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481-acre lake in Algoma District, Ontario. The lake tops out around 40 ft. The depth data here comes from the Ontario MNRF survey of 1966, a decades-old survey (a transect sounding survey). Here is how the season plays out for each species, straight from the data behind the map.
On the chart, Upper Mace Lake draws 483 acres inside 13.2 miles of shoreline — 17 islands included. With a shoreline index of 4.3, this water is all arms and coves — edge habitat well beyond its acreage. About 60% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. The basin spans about 2.1 mi end to end and 1.1 mi across at its widest. You'll find it in Algoma District. The nearest mapped water is Gaff Lake, 1 mi to the north.
Start shallow in spring: lake trout sit in 10 to 40 ft that time of year. They don't go far with the seasons — 12 to 40 ft covers summer, 10 to 40 ft covers winter. Top water on the chart: Deep basin, a deep basin in the 40 ft range, prime in summer. Fish it in early morning and you'll meet the bite. Throw a white tube jig (deep) or a magnum spoon on downrigger until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Break off the point (29 ft) | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 12 to 40 ft | dawn | Deep basin (40 ft) | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 8 to 40 ft | dusk & dawn | Secondary point (7 ft) | Heavy casting spoon, Jigging rap over reefs |
| Winter | 10 to 40 ft | dawn | Deep basin (40 ft) | White tube jig, Airplane jig |
The spring pattern is a shallow one: splake in 5 to 25 ft. Midsummer fish sit out in 12 to 40 ft before dropping to 9 to 40 ft for winter. The spot to know is Break off the point, a drop-off in about 29 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 | Secondary point (7 ft) | Small casting spoon (gold/orange), Inline spinner |
| Summer | 12 to 40 ft | dawn & dusk | Break off the point (29 ft) | Trolled spoon at the thermocline, White tube jig (deep) |
| Fall | 10 to 35 ft | dawn & dusk | Break off the point (29 ft) | Casting spoon, Jerkbait |
| Winter | 9 to 40 ft | dawn | Break off the point (29 ft) | Jigging spoon tipped with minnow head, Small white tube |
Structure-wise the chart holds 7 features, led in depth by Deep basin at roughly 40 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 Upper Mace Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Upper Mace Lake is about 40 ft (12 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1966, a decades-old survey (a transect sounding survey).
Anglers target lake trout, splake on Upper Mace Lake.
Deep basin is the top-rated area: a deep basin in about 40 ft of water that rates prime for lake trout in summer. Every other rated spot, per species and season, is on the map above.
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 Upper Mace 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.
Gaff Lake 1 mi · Ezma Lake 2 mi · Lupus Lake 2 mi · Lilypad Lake 2 mi · Astonish Lake 3 mi · Lower Mace Lake 3 mi · Lillybet Lake 3 mi · Keelor Lake 4 mi · Pathfinder Lake 4 mi · Lost Eye Lake 4 mi · Claim Lake 4 mi · Gibberry Lake 4 mi
See how Upper Mace Lake stacks up: best lake trout lakes in Ontario · 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.