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Shared by DepthScout anglers. Exact spots stay private, always.
77-acre lake in Algoma District, Ontario. The lake tops out around 95 ft. Bathymetry on this water is estimated from its real outline and maximum depth. Use it to shortlist water, then verify with your electronics — and never navigate by it. What follows comes from the same scoring engine that paints the spots above.
Old Man Lake maps at 78 acres behind 3.4 miles of shoreline. With a shoreline index of 2.7, this water is all arms and coves — edge habitat well beyond its acreage. Littoral water — the productive band under ~15 ft — makes up 62% of this chart, as modeled. Tip to tip the water measures near 0.8 mi with a 0.4-mi widest point. It sits in Algoma District. Its nearest charted neighbour, Old Woman Lake, is 1 mi to the east.
When the water first warms, brook trout slide up into 2 to 15 ft. By summer they slide out to 10 to 30 ft, and by winter most fish are in 3 to 20 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 6 ft that scores good in spring. In summer the feeding windows fall in early morning and the evening. Keep a small spoon fished deep or a trolled lake-clear wobbler + worm rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Shallow bay flat (6 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 (6 ft) | Small jigging spoon, Tungsten jig + plastic |
The chart marks 6 structure features on Old Man Lake; the deepest is Deep basin at about 81 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 Old Man Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Old Man Lake is about 95 ft (29 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 brook trout on Old Man Lake.
Shallow bay flat is the top-rated area: a weed flat in about 6 ft of water that rates good for brook trout in spring. The map above holds the full rated-spot list for every 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 Man 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.
Old Woman Lake 1 mi · Martin Lake 2 mi · Wart Lake 2 mi · Spider L. 2 mi · Mongoose Lake 4 mi · Spruce Lake 5 mi · Quintet Lakes 6 mi · Tribble Lake 6 mi · Grey Owl Lake 7 mi · Meenach Lake 7 mi · Gavor Lake 7 mi · Carpenter Lake 8 mi
See how Old Man 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. 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.