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Rating depth structure for lake trout.
Shared by DepthScout anglers. Exact spots stay private, always.
184-acre lake in Nipissing District, Ontario. The lake tops out around 81 ft. Depth here is modeled from the true shoreline and max depth rather than surveyed; use it to plan, not to navigate. What follows comes from the same scoring engine that paints the spots above.
The outline encloses 183 acres, worked by 5 miles of shoreline, broken up by an island. With a shoreline index of 2.6, this water is all arms and coves — edge habitat well beyond its acreage. Roughly 34% of the water is 15 ft or less as modeled, the band where the food chain lives. The basin spans about 1.4 mi end to end and 0.6 mi across at its widest. Nipissing District claims this one. Lawrence Lake sits 1 mi south — the closest neighbouring chart.
When the water first warms, lake trout slide up into 10 to 40 ft. Summer is a 24 to 81 ft game here, winter a 20 to 80 ft one. Start at Deep basin. It's a deep basin holding about 69 ft of water and rates prime come summer. The feeding windows run early morning. Keep a white tube jig (deep) or a magnum spoon on downrigger rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Main-lake point (20 ft) | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 24 to 81 ft | dawn | Deep basin (69 ft) | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 10 to 50 ft | dusk & dawn | Main-lake point (20 ft) | Heavy casting spoon, Jigging rap over reefs |
| Winter | 20 to 80 ft | dawn | Deep basin (69 ft) | White tube jig, Airplane jig |
Count 6 structure marks on this chart. The deepest, Deep basin, sits near 69 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 Harness Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Harness Lake is about 81 ft (25 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 lake trout on Harness Lake.
Deep basin is the top-rated area: a deep basin in about 69 ft of water that rates prime for lake trout in summer. The interactive chart above rates every spot for each species and season.
For lake trout, 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 Harness 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.
Lawrence Lake 1 mi · Kenneth Lake 1 mi · Head Lake 1 mi · Rod and Gun Lake 2 mi · Phipps Lake 3 mi · Lake Louisa 3 mi · Delano Lake 3 mi · Cache Lake 3 mi · Grant Lake 3 mi · Cradle Lake 4 mi · Hilliard Lake 4 mi · Provoking Lake 4 mi
See how Harness Lake stacks up: best lake trout lakes in Ontario
More water nearby: Nipissing District fishing maps (683 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.