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Rating depth structure for brook trout.
Recent public catches load as you reach this section.
56-acre lake in Thunder Bay District, Ontario. The lake tops out around 78 ft. The chart is a model: real shoreline, published maximum depth, interpolated in between. A planning tool, never a navigation product. Here is how the season plays out for each species, straight from the data behind the map.
Drawn out, this is 56 acres of water rimmed by 3.2 miles of bank. An index of 3 puts the bank firmly in maze territory: point after pocket after cove, every one a casting target. Littoral water — the productive band under ~15 ft — makes up 60% of this chart, as modeled. The basin spans about 1.1 mi end to end and 0.5 mi across at its widest. You'll find it in Thunder Bay District. The nearest mapped water is Bishops Lake, 1 mi to the northeast.
Start shallow in spring: brook trout sit in 2 to 15 ft that time of year. Summer pushes them deeper, 10 to 30 ft, and winter fish settle into 3 to 20 ft. The spot to know is Shallow bay flat, a weed flat in about 6 ft of water that rates good for brook trout in spring. Warm-month bites cluster around early morning and the evening. Throw a small spoon fished deep or a trolled lake-clear wobbler + worm until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Shallow bay flat (6 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Break off the point (35 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | open water | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Shallow bay flat (6 ft) | Small jigging spoon, Tungsten jig + plastic |
Start shallow in spring: burbot sit in 25 to 70 ft that time of year. Warm water sends them out to 23 to 78 ft; cold water stacks them in 15 to 60 ft. Top water on the chart: Deep basin, a deep basin in the 66 ft range, prime in spring. Fish it in after dark and midday and you'll meet the bite. Throw a heavy jig + cut bait 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 | 25 to 70 ft | night & dusk | Deep basin (66 ft) | Glow jigging spoon + cut bait, Rattle bait (dark) |
| Summer | 23 to 78 ft chart-limited; documented 50 to 120 ft | night & midday | Deep basin (66 ft) | Heavy jig + cut bait |
| Fall | 23 to 78 ft chart-limited; documented 30 to 80 ft | night & dusk | Deep basin (66 ft) | Glow spoon + minnow head, Blade bait (slow) |
| Winter | 15 to 60 ft | night & dusk | Deep basin (66 ft) | Glow tungsten + cut bait, Rattle spoon + minnow head |
Structure-wise the chart holds 6 features, led in depth by Deep basin at roughly 66 ft.
Access data: Geospatial Ontario - Fishing Access Points. Confirm conditions and fees locally before you launch.
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 Cavern Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Cavern Lake is about 78 ft (24 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.
Anglers target brook trout, burbot on Cavern Lake.
Deep basin is the top-rated area: a deep basin in about 66 ft of water that rates prime for burbot in spring. The interactive chart above rates every spot for each species and season.
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.
Fishing on Cavern Lake 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.
Bishops Lake 1 mi · Innes Lake 2 mi · Welburn Lake 3 mi · Wiggins Lake 3 mi · Miner Lake 3 mi · Fall Lake 3 mi · Bat Lake 3 mi · Golden Gate Lake 3 mi · Billy Lake 4 mi · Furcate Lake 5 mi · Nolan Lake 6 mi · Himdick Lake 6 mi
See how Cavern Lake stacks up: best brook trout lakes in Ontario · best burbot lakes in Ontario
More water nearby: Thunder Bay District fishing maps (662 charts). Browse all Ontario 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.