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Rating depth structure for brook trout.
Recent public catches load as you reach this section.
184-acre lake in Thunder Bay District, Ontario. The lake tops out around 82 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 1987 (a transect sounding survey). What follows comes from the same scoring engine that paints the spots above.
The outline encloses 185 acres, worked by 2.2 miles of shoreline, with a single island in the mix. The basin is a simple one (shoreline index 1.2) — close to a bowl, so the structure on the chart matters more than the bank. Roughly 34% of the water is 15 ft or less, the band where the food chain lives. Call it 0.7 mi long by 0.5 mi wide at the broadest reach. It sits in Thunder Bay District. If the bite dies, Wolfpup Lake is 3 mi to the southeast.
These fish are listed in an exact-water agency record as forage or ecological context. They are not target-species profiles and do not affect DepthScout's Prime, Good, or Fair spot ratings.
Official Ontario MNRF Fish ON-Line record. The listing documents source-recorded presence, not present abundance or guaranteed catchability.
Come spring, look for brook trout tight to the bank in 2 to 15 ft. Expect a summer slide to 10 to 30 ft, then a winter hold in 3 to 20 ft. Start at Main-lake point. It's a point holding about 9 ft of water and rates prime come spring. Prime time lands in early morning and the evening. A small spoon fished deep or a trolled lake-clear wobbler + worm is the honest summer answer here.
| 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 | Break off the point (34 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 | Back-bay flat (3 ft) | Small jigging spoon, Tungsten jig + plastic |
Count 6 structure marks on this chart. The deepest, Deep basin, sits near 78 ft.
Access data: Geospatial Ontario - Fishing Access Points; Government of Ontario - MNR Unpatented Crown Land Shoreline; Government of Ontario - MNR Unpatented Crown Land Shoreline. 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 Unknown Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Unknown Lake is about 82 ft (25 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1987 (a transect sounding survey).
Anglers target brook trout on Unknown Lake.
Main-lake point is the top-rated area: a point in about 9 ft of water that rates prime for brook trout in spring. The interactive chart above rates every 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 Unknown 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.
Wolfpup Lake 3 mi · Cliff Lake 5 mi · Black Mountain Lake 5 mi · Pringle Lake 5 mi · Moraine Lake 6 mi · Little Moraine Lake 6 mi · Golden Gate Lake 7 mi · Elm Lake 7 mi · Anders Lake 9 mi · Driftstone Lake 10 mi · Bishops Lake 10 mi · Stewart Lake 10 mi
See how Unknown Lake stacks up: best brook trout lakes in Ontario
More water nearby: Thunder Bay District fishing maps (662 charts). Browse all Ontario fishing maps. 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.