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657-acre lake in Algoma District, Ontario. The lake tops out around 140 ft. The depth data here comes from the Ontario MNRF survey of 1971, a decades-old survey (a transect sounding survey). What the data behind the map says about each species, season by season:
The drawn water covers 659 acres wrapped in 13.7 miles of bank — 5 islands included. The 3.8 development index tells the story — a convoluted bank whose fishable edge far outruns the acreage. Roughly 19% of the water is 15 ft or less, the band where the food chain lives. The basin spans about 3.1 mi end to end and 0.9 mi across at its widest. Algoma District claims this one. If the bite dies, Black Lake is 2 mi to the south.
Spring brook trout on Old Woman Lake hold shallow, usually 2 to 15 ft. They move out to 10 to 30 ft in summer and finish the year down in 3 to 20 ft. Put Shallow bay flat first on the milk run — a feeding flat near 2 ft that grades good for spring. The feeding windows run early morning and the evening. The summer box starts with a small spoon fished deep or a trolled lake-clear wobbler + worm.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Shallow bay flat (2 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 | Back-bay flat (10 ft) | Small jigging spoon, Tungsten jig + plastic |
Come spring, look for lake trout tight to the bank in 10 to 40 ft. They move out to 50 to 120 ft in summer and finish the year down in 20 to 80 ft. If you only fish one area, make it Main-lake point: a point around 31 ft that scores prime in spring. Best bite is early morning. A white tube jig (deep) or a magnum spoon on downrigger is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Main-lake point (31 ft) | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 50 to 120 ft | dawn | Break off the point (74 ft) | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 10 to 50 ft | dusk & dawn | Main-lake point (31 ft) | Heavy casting spoon, Jigging rap over reefs |
| Winter | 20 to 80 ft | dawn | Break off the point (74 ft) | White tube jig, Airplane jig |
Old Woman Lake carries 7 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 140 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 Old Woman Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Old Woman Lake is about 140 ft (43 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1971, a decades-old survey (a transect sounding survey).
Anglers target brook trout, lake trout on Old Woman Lake.
Main-lake point is the top-rated area: a point in about 31 ft of water that rates prime for lake trout in spring. Scroll up to the map for the complete spot list by 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 Old Woman 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.
Black Lake 2 mi · Gamitagama Lake 3 mi · Mash Lake 3 mi · Hardtime Lake 3 mi · Dead Otter Lake 4 mi · Wabigoon Lake 4 mi · Viridian Lake 4 mi · Wildcat Lake 5 mi · White Spruce Lake 5 mi · Mijinemungshing Lake 5 mi · Baldhead Lake 6 mi · Belanger Lake 6 mi
See how Old Woman Lake stacks up: best lake trout lakes in Ontario · 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.