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90-acre lake in Algoma District, Ontario. The lake tops out around 128 ft. The depth data here comes from the Ontario MNRF survey of 1967, a decades-old survey (a transect sounding survey). Here's the year, species by species, as the scoring engine sees it.
Portage Lake maps at 90 acres behind 2.4 miles of shoreline. With a 1.8 development index there's bank structure worth casting at, in moderation. Littoral water — the productive band under ~15 ft — makes up 11% of this chart. Figure 0.8 mi of water from one end to the other, 0.4 mi at the beam. Algoma District claims this one. Its nearest charted neighbour, Doc Hamill L., is 0 mi to the south.
Early season brook trout use the shallows, holding in 2 to 15 ft. Summer is a 10 to 30 ft game here, winter a 3 to 20 ft one. The chart's best answer is Shallow bay flat — feeding flat, 3 ft, good for spring. Best bite is early morning and the evening. Tie on a small spoon fished deep or a trolled lake-clear wobbler + worm and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Shallow bay flat (3 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | open water | 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 (3 ft) | Small jigging spoon, Tungsten jig + plastic |
Structure-wise the chart holds 6 features, led in depth by Deep basin at roughly 127 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 Portage Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Portage Lake is about 128 ft (39 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1967, a decades-old survey (a transect sounding survey).
Anglers target brook trout on Portage Lake.
Shallow bay flat is the top-rated area: a feeding flat in about 3 ft of water that rates good for brook trout in spring. Open the map above to see every rated 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 Portage 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 · Makela L. 1 mi · Boundary Lake 1 mi · Black Lake 1 mi · Platypus L. 1 mi · Stinkfish Lake 1 mi · Regan Lake 2 mi · Willisam Lake 2 mi · Trottingfox Lake 2 mi · Geoff Bernardo L. 2 mi · Radenhurst Lake 2 mi · Bayview Lake 2 mi
See how Portage Lake 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. 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.