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207-acre lake in Algoma District, Ontario. The lake tops out around 138 ft. The depth data here comes from the Ontario MNRF survey of 2022 (an MNRF lake survey). Species by species, here's what the data says the year looks like.
Traced from the shoreline, Fern Lake runs 207 acres with 5.2 miles of edge — 3 islands included. That shoreline is heavily fingered (development index 2.6) — bays, points and pockets everywhere, which multiplies the fishable edge. Littoral water — the productive band under ~15 ft — makes up 22% of this chart. Tip to tip the water measures near 1.5 mi with a 0.7-mi widest point. The water lies in Algoma District. For a second option, Paquette Lake lies 2 mi northwest.
In spring, brook trout run shallow here, mostly 2 to 15 ft. Midsummer fish sit out in 10 to 30 ft before dropping to 3 to 20 ft for winter. Spring brook trout concentrate at Main-lake point, a prime-rated point around 8 ft. Fish it in early morning and the evening and you'll meet the bite. 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 (8 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 | Main-lake point (8 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Shallow bay flat (2 ft) | Small jigging spoon, Tungsten jig + plastic |
Spring puts lake trout in skinny water — 10 to 40 ft is the zone. As the season builds they drop to 50 to 120 ft, wintering in 20 to 80 ft. Spring lake trout concentrate at Secondary point, a prime-rated point around 36 ft. Warm-month bites cluster around early morning. A white tube jig (deep) or a magnum spoon on downrigger covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Secondary point (36 ft) | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 50 to 120 ft | dawn | Break off the point (69 ft) | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 10 to 50 ft | dusk & dawn | Secondary point (36 ft) | Heavy casting spoon, Jigging rap over reefs |
| Winter | 20 to 80 ft | dawn | Break off the point (69 ft) | White tube jig, Airplane jig |
6 pieces of structure are mapped here — Deep basin, around 138 ft, is the deepest of them.
Access data: Land Information Ontario — Fishing Access Point. Confirm conditions and fees locally before you launch.
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 Fern Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Fern Lake is about 138 ft (42 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 2022 (an MNRF lake survey).
Anglers target brook trout, lake trout on Fern Lake.
Secondary point is the top-rated area: a point in about 36 ft of water that rates prime for lake trout in spring. Scroll up to the map for the complete spot list by 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 Fern 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.
Paquette Lake 2 mi · Castleman Lake 3 mi · Boat Lake 3 mi · Strums Lake 3 mi · Vixen Lake 4 mi · Deer Lake 4 mi · Whitman Lake 4 mi · Metivier Lake 4 mi · Leishman Lake 5 mi · Devil's Lake 5 mi · Roussain Lake 5 mi · Garden Lake 8 mi
See how Fern Lake stacks up: best lake trout lakes in Ontario · 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.