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20-acre lake in Algoma District, Ontario. The lake tops out around 59 ft. The depth chart comes from Ontario Ministry of Natural Resources and Forestry bathymetric survey data, so the contours are survey-derived rather than computer-modeled. The depth data here comes from the Ontario MNRF survey of 1979, a decades-old survey (a transect sounding survey). Every species below gets its seasonal read from the same numbers driving the chart.
Traced from the shoreline, Bouck L. 21 runs 20 acres with 1.4 miles of edge. The 2.2 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 40% of this chart. The basin spans about 0.3 mi end to end and 0.3 mi across at its widest. The water lies in Algoma District. For a second option, Flag Lake lies 0 mi west.
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 Break off the point, a drop-off in about 31 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 | Shallow bay flat (3 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Break off the point (31 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | open water | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Shallow bay flat (3 ft) | Small jigging spoon, Tungsten jig + plastic |
The chart marks 4 structure features on Bouck L. 21; the deepest is Deep basin at about 53 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 Bouck L. 21 specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Bouck L. 21 is about 59 ft (18 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1979, a decades-old survey (a transect sounding survey).
Anglers target brook trout on Bouck L. 21.
Break off the point is the top-rated area: a drop-off in about 31 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 Bouck L. 21 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.
Flag Lake 0 mi · Cinder Lake 1 mi · Gander Lake 1 mi · Rye Lake 1 mi · Mellon Lake 1 mi · Gunterman L. 1 2 mi · Manydace L. 2 mi · Gunterman L. 8 2 mi · Evans Lake 3 mi · Link Lake 3 mi · Gunterman L. 19 3 mi · Banana Lake 3 mi
See how Bouck L. 21 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: published agency survey data. 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.