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194-acre lake in Algoma District, Ontario. The lake tops out around 50 ft. The depth data here comes from the Ontario MNRF survey of 1970, a decades-old survey (a transect sounding survey). The rest of this page walks each species through its year, using the map's own scoring.
On the chart, Astonish Lake draws 195 acres inside 5.9 miles of shoreline. That shoreline is heavily fingered (development index 3) — bays, points and pockets everywhere, which multiplies the fishable edge. About 51% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. The basin spans about 1.9 mi end to end and 0.7 mi across at its widest. You'll find it in Algoma District. For a second option, Ezma Lake lies 1 mi south.
The spring pattern is a shallow one: brook trout in 2 to 15 ft. As the season builds they drop to 10 to 30 ft, wintering in 3 to 20 ft. Top water on the chart: Break off the point, a drop-off in the 9 ft range, prime in summer. Time it for early morning and the evening. 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 (1 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Break off the point (9 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (1 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Break off the point (9 ft) | Small jigging spoon, Tungsten jig + plastic |
Astonish Lake carries 7 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 49 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 Astonish Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Astonish Lake is about 50 ft (15 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1970, a decades-old survey (a transect sounding survey).
Anglers target brook trout on Astonish Lake.
Break off the point is the top-rated area: a drop-off in about 9 ft of water that rates prime for brook trout in summer. 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 Astonish 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.
Ezma Lake 1 mi · Gaff Lake 2 mi · Upper Mace Lake 3 mi · Wilkie Lake 3 mi · Lupus Lake 3 mi · Gibberry Lake 3 mi · Bobowash Lake 3 mi · Dollyberry Lake 3 mi · Mikel Lake 3 mi · Flack Lake 4 mi · Lilypad Lake 4 mi · Hyphen Lake 4 mi
See how Astonish 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.