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Rating depth structure for brook trout.
Recent public catches load as you reach this section.
28-acre lake in Cochrane District, Ontario. The lake tops out around 27 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 1974, a decades-old survey (an MNRF lake survey). Here is how the season plays out for each species, straight from the data behind the map.
The drawn water covers 28 acres wrapped in 1.1 miles of bank. With a 1.5 development index there's bank structure worth casting at, in moderation. Roughly 94% of the water is 15 ft or less, the band where the food chain lives. Tip to tip the water measures near 0.4 mi. It sits in Cochrane District. If the bite dies, Fortune Lake is 8 mi to the west.
Early season brook trout use the shallows, holding in 2 to 15 ft. Expect a summer slide to 8 to 27 ft, then a winter hold in 3 to 20 ft. Put Deep basin first on the milk run — a deep basin near 24 ft that grades prime for summer. In summer the feeding windows fall in early morning and the evening. Tie on a small spoon fished deep or a trolled lake-clear wobbler + worm and you're in the game.
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 (1 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 8 to 27 ft chart-limited; documented 10 to 30 ft | dawn & dusk | Deep basin (24 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 (5 ft) | Small jigging spoon, Tungsten jig + plastic |
Blue Lake carries 5 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 24 ft down.
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 Blue Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Blue Lake is about 27 ft (8 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1974, a decades-old survey (an MNRF lake survey).
Anglers target brook trout on Blue Lake.
Deep basin is the top-rated area: a deep basin in about 24 ft of water that rates prime for brook trout in summer. Every other rated spot, per species and season, is on the map above.
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 Blue 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.
Fortune Lake 8 mi · Wallingford Lake 14 mi · Horseshoe Lake 14 mi · Lower Aitken Lake 15 mi · Cook's Lake 16 mi · Montcalm L. 6 16 mi · Aitken Lake 17 mi · Baker Lake 17 mi · Keefer Lake 18 18 mi · Bouchard Lake 18 mi · Feldman Lake 18 mi · Duck Lake 18 mi
See how Blue Lake stacks up: best brook trout lakes in Ontario
More water nearby: Cochrane District fishing maps (673 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.