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Rating depth structure for brook trout.
Recent public catches load as you reach this section.
65-acre lake in Thunder Bay District, Ontario. The lake tops out around 29 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. Here's the year, species by species, as the scoring engine sees it.
The drawn water covers 65 acres wrapped in 2.1 miles of bank. A middling shoreline index (1.9) gives it some bays to work without being a maze. Roughly 69% of the water is 15 ft or less as modeled, the band where the food chain lives. Figure 0.9 mi of water from one end to the other, 0.2 mi at the beam. Thunder Bay District claims this one. Pass Lake sits 1 mi south — the closest neighbouring chart.
When the water first warms, brook trout slide up into 2 to 15 ft. Summer is a 9 to 29 ft game here, winter a 3 to 20 ft one. Start at Deep basin. It's a deep basin holding about 25 ft of water and rates prime come summer. The feeding windows run early morning and the evening. Keep a small spoon fished deep or a trolled lake-clear wobbler + worm rigged through the warm months.
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 15 ft | dawn & dusk | Main-lake point (8 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 9 to 29 ft chart-limited; documented 10 to 30 ft | dawn & dusk | Deep basin (25 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (8 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Break off the point (13 ft) | Small jigging spoon, Tungsten jig + plastic |
6 pieces of structure are mapped here — Deep basin, around 25 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 Upper Pass Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Upper Pass Lake is about 29 ft (9 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 brook trout on Upper Pass Lake.
Deep basin is the top-rated area: a deep basin in about 25 ft of water that rates prime for brook trout in summer. Scroll up to the map for the complete spot list by 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 Upper Pass 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.
Pass Lake 1 mi · Mirror Lake 4 mi · Deception Lake 4 mi · D'Arcy Lake 4 mi · Silver Lake 4 mi · Milkshake Lake 5 mi · Loon Lake 5 mi · Pounsford Lake 6 mi · Lizard Lake 6 mi · Hunters Lakes 7 mi · Nalla Lake 7 mi · Sward Lake 7 mi
See how Upper Pass Lake stacks up: best brook trout lakes in Ontario
More water nearby: Thunder Bay District fishing maps (662 charts). Browse all Ontario fishing maps. 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.