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28-acre lake in Cochrane District, Ontario. The lake tops out around 48 ft. What you see is a modeled chart: the shoreline is real, the max depth is published, and the contours between are estimated. Plan with it; don't navigate by it. Every species below gets its seasonal read from the same numbers driving the chart.
Drawn out, this is 28 acres of water rimmed by 1 miles of bank. Its 1.4 shoreline index means few bank features; the contours below do the pattern work. Roughly 30% of the water is 15 ft or less as modeled, the band where the food chain lives. Tip to tip the water measures near 0.3 mi with a 0.2-mi widest point. The water lies in Cochrane District. Closest neighbour on DepthScout: Carlyle Lake, 5 mi north of here.
Spring puts brook trout in skinny water — 2 to 15 ft is the zone. Warm water sends them out to 10 to 30 ft; cold water stacks them in 3 to 20 ft. Break off the point is the standout, a drop-off at roughly 22 ft, rated prime for summer brook trout. Plan around early morning and the evening in the warm months. A small spoon fished deep or a trolled lake-clear wobbler + worm covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Main-lake point (12 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Break off the point (22 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (12 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Break off the point (22 ft) | Small jigging spoon, Tungsten jig + plastic |
3 pieces of structure are mapped here — Deep basin, around 41 ft, is the deepest of them.
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 Harker Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Harker Lake is about 48 ft (15 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 Harker Lake.
Break off the point is the top-rated area: a drop-off in about 22 ft of water that rates prime for brook trout in summer. The map above holds the full rated-spot list for every 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 Harker 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.
Carlyle Lake 5 mi · Thackeray Lake 7 mi · Driscoll Lake 8 mi · Armitage Lake 8 mi · Webster Lake 8 mi · Collins Lake 8 mi · Giunta Lake 8 mi · Trollope Lake 9 mi · Pack Can Lake 9 mi · Vinkle Lake 9 mi · Brinnie Lake 9 mi · Pothole L.s 9 mi
See how Harker 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.