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Shared by DepthScout anglers. Exact spots stay private, always.
99-acre lake in Sudbury District, Ontario. The lake tops out around 30 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. What follows comes from the same scoring engine that paints the spots above.
The outline encloses 99 acres, worked by 2.5 miles of shoreline. A middling shoreline index (1.8) gives it some bays to work without being a maze. The shallow band under 15 ft claims about 54% of the surface — that's where the groceries are. Tip to tip the water measures near 0.7 mi with a 0.5-mi widest point. Sudbury District claims this one. If the bite dies, Gilbert Lake is 2 mi to the northeast.
Come spring, look for brook trout tight to the bank in 2 to 15 ft. They move out to 10 to 30 ft in summer and finish the year down in 3 to 20 ft. If you only fish one area, make it Deep basin: a deep basin around 30 ft that scores prime in summer. Best bite is 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 (1 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Deep basin (30 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (1 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Break off the point (20 ft) | Small jigging spoon, Tungsten jig + plastic |
The chart marks 6 structure features on Tomasina Lake; the deepest is Deep basin at about 30 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 Tomasina Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Tomasina Lake is about 30 ft (9 m) deep at its deepest point. 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.
Anglers target brook trout on Tomasina Lake.
Deep basin is the top-rated area: a deep basin in about 30 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 Tomasina 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.
Gilbert Lake 2 mi · Wensley Lake 3 mi · Shakwa Lake 4 mi · Wenn Lake 4 mi · Lower Shakwa Lake 5 mi · Rushbrook Lake 5 mi · Gilden Lake 6 mi · Sinaminda Lake 6 mi · Kennedy Lake 6 mi · Marion L. 6 mi · Charcoal Lake 6 mi · Marguerite Lake 7 mi
See how Tomasina Lake stacks up: best brook trout lakes in Ontario
More water nearby: Sudbury District fishing maps (868 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.