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Rating depth structure for lake trout.
Shared by DepthScout anglers. Exact spots stay private, always.
45-acre lake in Algoma District, Ontario. The lake tops out around 36 ft. Bathymetry on this water is estimated from its real outline and maximum depth. Use it to shortlist water, then verify with your electronics — and never navigate by it. What the data behind the map says about each species, season by season:
The drawn water covers 45 acres wrapped in 1.8 miles of bank. A middling shoreline index (2) gives it some bays to work without being a maze. 46% of the surface is littoral (under ~15 ft), per the model — cover, weeds and forage water. The basin spans about 0.5 mi end to end and 0.4 mi across at its widest. It sits in Algoma District. Its nearest charted neighbour, Mystery Lake, is 1 mi to the east.
Spring lake trout on Upper Twin L. hold shallow, usually 9 to 36 ft. Depth-wise the year is flat: 11 to 36 ft in summer, 9 to 36 ft once it turns cold. The chart's best answer is Deep basin — deep basin, 31 ft, prime for summer. Prime time lands in early morning. The summer box starts with a white tube jig (deep) or a magnum spoon on downrigger.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 9 to 36 ft | dawn & dusk | Main-lake point (9 ft) | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 11 to 36 ft | dawn | Deep basin (31 ft) | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 7 to 36 ft | dusk & dawn | Main-lake point (9 ft) | Heavy casting spoon, Jigging rap over reefs |
| Winter | 9 to 36 ft | dawn | Deep basin (31 ft) | White tube jig, Airplane jig |
In spring, lake whitefish run shallow here, mostly 11 to 36 ft. Summer keeps them at 11 to 36 ft, and they winter in 11 to 36 ft. Deep basin is the standout, a deep basin at roughly 31 ft, rated prime for summer lake whitefish. Time it for early morning. You won't need more than a blade bait vertical or a small jigging spoon most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 11 to 36 ft | midday & dawn | Break off the point (16 ft) | Small jig + waxworm, Blade bait (small) |
| Summer | 11 to 36 ft | dawn | Deep basin (31 ft) | Blade bait vertical, Small jigging spoon |
| Fall | 8 to 30 ft | dusk | Break off the point (16 ft) | Small spoon (gold), Jig + plastic larva |
| Winter | 11 to 36 ft | midday & dawn | Deep basin (31 ft) | Jigging spoon + bead chain, Tungsten jig + waxie |
Count 5 structure marks on this chart. The deepest, Deep basin, sits near 31 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 Upper Twin L. specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Upper Twin L. is about 36 ft (11 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 on Upper Twin L..
Deep basin is the top-rated area: a deep basin in about 31 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 Upper Twin L. 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.
Mystery Lake 1 mi · Island Lake 1 mi · Gavor Lake 2 mi · Friendly Lake 2 mi · Anvil Lake 2 mi · McIlveen L. 19 4 mi · Lodestone Lake 4 mi · McIlveen L. 20 5 mi · Welcome Lake 5 mi · Saymo Lake 5 mi · Gravel Lake 5 mi · Amy Lake 5 mi
See how Upper Twin L. stacks up: best lake trout lakes in Ontario · best lake whitefish lakes in Ontario
More water nearby: Algoma District fishing maps (1026 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.