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345-acre lake in Algoma District, Ontario. The lake tops out around 69 ft. The depth data here comes from the Ontario MNRF survey of 2024 (an MNRF lake survey). Every species below gets its seasonal read from the same numbers driving the chart.
Robertson Lake maps at 347 acres behind 4.6 miles of shoreline. With a 1.8 development index there's bank structure worth casting at, in moderation. The shallow band under 15 ft claims about 8% of the surface — that's where the groceries are. Figure 1.9 mi of water from one end to the other, 0.5 mi at the beam. Algoma District claims this one. If the bite dies, Sill Lake is 1 mi to the southeast.
Early season brook trout use the shallows, holding in 2 to 15 ft. Summer is a 10 to 30 ft game here, winter a 3 to 20 ft one. The chart's best answer is Shallow bay flat — feeding flat, 7 ft, good for spring. Best bite is early morning and the evening. Tie on a small spoon fished deep or a trolled lake-clear wobbler + worm and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Shallow bay flat (7 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | open water | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Secondary point (19 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Shallow bay flat (7 ft) | Small jigging spoon, Tungsten jig + plastic |
When the water first warms, lake trout slide up into 10 to 40 ft. Summer is a 21 to 69 ft game here, winter a 17 to 69 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 (34 ft) | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 21 to 69 ft | dawn | Deep basin (69 ft) | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 10 to 50 ft | dusk & dawn | Main-lake point (34 ft) | Heavy casting spoon, Jigging rap over reefs |
| Winter | 17 to 69 ft | dawn | Deep basin (69 ft) | White tube jig, Airplane jig |
Spring rainbow trout on Robertson Lake hold shallow, usually 5 to 20 ft. They move out to 8 to 30 ft in summer and finish the year down in 8 to 40 ft. Put Secondary point first on the milk run — a point near 19 ft that grades prime for spring. The feeding windows run early morning and the evening. The summer box starts with a dodger + spoon (deep troll) or a flutter spoon.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Secondary point (19 ft) | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Secondary point (19 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Main-lake point (34 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | Break off the point (68 ft) | Jigging spoon, Tube jig (white) |
Start shallow in spring: cisco (lake herring) sit in 10 to 40 ft that time of year. Warm water sends them out to 21 to 69 ft; cold water stacks them in 20 to 60 ft. Top water on the chart: Deep basin, a deep basin in the 69 ft range, prime in summer. Fish it in early morning and you'll meet the bite. Throw a vertical flutter spoon (small) or a drop-shot micro plastic until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Deep basin (69 ft) | Small silver spoon, Tiny swim jig (white) |
| Summer | 21 to 69 ft | dawn | Deep basin (69 ft) | Vertical flutter spoon (small), Drop-shot micro plastic |
| Fall | 5 to 25 ft | dusk & dawn | open water | Small casting spoon, Inline spinner (silver) |
| Winter | 20 to 60 ft | dawn | Deep basin (69 ft) | Small jigging spoon (glow/silver), Tungsten jig + minnow head |
Structure-wise the chart holds 6 features, led in depth by Deep basin at roughly 69 ft.
Access data: Land Information Ontario — Fishing Access Point. Confirm conditions and fees locally before you launch.
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 Robertson Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Robertson Lake is about 69 ft (21 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 2024 (an MNRF lake survey).
Anglers target brook trout, lake trout, rainbow trout, cisco (lake herring) on Robertson 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. Open the map above to see every rated spot for each 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 Robertson 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.
Sill Lake 1 mi · Mystery Lake 1 mi · Bone Lake 2 mi · Bojack Lake 3 mi · Pickard Lake 3 mi · Tupper Lake 4 mi · Walker Lake 4 mi · Evans Lake 4 mi · Weckstrom Lake 6 mi · Wolfe Lake 7 mi · Twab Lake 7 mi · Leonard Lake 7 mi
See how Robertson Lake stacks up: best rainbow trout lakes in Ontario · best lake trout lakes in Ontario · best brook trout lakes in Ontario · best cisco (lake herring) lakes in Ontario
More water nearby: Algoma District fishing maps (1026 charts). Browse all Ontario fishing maps or see every water on DepthScout. Bathymetry credit: state fisheries survey programs. 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.