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Rating depth structure for brook trout.
Recent public catches load as you reach this section.
70-acre lake in Thunder Bay District, Ontario. The lake tops out around 10 ft. Contours on this water are modeled from its actual shoreline and max depth. Good for finding likely water, never for navigation. Here is how the season plays out for each species, straight from the data behind the map.
The outline encloses 70 acres, worked by 2.4 miles of shoreline. With a 2.1 development index there's bank structure worth casting at, in moderation. Every acre of it sits shallower than ~15 ft: one big littoral zone, cover and forage throughout. Call it 0.7 mi long by 0.4 mi wide at the broadest reach. Thunder Bay District claims this one. If the bite dies, Bisect Lake is 1 mi to the southeast.
Spring brook trout on Question Mark Lake hold shallow, usually 1 to 10 ft. Depth-wise the year is flat: 3 to 10 ft in summer, 2 to 10 ft once it turns cold. Put Deep basin first on the milk run — a deep basin near 9 ft that grades prime for summer. The feeding windows run early morning and the evening. The summer box starts with a small spoon fished deep or a trolled lake-clear wobbler + worm.
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 | 1 to 10 ft chart-limited; documented 2 to 15 ft | dawn & dusk | Main-lake point (8 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 3 to 10 ft chart-limited; documented 10 to 30 ft | dawn & dusk | Deep basin (9 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 1 to 10 ft chart-limited; documented 2 to 15 ft | midday & dawn | Main-lake point (8 ft) | Small spoon (orange), Spinner |
| Winter | 2 to 10 ft chart-limited; documented 3 to 20 ft | dawn | Deep basin (9 ft) | Small jigging spoon, Tungsten jig + plastic |
The chart marks 6 structure features on Question Mark Lake; the deepest is Deep basin at about 9 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 Question Mark Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Question Mark Lake is about 10 ft (3 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 Question Mark Lake.
Deep basin is the top-rated area: a deep basin in about 9 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 Question Mark 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.
Bisect Lake 1 mi · Moose Lake 1 mi · Tartan Lake 1 mi · Mackenzie Lake 2 mi · Wideman Lake 2 mi · Upper Hunters Lake 2 mi · Elbow Lake 3 mi · Clegge Lake 3 mi · Lost Lake 3 mi · Hunters Lakes 3 mi · Long Lake 3 mi · Nalla Lake 3 mi
See how Question Mark 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.