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Rating depth structure for lake trout.
Shared by DepthScout anglers. Exact spots stay private, always.
125-acre lake in Timiskaming District, Ontario. The lake tops out around 72 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 1977, a decades-old survey (an MNRF lake survey). Here's the year, species by species, as the scoring engine sees it.
Traced from the shoreline, Diabase Lake runs 126 acres with 3 miles of edge. The shoreline is moderately structured (index 1.9) — enough points and pockets to pattern. The shallow band under 15 ft claims about 71% of the surface — that's where the groceries are. Figure 1 mi of water from one end to the other, 0.4 mi at the beam. You'll find it in Timiskaming District. For a second option, Whitewater Lake lies 1 mi southeast.
Spring puts lake trout in skinny water — 10 to 40 ft is the zone. Warm water sends them out to 22 to 72 ft; cold water stacks them in 18 to 72 ft. Deep basin is the standout, a deep basin at roughly 66 ft, rated prime for summer lake trout. Plan around early morning in the warm months. A white tube jig (deep) or a magnum spoon on downrigger covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Main-lake point (1 ft) | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 22 to 72 ft | dawn | Deep basin (66 ft) | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 10 to 50 ft | dusk & dawn | Break off the point (49 ft) | Heavy casting spoon, Jigging rap over reefs |
| Winter | 18 to 72 ft | dawn | Deep basin (66 ft) | White tube jig, Airplane jig |
Early season rock bass use the shallows, holding in 2 to 10 ft. Summer is a 5 to 20 ft game here, winter a 12 to 30 ft one. The chart's best answer is Main-lake point — point, 1 ft, prime for summer. Best bite is the evening. Tie on a ned rig (small) or a marabou jig and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | midday & dawn | Main-lake point (1 ft) | 1/16 oz jig + grub, Small inline spinner |
| Summer | 5 to 20 ft | dusk | Main-lake point (1 ft) | Ned rig (small), Marabou jig |
| Fall | 8 to 22 ft | midday | Break off the point (49 ft) | Small tube jig, Inline spinner |
| Winter | 12 to 30 ft | midday | Deep basin (66 ft) | Tungsten jig + plastic, Small spoon + spike |
The chart marks 6 structure features on Diabase Lake; the deepest is Deep basin at about 66 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 Diabase Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Diabase Lake is about 72 ft (22 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1977, a decades-old survey (an MNRF lake survey).
Anglers target lake trout, rock bass on Diabase Lake.
Deep basin is the top-rated area: a deep basin in about 66 ft of water that rates prime for lake trout in summer. The map above holds the full rated-spot list for every 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 Diabase 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.
Whitewater Lake 1 mi · Little Eagle Lake 2 mi · Shallow Lake 3 mi · Eagle Lake 3 mi · Anima Nipissing Lake 4 mi · Turner Lake 4 mi · McLean Lake 4 mi · Mannajigama Lake 5 mi · Aston Lake 5 mi · Liberty Lake 5 mi · Gullrock Lake 5 mi · Barter Lake 5 mi
See how Diabase Lake stacks up: best lake trout lakes in Ontario · best rock bass lakes in Ontario
More water nearby: Timiskaming District fishing maps (515 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.