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14-acre lake in Cochrane District, Ontario. The lake tops out around 12 ft. Bathymetry on this water is estimated from its real outline and maximum depth. Use it to shortlist water, then verify with your electronics — and never navigate by it. What follows comes from the same scoring engine that paints the spots above.
Grenier Lake maps at 14 acres behind 0.7 miles of shoreline. A shoreline index of 1.3 says round and simple: fish relate to depth changes here, not shoreline features. The whole water is littoral — nothing here runs deeper than ~15 ft, so it's all weed-and-bait territory. End to end it runs roughly 0.3 mi. It sits in Cochrane District. De Courcey Lake sits 1 mi north — the closest neighbouring chart.
Come spring, look for brook trout tight to the bank in 2 to 12 ft. Through summer count on 4 to 12 ft; the winter hold is 2 to 12 ft. Start at Deep basin. It's a deep basin holding about 10 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.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 12 ft | dawn & dusk | Shallow bay flat (3 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 4 to 12 ft | dawn & dusk | Deep basin (10 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 12 ft | midday & dawn | open water | Small spoon (orange), Spinner |
| Winter | 2 to 12 ft | dawn | Deep basin (10 ft) | Small jigging spoon, Tungsten jig + plastic |
Structure-wise the chart holds 4 features, led in depth by Deep basin at roughly 10 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 Grenier Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Grenier Lake is about 12 ft (4 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 Grenier Lake.
Deep basin is the top-rated area: a deep basin in about 10 ft of water that rates prime for brook trout in summer. Open the map above to see every rated spot for each 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 Grenier 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.
De Courcey Lake 1 mi · Andrew Lake 2 mi · Turkey Lake 2 mi · Cherry Lake 3 mi · Froude Lake 4 mi · McMillan Lake 5 mi · Talbock Lake 8 mi · Jean Lake 9 mi · Victor Lake 9 mi · Extension Lake 9 mi · Butler Lake 10 mi · Potvin Lake 10 mi
See how Grenier Lake stacks up: best brook trout lakes in Ontario
More water nearby: Cochrane District fishing maps (673 charts). Browse all Ontario fishing maps or 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.