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169-acre lake in Algoma District, Ontario. The lake tops out around 85 ft. The depth data here comes from the Ontario MNRF survey of 1977, 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.
Traced from the shoreline, Dossier Lake runs 169 acres with 5.7 miles of edge, with a single island in the mix. The 3.1 development index tells the story — a convoluted bank whose fishable edge far outruns the acreage. Littoral water — the productive band under ~15 ft — makes up 44% of this chart. Figure 1.2 mi of water from one end to the other, 0.7 mi at the beam. The water lies in Algoma District. The nearest mapped water is Little Dossier Lake, 1 mi to the north.
Start shallow in spring: brook trout sit in 2 to 15 ft that time of year. Warm water sends them out to 10 to 30 ft; cold water stacks them in 3 to 20 ft. Top water on the chart: Break off the point, a drop-off in the 10 ft range, prime in summer. Fish it in early morning and the evening and you'll meet the bite. Throw a small spoon fished deep or a trolled lake-clear wobbler + worm until the fish tell you otherwise.
| 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 | Break off the point (10 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 (10 ft) | Small jigging spoon, Tungsten jig + plastic |
The chart marks 6 structure features on Dossier Lake; the deepest is Deep basin at about 81 ft.
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 Dossier Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Dossier Lake is about 85 ft (26 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1977, a decades-old survey (a transect sounding survey).
Anglers target brook trout on Dossier Lake.
Break off the point is the top-rated area: a drop-off in about 10 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 Dossier 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.
Little Dossier Lake 1 mi · Almonte Lake 2 mi · Baldhead Lake 3 mi · Peller Lake 4 mi · Mijinemungshing Lake 4 mi · Maquon Lake 5 mi · Ear Lake 5 mi · Colette Lake 5 mi · Wabigoon Lake 5 mi · Rabbit Blanket Lake 6 mi · Gamitagama Lake 7 mi · Foam Lake 7 mi
See how Dossier 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.