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Rating depth structure for brook trout.
Recent public catches load as you reach this section.
54-acre lake in Algoma District, Ontario. The lake tops out around 17 ft. The contours are modeled from the water's real shoreline and maximum depth. Treat them as a rough guide, and never use them for navigation. What the data behind the map says about each species, season by season:
The drawn water covers 53 acres wrapped in 1.5 miles of bank. A middling shoreline index (1.5) gives it some bays to work without being a maze. Roughly 95% of the water is 15 ft or less as modeled, the band where the food chain lives. The basin spans about 0.5 mi end to end and 0.3 mi across at its widest. It sits in Algoma District. If the bite dies, Strums Lake is 0 mi to the northeast.
Come spring, look for brook trout tight to the bank in 2 to 15 ft. Expect a summer slide to 5 to 17 ft, then a winter hold in 3 to 17 ft. Start at Deep basin. It's a deep basin holding about 14 ft of water and rates prime come summer. 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.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Main-lake point (8 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 5 to 17 ft chart-limited; documented 10 to 30 ft | dawn & dusk | Deep basin (14 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (8 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 17 ft chart-limited; documented 3 to 20 ft | dawn | Deep basin (14 ft) | Small jigging spoon, Tungsten jig + plastic |
Castleman Lake carries 5 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 14 ft down.
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 Castleman Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Castleman Lake is about 17 ft (5 m) deep at its deepest point. The contours here are modeled from the water's real shape and maximum depth, so treat them as a rough guide.
Anglers target brook trout on Castleman Lake.
Deep basin is the top-rated area: a deep basin in about 14 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 Castleman 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.
Strums Lake 0 mi · Fern Lake 3 mi · Paquette Lake 4 mi · Boat Lake 5 mi · Garden Lake 6 mi · Vixen Lake 6 mi · Whitman Lake 6 mi · Deer Lake 6 mi · Metivier Lake 7 mi · Leishman Lake 7 mi · Roussain Lake 8 mi · Devil's Lake 8 mi
See how Castleman 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. 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.