Thin L. Depth Map & Fishing Spots (ON)

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Lake depth chart

Thin L., ON

Max 39 ft

Today's read

Where to start

Hopper & ant season (windward banks) window is on — see the hatch outlook

Hatch outlook

Hopper & ant season (windward banks)Active window

Typical here: Jul 1 – Sep 15 · hoppers peak July–August; winged-ant falls show up on warm humid afternoons — a wind event, not a hatch

adultwarm, breezy afternoons, roughly 1–5pm — slap the imitation down hard — the splat is the trigger — then wait; count to three after the rise before setting

Work the windward bank on breezy summer afternoons — that's where the food is. Casting-bubble-and-hopper is the direct translation; otherwise run small topwaters and inline spinners tight along the grass edges and blowdown banks in the afternoon warmth.

The event happens over windward grassy banks, overhanging brush and blowdowns — wherever the breeze dumps the bugs

Next on this water

Spring bug season (brook trout lakes) · forageApr 25 – Jun 30 · in ~8 months

Hex (giant mayfly) · mayflyMay 25 – Aug 10 · in ~9 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.

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Recent catches at Thin L.

Shared by DepthScout anglers. Exact spots stay private, always.

No shared catches here yet — be the first.Log a catch from the map above and share it to put Thin L. on the board.

Fishing Thin L.: what the data says

94-acre lake in Algoma District, Ontario. The lake tops out around 39 ft. Depth here is modeled from the true shoreline and max depth rather than surveyed; use it to plan, not to navigate. Every species below gets its seasonal read from the same numbers driving the chart.

The drawn water covers 94 acres wrapped in 5.1 miles of bank. An index of 3.8 puts the bank firmly in maze territory: point after pocket after cove, every one a casting target. The shallow band under 15 ft claims about 86% of the surface on the model — that's where the groceries are. Tip to tip the water measures near 2.1 mi with a 0.3-mi widest point. Algoma District claims this one. Its nearest charted neighbour, Mewburn Lake, is 4 mi to the southwest.

Brook Trout fishing at Thin L.

Spring brook trout on Thin L. hold shallow, usually 2 to 15 ft. They move out to 10 to 30 ft in summer and finish the year down in 3 to 20 ft. Put Break off the point first on the milk run — a drop-off near 18 ft that grades prime for summer. The feeding windows run early morning and the evening. The summer box starts with a small spoon fished deep or a trolled lake-clear wobbler + worm.

Season	Depth	Best window	Start at	Go-to baits
Spring	2 to 15 ft	dawn & dusk	Main-lake point (10 ft)	Small inline spinner (gold), Tiny spoon
Summer	10 to 30 ft	dawn & dusk	Break off the point (18 ft)	Small spoon fished deep, Trolled lake-clear wobbler + worm
Fall	2 to 15 ft	midday & dawn	Main-lake point (10 ft)	Small spoon (orange), Spinner
Winter	3 to 20 ft	dawn	Break off the point (18 ft)	Small jigging spoon, Tungsten jig + plastic

Notable structure

Count 6 structure marks on this chart. The deepest, Deep basin, sits near 33 ft.

Deep basin: deep basin, around 33 ft
Break off the point: drop-off, around 18 ft
Main-lake point: point, around 10 ft
Secondary point: point, around 10 ft
Shallow bay flat: weed flat, around 5 ft
Back-bay flat: weed flat, around 5 ft

Thin L. fishing regulations

Season dates, license requirements, and size and bag limits for Ontario waters are set by the Ontario fishing regulations (FMZ summary) — and special regulations can apply to Thin L. specifically, so confirm the current rules before you fish.

Check the official Ontario fishing regulations →

Common questions

How deep is Thin L.?

Thin L. is about 39 ft (12 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 Thin L.?

Anglers target brook trout on Thin L..

Where is the best fishing spot on Thin L.?

Break off the point is the top-rated area: a drop-off in about 18 ft of water that rates prime for brook trout in summer. Every other rated spot, per species and season, is on the map above.

When is the best time to fish Thin L.?

For brook trout, the summer bite is best in early morning and the evening. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.

What are the fishing regulations for Thin L.?

Fishing on Thin L. is regulated by the Ontario fishing regulations (FMZ summary). Check the official Ontario regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.

Nearby waters

Mewburn Lake 4 mi · Slender Lake 4 mi · Kindiogami Lake 5 mi · Daystar Lake 6 mi · Runaway L. 7 mi · Gibby L. 7 mi · Doehead Lake 7 mi · Fox L. 7 mi · Goodlookin Lake 7 mi · Burnt Lake 7 mi · Bierce Lake 8 mi · Bitstock Lake 8 mi

See how Thin L. stacks up: best brook trout lakes in Ontario

More water nearby: Algoma District fishing maps (1026 charts). Browse all Ontario fishing maps or 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.