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Rating depth structure for brook trout.
Recent public catches load as you reach this section.
74-acre lake in Algoma District, Ontario. The lake tops out around 33 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 the data behind the map says about each species, season by season:
Drawn out, this is 75 acres of water rimmed by 4 miles of bank — 2 islands included. The 3.3 development index tells the story — a convoluted bank whose fishable edge far outruns the acreage. The shallow band under 15 ft claims about 74% of the surface — that's where the groceries are. Figure 1.6 mi of water from one end to the other, 0.2 mi at the beam. The water lies in Algoma District. Closest neighbour on DepthScout: Thin L., 4 mi northwest of here.
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.
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 Main-lake point, a point in about 14 ft of water that rates prime for brook trout in spring. 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 | Main-lake point (14 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Deep basin (32 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (14 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Break off the point (8 ft) | Small jigging spoon, Tungsten jig + plastic |
The chart marks 6 structure features on Slender Lake; the deepest is Deep basin at about 32 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 Slender Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Slender Lake is about 33 ft (10 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 Slender Lake.
Main-lake point is the top-rated area: a point in about 14 ft of water that rates prime for brook trout in spring. The map above holds the full rated-spot list for every 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 Slender 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.
Thin L. 4 mi · Flag Lake 4 mi · Kindiogami Lake 5 mi · Crain Lake 5 mi · Fox L. 5 mi · Mewburn Lake 6 mi · Bierce Lake 6 mi · Runaway L. 6 mi · Gibby L. 6 mi · Beyond Lake 7 mi · Kelsie Lake 7 mi · Oval Lake 7 mi
See how Slender Lake stacks up: best brook trout lakes in Ontario
More water nearby: Algoma District fishing maps (1026 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.