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43-acre lake in Algoma District, Ontario. The lake tops out around 79 ft. The depth data here comes from the Ontario MNRF survey of 1982 (a transect sounding survey). Every species below gets its seasonal read from the same numbers driving the chart.
Traced from the shoreline, Boundary Lake runs 44 acres with 1.5 miles of edge. Index 1.6 on the shoreline: a few honest points and pockets, nothing labyrinthine. Littoral water — the productive band under ~15 ft — makes up 35% of this chart. Call it 0.6 mi long by 0.2 mi wide at the broadest reach. You'll find it in Algoma District. Closest neighbour on DepthScout: Doc Hamill L., 0 mi northeast of here.
The spring pattern is a shallow one: splake in 5 to 25 ft. Midsummer fish sit out in 25 to 60 ft before dropping to 10 to 45 ft for winter. The spot to know is Break off the point, a drop-off in about 32 ft of water that rates prime for splake in summer. Plan around early morning and the evening in the warm months. Summer baits: a trolled spoon at the thermocline or a white tube jig (deep) gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 25 ft | dawn & dusk | Main-lake point (8 ft) | Small casting spoon (gold/orange), Inline spinner |
| Summer | 25 to 60 ft | dawn & dusk | Break off the point (32 ft) | Trolled spoon at the thermocline, White tube jig (deep) |
| Fall | 10 to 35 ft | dawn & dusk | Main-lake point (8 ft) | Casting spoon, Jerkbait |
| Winter | 10 to 45 ft | dawn | Break off the point (32 ft) | Jigging spoon tipped with minnow head, Small white tube |
Count 5 structure marks on this chart. The deepest, Deep basin, sits near 77 ft.
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 Boundary Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Boundary Lake is about 79 ft (24 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1982 (a transect sounding survey).
Anglers target splake on Boundary Lake.
Break off the point is the top-rated area: a drop-off in about 32 ft of water that rates prime for splake in summer. The map above holds the full rated-spot list for every species and season.
For splake, 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 Boundary 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.
Doc Hamill L. 0 mi · Portage Lake 1 mi · Regan Lake 1 mi · Makela L. 1 mi · Geoff Bernardo L. 1 mi · Stinkfish Lake 2 mi · Black Lake 2 mi · Trottingfox Lake 2 mi · Westman L. 2 mi · Regal Lake 2 mi · Platypus L. 2 mi · Bayview Lake 2 mi
See how Boundary Lake stacks up: best splake 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.