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Rating depth structure for brook trout.
Recent public catches load as you reach this section.
59-acre lake in Thunder Bay District, Ontario. The lake tops out around 34 ft. What you see is a modeled chart: the shoreline is real, the max depth is published, and the contours between are estimated. Plan with it; don't navigate by it. The season-by-season read for each species follows, from the map's own numbers.
Drawn out, this is 59 acres of water rimmed by 2.4 miles of bank. That shoreline is heavily fingered (development index 2.2) — bays, points and pockets everywhere, which multiplies the fishable edge. Littoral water — the productive band under ~15 ft — makes up 66% of this chart, as modeled. Tip to tip the water measures near 0.8 mi with a 0.3-mi widest point. You'll find it in Thunder Bay District. The nearest mapped water is Antler Lake, 4 mi to the southwest.
In spring, brook trout run shallow here, mostly 2 to 15 ft. Summer pushes them deeper, 10 to 30 ft, and winter fish settle into 3 to 20 ft. Deep basin is the standout, a deep basin at roughly 29 ft, rated prime for summer brook trout. Time it for early morning and the evening. You won't need more than a small spoon fished deep or a trolled lake-clear wobbler + worm most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Main-lake point (9 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Deep basin (29 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (9 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Break off the point (15 ft) | Small jigging spoon, Tungsten jig + plastic |
Spring puts burbot in skinny water — 10 to 34 ft is the zone. Summer fish stay in 10 to 34 ft, and winter fish hold in 9 to 34 ft. Deep basin is the standout, a deep basin at roughly 29 ft, rated prime for spring burbot. Plan around after dark and midday in the warm months. A heavy jig + cut bait covers the summer program.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 34 ft chart-limited; documented 25 to 70 ft | night & dusk | Deep basin (29 ft) | Glow jigging spoon + cut bait, Rattle bait (dark) |
| Summer | 10 to 34 ft chart-limited; documented 50 to 120 ft | night & midday | Deep basin (29 ft) | Heavy jig + cut bait |
| Fall | 10 to 34 ft chart-limited; documented 30 to 80 ft | night & dusk | Deep basin (29 ft) | Glow spoon + minnow head, Blade bait (slow) |
| Winter | 9 to 34 ft chart-limited; documented 15 to 60 ft | night & dusk | Deep basin (29 ft) | Glow tungsten + cut bait, Rattle spoon + minnow head |
6 pieces of structure are mapped here — Deep basin, around 29 ft, is the deepest of them.
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 Ambrose Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Ambrose Lake is about 34 ft (10 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, burbot on Ambrose Lake.
Deep basin is the top-rated area: a deep basin in about 29 ft of water that rates prime for burbot in spring. 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 Ambrose 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.
Antler Lake 4 mi · Deep Lake 5 mi · Bluff Lake 6 mi · Crosman Lake 7 mi · Big Duck Lake 7 mi · Davidson Lake 10 mi · Ducell Lake 10 mi · Chapman Lake 12 mi · Found Lake 12 mi · Ault Lake 12 mi · Craig Lake 13 mi · Flicker Lake 13 mi
See how Ambrose Lake stacks up: best brook trout lakes in Ontario · best burbot lakes in Ontario
More water nearby: Thunder Bay District fishing maps (662 charts). Browse all Ontario fishing maps. 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.