takes from big trout — fished dry off the shorelines and on the drift

Big-fish-on-top fishing in the last two hours of light — the sedge weeks of late August produce some of the best days of the lough year.

The evening sedge pulls big trout to the shorelines in low light — exactly when small surface plugs and slow-twitched 4–5cm minnowbaits shine along the rocky shores and weed edges; or run a bubble float with a dry Murrough behind it, twitched on the pause.

The event happens over lough shorelines, rocky shallows and weed edges on warm, calm summer evenings

Daddy-Long-Legs (crane fly)Active window

Typical here: Jul 1 – Oct 15 · dapped daddies documented from early July on Corrib; the famous window is mid-August through September, with grasshopper dapping in the same weeks

adultdaytime, on a drift with a wave — best on the breezy days that blow craneflies off the banks — the documented method is dapping: a natural or artificial daddy on a long rod and floss line, skipping across the surface ahead of the drifting boat; a dry daddy on the drift is the modern equivalent

The autumn wake-up: big trout that ignored everything through June and July suddenly become aggressive — often the largest browns of the season on a dry fly.

Fish the windward drifts where the terrestrials land — surface plugs twitched on a wave, or a bubble float trailing a daddy skipped on the surface (dapping with spin gear, effectively). The late-season big-fish window before the September close.

The event happens over windward shorelines, island shallows and drift lines on breezy August–September days

Next on this water

Buzzers & Duckfly (chironomids) · midgeMar 15 – Jun 30 · in ~6 months

Spring roach spawn (predator event) · baitfishApr 15 – Jun 15 · in ~7 months

Hawthorn Fly · terrestrialsApr 18 – May 15 · in ~7 months

The Mayfly (Ephemera danica) · mayflyApr 25 – Jul 5 · in ~7 months

Recommendations come from depth structure and seasonal species behavior. Treat them as a starting point, not a guarantee. Contours on this water are approximations. Never use for navigation. Always check local regulations.

Depth · ft

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Recent catches at Fionn Loch or Dubh Loch

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Fishing Fionn Loch or Dubh Loch: what the data says

2,524-acre lake near Highland. The lake tops out around 144 ft. These contours are modeled — built from the real shoreline and the water's maximum depth — so read them as a guide, never as navigation. Every species below gets its seasonal read from the same numbers driving the chart.

Drawn out, this is 2,518 acres of water rimmed by 22.9 miles of bank. A development index of 3.3 means a maze of bays and points: far more casting targets than a round bowl of the same size. Roughly 14% of the water is 15 ft or less as modeled, the band where the food chain lives. Figure 5.9 mi of water from one end to the other, 2.1 mi at the beam. The water lies in Highland. For a second option, Loch na Mòine Buige lies 3 mi northwest.

Brown Trout fishing at Fionn Loch or Dubh Loch

Come spring, look for brown trout tight to the bank in 3 to 25 ft. They move out to 25 to 60 ft in summer and finish the year down in 5 to 35 ft. If you only fish one area, make it Sharp break: a drop-off around 31 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.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 25 ft	dawn & dusk	Shoreline point (14 ft)	Stickbait off planer boards (shallow), Small spoon along mud lines
Summer	25 to 60 ft	night & dawn	Sharp break (31 ft)	Spoon at the thermocline, Deep stickbait (night)
Fall	5 to 30 ft	dusk & dawn	Shoreline point (14 ft)	Jerkbait over gravel, Casting spoon
Winter	5 to 35 ft	dawn	Sharp break (31 ft)	Jigging spoon, Small stickbait (slow)

European Perch fishing at Fionn Loch or Dubh Loch

The spring pattern is a shallow one: european perch in 3 to 12 ft. Midsummer fish sit out in 8 to 28 ft before dropping to 12 to 33 ft for winter. The spot to know is Sharp break, a drop-off in about 31 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.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 12 ft	midday & dawn	Shallow bay flat (6 ft)	Small jig + curly tail, Inline spinner #1-2
Summer	8 to 28 ft	dawn	Offshore hump (22 ft)	Drop-shot micro plastics, Small crankbait (perch pattern)
Fall	10 to 33 ft	midday	Sharp break (31 ft)	Jigging spoon (small), Drop-shot on deep flats
Winter	12 to 33 ft	midday & dawn	Offshore hump (22 ft)	Tungsten jig + maggots, Small balance jig

Northern Pike fishing at Fionn Loch or Dubh Loch

Start shallow in spring: northern pike sit in 2 to 8 ft that time of year. Summer pushes them deeper, 8 to 20 ft, and winter fish settle into 5 to 15 ft. The spot to know is Shallow bay flat, a feeding flat in about 6 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.

Season	Depth	Best window	Start at	Go-to baits
Spring	2 to 8 ft	midday & dawn	Shallow bay flat (6 ft)	#5 inline spinner, Spoon (red/white)
Summer	8 to 20 ft	dawn & dusk	Shoreline point (14 ft)	Bucktail, Weedless spoon over cabbage
Fall	6 to 18 ft	midday & dawn	Shoreline point (14 ft)	Big rubber (Bull Dawg style), Husky-style jerkbait
Winter	5 to 15 ft	midday	Shallow bay flat (6 ft)	Tip-ups, Large jigging spoon

Arctic Char fishing at Fionn Loch or Dubh Loch

Early season arctic char use the shallows, holding in 4 to 15 ft. Expect a summer slide to 20 to 60 ft, then a winter hold in 10 to 40 ft. Put Offshore hump first on the milk run — an offshore hump near 22 ft that grades prime for summer. In summer the feeding windows fall in early morning. Tie on a jigging spoon vertical or a tube jig (smelt) and you're in the game.

Season	Depth	Best window	Start at	Go-to baits
Spring	4 to 15 ft	midday & dawn	Shallow bay flat (6 ft)	Small casting spoon (silver/orange), Jerkbait (small)
Summer	20 to 60 ft	dawn	Offshore hump (22 ft)	Jigging spoon vertical, Tube jig (smelt)
Fall	8 to 30 ft	midday & dusk	Sharp break (31 ft)	Casting spoon (orange/gold), Beadhead streamer
Winter	10 to 40 ft	midday & dawn	Offshore hump (22 ft)	Jigging spoon (glow/silver), Tungsten jig + plastic

Notable structure

Structure-wise the chart holds 9 features, led in depth by Deep basin at roughly 122 ft.

Deep basin: deep basin, around 122 ft
Break off the point: drop-off, around 65 ft
Main-lake point: point, around 36 ft
Secondary point: point, around 36 ft
Sharp break: drop-off, around 31 ft
Offshore hump: offshore hump, around 22 ft
Shoreline point: point, around 14 ft
Shallow bay flat: feeding flat, around 6 ft
Back-bay flat: feeding flat, around 6 ft

Common questions

How deep is Fionn Loch or Dubh Loch?

Fionn Loch or Dubh Loch is about 144 ft (44 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 Fionn Loch or Dubh Loch?

Anglers target brown trout, european perch, northern pike, arctic char on Fionn Loch or Dubh Loch. 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 Fionn Loch or Dubh Loch?

Sharp break is the top-rated area: a drop-off in about 31 ft of water that rates prime for brown trout in summer. The interactive chart above rates every spot for each species and season.

When is the best time to fish Fionn Loch or Dubh Loch?

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

Loch na Mòine Buige 3 mi · Loch Ghiuragarstidh 3 mi · Loch Kernsary or Loch na h-Airde Bige 4 mi · Loch Fada 4 mi · Loch Maree 5 mi · Lochan on Eilean Subhainn 5 mi · Loch a Bhaid-luachraich 5 mi · Loch na Sealga 6 mi · Loch Tollaidh 6 mi · Loch Garbhaig 7 mi · Lochan Fada 7 mi · Loch Bad an Sgalaig or Dubh Loch 8 mi

See how Fionn Loch or Dubh Loch 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: Highland fishing maps (242 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.