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25-acre lake in Algoma District, Ontario. The lake tops out around 30 ft. The depth data here comes from the Ontario MNRF survey of 2021 (an MNRF lake survey). The rest of this page walks each species through its year, using the map's own scoring.
Traced from the shoreline, Mystery Lake runs 25 acres with 0.9 miles of edge. Nearly circular (index 1.4), so the story is the bottom, not the bank. The shallow band under 15 ft claims about 58% of the surface — that's where the groceries are. Figure 0.3 mi of water from one end to the other, 0.2 mi at the beam. The water lies in Algoma District. The nearest mapped water is Sill Lake, 1 mi to the southwest.
The spring pattern is a shallow one: brook trout in 2 to 15 ft. Midsummer fish sit out in 10 to 30 ft before dropping to 3 to 20 ft for winter. The spot to know is Deep basin, a deep basin in about 30 ft of water that rates prime for brook trout in summer. Plan around early morning and the evening in the warm months. Summer baits: a small spoon fished deep or a trolled lake-clear wobbler + worm gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Main-lake point (2 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Deep basin (30 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (2 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Break off the point (12 ft) | Small jigging spoon, Tungsten jig + plastic |
The chart marks 4 structure features on Mystery Lake; the deepest is Deep basin at about 30 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 Mystery Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Mystery Lake is about 30 ft (9 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 2021 (an MNRF lake survey).
Anglers target brook trout on Mystery Lake.
Deep basin is the top-rated area: a deep basin in about 30 ft of water that rates prime for brook trout in summer. Every other rated spot, per species and season, is on the map above.
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 Mystery 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.
Sill Lake 1 mi · Robertson Lake 1 mi · Bone Lake 2 mi · Bojack Lake 3 mi · Pickard Lake 3 mi · Tupper Lake 4 mi · Walker Lake 5 mi · Evans Lake 5 mi · Weckstrom Lake 5 mi · Leonard Lake 6 mi · Wolfe Lake 7 mi · Legge Lake 7 mi
See how Mystery 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.