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813-acre lake in Thunder Bay District, Ontario. The lake tops out around 17 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 1974, a decades-old survey (an MNRF lake survey). What the data behind the map says about each species, season by season:
Drawn out, this is 825 acres of water rimmed by 18.3 miles of bank, with 5 islands in the mix. The 4.5 development index tells the story — a convoluted bank whose fishable edge far outruns the acreage. Call it 3.2 mi long by 2.1 mi wide at the broadest reach. You'll find it in Thunder Bay District. For a second option, Samuelson Lake lies 2 mi southeast.
Come spring, look for walleye tight to the bank in 4 to 15 ft. Expect a summer slide to 5 to 17 ft, then a winter hold in 5 to 17 ft. Start at Deep basin. It's a deep basin holding about 9 ft of water and rates prime come winter. Prime time lands in the evening and early morning. A crawler harness on bottom bouncer or a deep crankbait (trolled) is the honest summer answer here.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 4 to 15 ft | dusk & dawn | Main-lake point (1 ft) | 1/8 oz jig + minnow, Hair jig |
| Summer | 5 to 17 ft chart-limited; documented 15 to 35 ft | dusk & dawn | Deep basin (9 ft) | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 5 to 17 ft chart-limited; documented 12 to 40 ft | dusk & night | Deep basin (9 ft) | Jigging rap, Jig + big minnow |
| Winter | 5 to 17 ft chart-limited; documented 20 to 40 ft | dusk & dawn | Deep basin (9 ft) | Jigging spoon + minnow head, Rattle bait |
Come spring, look for yellow perch tight to the bank in 3 to 12 ft. They move out to 5 to 17 ft in summer and finish the year down in 5 to 17 ft. If you only fish one area, make it Deep basin: a deep basin around 9 ft that scores prime in fall. Best bite is early morning. A drop-shot micro plastics or a small spoon tipped with worm is the honest summer answer here.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Shallow bay flat (1 ft) | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 5 to 17 ft chart-limited; documented 10 to 30 ft | dawn | Deep basin (9 ft) | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 5 to 17 ft chart-limited; documented 12 to 35 ft | midday | Deep basin (9 ft) | Jigging spoon (small), Perch rig / spreader |
| Winter | 5 to 17 ft chart-limited; documented 15 to 35 ft | midday & dawn | Deep basin (9 ft) | Tungsten jig + spikes, Rattle spoon (small) |
Start shallow in spring: northern pike sit in 2 to 8 ft that time of year. Warm water sends them out to 5 to 17 ft; cold water stacks them in 5 to 15 ft. Top water on the chart: Shallow bay flat, a weed flat in the 1 ft range, prime in spring. Fish it in early morning and the evening and you'll meet the bite. Throw a bucktail or a weedless spoon over cabbage until the fish tell you otherwise.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (1 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 5 to 17 ft chart-limited; documented 8 to 20 ft | dawn & dusk | Shallow bay flat (1 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 5 to 17 ft chart-limited; documented 6 to 18 ft | midday & dawn | Deep basin (9 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Shallow bay flat (1 ft) | Tip-ups, Large jigging spoon |
6 pieces of structure are mapped here — Deep basin, around 9 ft, is the deepest of them.
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 Trident Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Trident Lake is about 17 ft (5 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1974, a decades-old survey (an MNRF lake survey).
Anglers target walleye, yellow perch, northern pike on Trident Lake.
Deep basin is the top-rated area: a deep basin in about 9 ft of water that rates prime for walleye in winter. Every other rated spot, per species and season, is on the map above.
For walleye, the summer bite is best in the evening and 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 Trident 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.
Samuelson Lake 2 mi · Storm Lake 6 mi · Hoff Lake 9 mi · Alph Lake 9 mi · Cammack Lake 10 mi · Runway Lake 11 mi · Betty Lake 11 mi · E206 L. 12 mi · Esnagami Lake 13 mi · Haskett Lake 13 mi · Wababimiga Lake 14 mi · McEachern Lake 14 mi
See how Trident Lake stacks up: best walleye 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. 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.