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Rating depth structure for lake trout.
Shared by DepthScout anglers. Exact spots stay private, always.
530-acre lake in Algoma District, Ontario. The lake tops out around 111 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.
On the chart, Blackfish Lake draws 533 acres inside 8.7 miles of shoreline. A development index of 2.7 means a maze of bays and points: far more casting targets than a round bowl of the same size. The shallow band under 15 ft claims about 45% of the surface on the model — that's where the groceries are. End to end it runs roughly 3.1 mi, about 0.5 mi across. The water lies in Algoma District. Closest neighbour on DepthScout: Carry Lake, 2 mi east of here.
The spring pattern is a shallow one: lake trout in 10 to 40 ft. As the season builds they drop to 33 to 111 ft, wintering in 20 to 80 ft. Top water on the chart: Deep basin, a deep basin in the 94 ft range, prime in summer. Time it for early morning. Summer baits: a white tube jig (deep) or a magnum spoon on downrigger gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Main-lake point (28 ft) | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 33 to 111 ft | dawn | Deep basin (94 ft) | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 10 to 50 ft | dusk & dawn | Main-lake point (28 ft) | Heavy casting spoon, Jigging rap over reefs |
| Winter | 20 to 80 ft | dawn | Break off the point (50 ft) | White tube jig, Airplane jig |
The spring pattern is a shallow one: burbot in 25 to 70 ft. As the season builds they drop to 33 to 111 ft, wintering in 15 to 60 ft. Top water on the chart: Deep basin, a deep basin in the 94 ft range, prime in summer. Time it for after dark and midday. Summer baits: a heavy jig + cut bait gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 25 to 70 ft | night & dusk | Break off the point (50 ft) | Glow jigging spoon + cut bait, Rattle bait (dark) |
| Summer | 33 to 111 ft | night & midday | Deep basin (94 ft) | Heavy jig + cut bait |
| Fall | 30 to 80 ft | night & dusk | Break off the point (50 ft) | Glow spoon + minnow head, Blade bait (slow) |
| Winter | 15 to 60 ft | night & dusk | Break off the point (50 ft) | Glow tungsten + cut bait, Rattle spoon + minnow head |
Count 6 structure marks on this chart. The deepest, Deep basin, sits near 94 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 Blackfish Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Blackfish Lake is about 111 ft (34 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 lake trout, burbot on Blackfish Lake.
Deep basin is the top-rated area: a deep basin in about 94 ft of water that rates prime for lake trout in summer. The interactive chart above rates every spot for each species and season.
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 Blackfish 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.
Carry Lake 2 mi · Ballard Lake 2 mi · Pickle Lake 4 mi · Haf L. 5 mi · Dog Lake 5 mi · Ogasiwi Lake 6 mi · Ash Lake 8 mi · Buckhorn Lake 8 mi · Bader Lake 8 mi · Shikwamkwa Lake 9 mi · Bolkow Lake 12 mi · Gee Lake 12 mi
See how Blackfish 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. 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.