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Rating depth structure for lake trout.
Shared by DepthScout anglers. Exact spots stay private, always.
578-acre lake in Sudbury District, Ontario. The lake tops out around 48 ft. These contours are modeled — built from the real shoreline and the water's maximum depth — so read them as a guide, never as navigation. What follows comes from the same scoring engine that paints the spots above.
Drawn out, this is 580 acres of water rimmed by 8.7 miles of bank, broken up by an island. An index of 2.6 puts the bank firmly in maze territory: point after pocket after cove, every one a casting target. 57% of the surface is littoral (under ~15 ft), per the model — cover, weeds and forage water. End to end it runs roughly 2.1 mi, about 1.2 mi across. You'll find it in Sudbury District. For a second option, Nushatogaini Lake lies 2 mi northeast.
Spring puts lake trout in skinny water — 10 to 40 ft is the zone. Warm water sends them out to 14 to 48 ft; cold water stacks them in 12 to 48 ft. Deep basin is the standout, a deep basin at roughly 41 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 (12 ft) | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 14 to 48 ft | dawn | Deep basin (41 ft) | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 10 to 48 ft | dusk & dawn | Main-lake point (12 ft) | Heavy casting spoon, Jigging rap over reefs |
| Winter | 12 to 48 ft | dawn | Deep basin (41 ft) | White tube jig, Airplane jig |
Early season lake whitefish use the shallows, holding in 15 to 45 ft. Summer is a 14 to 48 ft game here, winter a 14 to 48 ft one. The chart's best answer is Deep basin — deep basin, 41 ft, prime for summer. Best bite is early morning. Tie on a blade bait vertical or a small jigging spoon and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 15 to 45 ft | midday & dawn | Break off the point (22 ft) | Small jig + waxworm, Blade bait (small) |
| Summer | 14 to 48 ft | dawn | Deep basin (41 ft) | Blade bait vertical, Small jigging spoon |
| Fall | 8 to 30 ft | dusk | Break off the point (22 ft) | Small spoon (gold), Jig + plastic larva |
| Winter | 14 to 48 ft | midday & dawn | Deep basin (41 ft) | Jigging spoon + bead chain, Tungsten jig + waxie |
Early season cisco (lake herring) use the shallows, holding in 10 to 40 ft. Summer is a 14 to 48 ft game here, winter a 14 to 48 ft one. The chart's best answer is Deep basin — deep basin, 41 ft, prime for summer. Best bite is early morning. Tie on a vertical flutter spoon (small) or a drop-shot micro plastic and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Deep basin (41 ft) | Small silver spoon, Tiny swim jig (white) |
| Summer | 14 to 48 ft | dawn | Deep basin (41 ft) | Vertical flutter spoon (small), Drop-shot micro plastic |
| Fall | 5 to 25 ft | dusk & dawn | Break off the point (22 ft) | Small casting spoon, Inline spinner (silver) |
| Winter | 14 to 48 ft | dawn | Deep basin (41 ft) | Small jigging spoon (glow/silver), Tungsten jig + minnow head |
Prairie Grass Lake carries 6 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 41 ft down.
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 Prairie Grass Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Prairie Grass 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 lake trout, lake whitefish, cisco (lake herring) on Prairie Grass Lake.
Deep basin is the top-rated area: a deep basin in about 41 ft of water that rates prime for lake trout in summer. Open the map above to see every rated 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 Prairie Grass 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.
Nushatogaini Lake 2 mi · Clove Lake 3 mi · Megisan Lake 4 mi · Hail Lake 5 mi · Torrance Lake 5 mi · Becor Lake 5 mi · Flamingo Lake 6 mi · Gord Lake 6 mi · Affleck Lake 6 mi · Firetrail Lake 6 mi · Lost Lake 7 mi · Lance Lake 8 mi
See how Prairie Grass Lake stacks up: best lake trout lakes in Ontario · best lake whitefish lakes in Ontario · best cisco (lake herring) lakes in Ontario
More water nearby: Sudbury District fishing maps (868 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.