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18-acre lake in Algoma District, Ontario. The lake tops out around 39 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 2021 (an MNRF lake survey). What the data behind the map says about each species, season by season:
The drawn water covers 18 acres wrapped in 0.9 miles of bank. With a 1.5 development index there's bank structure worth casting at, in moderation. The shallow band under 15 ft claims about 73% of the surface — that's where the groceries are. Call it 0.3 mi long by 0.2 mi wide at the broadest reach. It sits in Algoma District. If the bite dies, Smilsky L. 3 is 0 mi to the northeast.
Spring brook trout on Smilsky L. 4 hold shallow, usually 2 to 15 ft. By summer they slide out to 10 to 30 ft, and by winter most fish are in 3 to 20 ft. The chart's best answer is Break off the point — drop-off, 19 ft, prime for summer. Prime time lands in early morning and the evening. The summer box starts with a small spoon fished deep or a trolled lake-clear wobbler + worm.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Main-lake point (4 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Break off the point (19 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (4 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Break off the point (19 ft) | Small jigging spoon, Tungsten jig + plastic |
Count 4 structure marks on this chart. The deepest, Deep basin, sits near 38 ft.
Access data: Geospatial Ontario - Fishing Access Points. 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 Smilsky L. 4 specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Smilsky L. 4 is about 39 ft (12 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 2021 (an MNRF lake survey).
Anglers target brook trout on Smilsky L. 4.
Break off the point is the top-rated area: a drop-off in about 19 ft of water that rates prime for brook trout in summer. 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 Smilsky L. 4 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.
Smilsky L. 3 0 mi · Huff Lake 3 mi · Smilsky Lake 11 3 mi · Queminico Lake 3 mi · Bow Lake 3 mi · Caysee Lake 4 mi · Negick Lake 5 mi · Joco Lake 5 mi · West Joco Lake 5 mi · Islay Lake 5 mi · Kenny Lake 6 mi · Crescent Lake 6 mi
See how Smilsky L. 4 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.