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3,366-acre lake in Thunder Bay District, Ontario. The lake tops out around 53 ft. The depth data here comes from the Ontario MNRF survey of 1978, a decades-old survey (a transect sounding survey). The rest of this page walks each species through its year, using the map's own scoring.
Drawn out, this is 3,381 acres of water rimmed by 32.8 miles of bank, with 18 islands in the mix. An index of 4 puts the bank firmly in maze territory: point after pocket after cove, every one a casting target. Roughly 67% of the water is 15 ft or less, the band where the food chain lives. End to end it runs roughly 4.4 mi, about 3.5 mi across. The water lies in Thunder Bay District. For a second option, Eabamet Lake lies 7 mi northeast.
Spring lake whitefish on Triangular Lake hold shallow, usually 15 to 45 ft. By summer they slide out to 16 to 53 ft, and by winter most fish are in 16 to 53 ft. The chart's best answer is Deep basin — deep basin, 51 ft, prime for summer. Prime time lands in early morning. The summer box starts with a blade bait vertical or a small jigging spoon.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 15 to 45 ft | midday & dawn | Break off the point (26 ft) | Small jig + waxworm, Blade bait (small) |
| Summer | 16 to 53 ft | dawn | Deep basin (51 ft) | Blade bait vertical, Small jigging spoon |
| Fall | 8 to 30 ft | dusk | Break off the point (26 ft) | Small spoon (gold), Jig + plastic larva |
| Winter | 16 to 53 ft | midday & dawn | Deep basin (51 ft) | Jigging spoon + bead chain, Tungsten jig + waxie |
When the water first warms, walleye slide up into 4 to 15 ft. Summer is a 15 to 35 ft game here, winter a 20 to 40 ft one. Start at Break off the point. It's a drop-off holding about 26 ft of water and rates prime come fall. The feeding windows run the evening and early morning. Keep a crawler harness on bottom bouncer or a deep crankbait (trolled) rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 4 to 15 ft | dusk & dawn | Main-lake point (14 ft) | 1/8 oz jig + minnow, Hair jig |
| Summer | 15 to 35 ft | dusk & dawn | Break off the point (26 ft) | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 12 to 40 ft | dusk & night | Break off the point (26 ft) | Jigging rap, Jig + big minnow |
| Winter | 20 to 40 ft | dusk & dawn | Break off the point (26 ft) | Jigging spoon + minnow head, Rattle bait |
Early season sauger use the shallows, holding in 4 to 18 ft. Summer is a 10 to 30 ft game here, winter a 15 to 45 ft one. The chart's best answer is Break off the point — drop-off, 26 ft, prime for fall. Best bite is early morning and the evening. Tie on a bottom bouncer + crawler or a 3-way rig with stickbait and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 4 to 18 ft | dawn & dusk | Rock reef (2 ft) | 3/8 oz jig + ringworm, Hair jig + minnow |
| Summer | 10 to 30 ft | dawn & dusk | Break off the point (26 ft) | Bottom bouncer + crawler, 3-way rig with stickbait |
| Fall | 12 to 35 ft | dusk & dawn | Break off the point (26 ft) | Jig + big minnow, Blade bait |
| Winter | 15 to 45 ft | dusk | Break off the point (26 ft) | Heavy jigging spoon, Jig + minnow (vertical) |
When the water first warms, yellow perch slide up into 3 to 12 ft. By summer they slide out to 10 to 30 ft, and by winter most fish are in 15 to 35 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 11 ft that scores prime in spring. In summer the feeding windows fall in early morning. Keep a drop-shot micro plastics or a small spoon tipped with worm rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Shallow bay flat (11 ft) | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 10 to 30 ft | dawn | Break off the point (26 ft) | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 12 to 35 ft | midday | Break off the point (26 ft) | Jigging spoon (small), Perch rig / spreader |
| Winter | 15 to 35 ft | midday & dawn | Break off the point (26 ft) | Tungsten jig + spikes, Rattle spoon (small) |
The spring pattern is a shallow one: northern pike in 2 to 8 ft. As the season builds they drop to 8 to 20 ft, wintering in 5 to 15 ft. Top water on the chart: Back-bay flat, a weed flat in the 4 ft range, prime in spring. Time it for early morning and the evening. Summer baits: a bucktail or a weedless spoon over cabbage gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Back-bay flat (4 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 8 to 20 ft | dawn & dusk | Shallow bay flat (11 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Shallow bay flat (11 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Shallow bay flat (11 ft) | Tip-ups, Large jigging spoon |
In spring, burbot run shallow here, mostly 16 to 53 ft. Summer keeps them at 16 to 53 ft, and they winter in 13 to 53 ft. Deep basin is the standout, a deep basin at roughly 51 ft, rated prime for spring burbot. Time it for after dark and midday. You won't need more than a heavy jig + cut bait most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 16 to 53 ft | night & dusk | Deep basin (51 ft) | Glow jigging spoon + cut bait, Rattle bait (dark) |
| Summer | 16 to 53 ft | night & midday | Deep basin (51 ft) | Heavy jig + cut bait |
| Fall | 16 to 53 ft | night & dusk | Deep basin (51 ft) | Glow spoon + minnow head, Blade bait (slow) |
| Winter | 13 to 53 ft | night & dusk | Deep basin (51 ft) | Glow tungsten + cut bait, Rattle spoon + minnow head |
Triangular Lake also holds lake sturgeon (15 to 40 ft in summer). Pick any of them on the map above for rated spots and bait picks.
The chart marks 11 structure features on Triangular Lake; the deepest is Deep basin at about 51 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 Triangular Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Triangular Lake is about 53 ft (16 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1978, a decades-old survey (a transect sounding survey).
Anglers target lake whitefish, walleye, sauger, yellow perch, northern pike, burbot, lake sturgeon on Triangular Lake.
Deep basin is the top-rated area: a deep basin in about 51 ft of water that rates prime for lake whitefish in summer. Scroll up to the map for the complete spot list by species and season.
For lake whitefish, 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 Triangular 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.
Eabamet Lake 7 mi · Opikeigen Lake 15 mi · Peninsular Lake 15 mi · Abazotikichuan Lake 17 mi · Bellsmith Lake 17 mi · Studd Lake 18 mi · Opichuan Lake 19 mi · Auger Lake 20 mi · Oneside Lake 20 mi · Hurst Lake 20 mi · Gifford Lake 21 mi · Elbow L. 22 mi
See how Triangular Lake stacks up: best walleye lakes in Ontario · best sauger lakes in Ontario · best northern pike lakes in Ontario · best yellow perch lakes in Ontario
More water nearby: Thunder Bay District fishing maps (662 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.