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116-acre lake in Algoma District, Ontario. The lake tops out around 92 ft. The depth data here comes from the Ontario MNRF survey of 1982 (a transect sounding survey). The season-by-season read for each species follows, from the map's own numbers.
The outline encloses 117 acres, worked by 3.5 miles of shoreline — one island included. A development index of 2.3 means a maze of bays and points: far more casting targets than a round bowl of the same size. Roughly 36% of the water is 15 ft or less, the band where the food chain lives. Tip to tip the water measures near 1.3 mi with a 0.3-mi widest point. It sits in Algoma District. East Caribou Lake sits 1 mi north — the closest neighbouring chart.
When the water first warms, lake trout slide up into 10 to 40 ft. By summer they slide out to 28 to 92 ft, and by winter most fish are in 20 to 80 ft. If you only fish one area, make it Deep basin: a deep basin around 92 ft that scores prime in summer. In summer the feeding windows fall in early morning. Keep a white tube jig (deep) or a magnum spoon on downrigger rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Main-lake point (11 ft) | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 28 to 92 ft | dawn | Deep basin (92 ft) | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 10 to 50 ft | dusk & dawn | Main-lake point (11 ft) | Heavy casting spoon, Jigging rap over reefs |
| Winter | 20 to 80 ft | dawn | Break off the point (25 ft) | White tube jig, Airplane jig |
When the water first warms, burbot slide up into 25 to 70 ft. By summer they slide out to 28 to 92 ft, and by winter most fish are in 15 to 60 ft. If you only fish one area, make it Deep basin: a deep basin around 92 ft that scores prime in summer. In summer the feeding windows fall in after dark and midday. Keep a heavy jig + cut bait rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 25 to 70 ft | night & dusk | Break off the point (25 ft) | Glow jigging spoon + cut bait, Rattle bait (dark) |
| Summer | 28 to 92 ft | night & midday | Deep basin (92 ft) | Heavy jig + cut bait |
| Fall | 30 to 80 ft | night & dusk | Deep basin (92 ft) | Glow spoon + minnow head, Blade bait (slow) |
| Winter | 15 to 60 ft | night & dusk | Break off the point (25 ft) | Glow tungsten + cut bait, Rattle spoon + minnow head |
Castra Lake carries 6 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 92 ft down.
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 Castra Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Castra Lake is about 92 ft (28 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1982 (a transect sounding survey).
Anglers target lake trout, burbot on Castra Lake.
Deep basin is the top-rated area: a deep basin in about 92 ft of water that rates prime for lake trout in summer. Every other rated spot, per species and season, is on the map above.
For lake trout, the summer bite is best in early morning. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Castra 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.
East Caribou Lake 1 mi · Pearl Lake 1 mi · Highland Lake 2 mi · Bridge Lake 2 mi · Hoover Lake 2 mi · Varley Lake 2 mi · Post L. 2 mi · Narvik Lake 2 mi · McKinney L. 3 mi · Mud Lake 3 mi · Skirl Lake 3 mi · Irene Parlby L. 3 mi
See how Castra Lake stacks up: best lake trout lakes in Ontario · best burbot lakes in Ontario
More water nearby: Algoma District fishing maps (1026 charts). Browse all Ontario fishing maps or see every water on DepthScout. Bathymetry credit: state fisheries survey programs. 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.