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20-acre lake in Cochrane District, Ontario. The lake tops out around 40 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 1969, a decades-old survey (an MNRF lake survey). Species by species, here's what the data says the year looks like.
O'Malley Lake maps at 20 acres behind 0.9 miles of shoreline. At index 1.4 the outline is almost a bowl — read the depth changes, not the shoreline. Roughly 94% of the water is 15 ft or less, the band where the food chain lives. End to end it runs roughly 0.4 mi, about 0.2 mi across. It sits in Cochrane District. Crickard Lake sits 1 mi west — the closest neighbouring chart.
The spring pattern is a shallow one: yellow perch in 3 to 12 ft. Midsummer fish sit out in 10 to 30 ft before dropping to 15 to 35 ft for winter. The spot to know is Deep basin, a deep basin in about 27 ft of water that rates prime for yellow perch in fall. Plan around early morning in the warm months. Summer baits: a drop-shot micro plastics or a small spoon tipped with worm gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Shallow bay flat (1 ft) | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 10 to 30 ft | dawn | Deep basin (27 ft) | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 12 to 35 ft | midday | Deep basin (27 ft) | Jigging spoon (small), Perch rig / spreader |
| Winter | 15 to 35 ft | midday & dawn | Deep basin (27 ft) | Tungsten jig + spikes, Rattle spoon (small) |
Count 4 structure marks on this chart. The deepest, Deep basin, sits near 27 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 O'Malley Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
O'Malley Lake is about 40 ft (12 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1969, a decades-old survey (an MNRF lake survey).
Anglers target yellow perch on O'Malley Lake.
Deep basin is the top-rated area: a deep basin in about 27 ft of water that rates prime for yellow perch in fall. The map above holds the full rated-spot list for every species and season.
For yellow perch, the summer bite is best in early morning. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on O'Malley 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.
Crickard Lake 1 mi · Else L. 1 mi · Bradette Lake 1 mi · Dunn Lake 1 mi · Peterson Lake 1 mi · Palangio Lake 2 mi · Tailleurs L. 3 mi · Beth Lake 3 mi · Carman Lake 4 mi · Lac Rancourt 4 mi · Sommerville Lake 4 mi · L. 12F-6 4 mi
See how O'Malley Lake stacks up: best yellow perch lakes in Ontario
More water nearby: Cochrane District fishing maps (673 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.