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71-acre lake in Thunder Bay District, Ontario. The lake tops out around 39 ft. The depth data here comes from the Ontario MNRF survey of 1989 (a transect sounding survey). What the data behind the map says about each species, season by season:
The drawn water covers 72 acres wrapped in 2.8 miles of bank. A development index of 2.4 means a maze of bays and points: far more casting targets than a round bowl of the same size. About 35% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. Call it 1 mi long by 0.3 mi wide at the broadest reach. Thunder Bay District claims this one. Its nearest charted neighbour, Stephens Lake, is 2 mi to the southwest.
Spring brook trout on Thunder Lake hold shallow, usually 2 to 15 ft. They move out to 10 to 30 ft in summer and finish the year down in 3 to 20 ft. Put Secondary point first on the milk run — a point near 15 ft that grades prime for spring. 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.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Secondary point (15 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Break off the point (8 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Secondary point (15 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Break off the point (8 ft) | Small jigging spoon, Tungsten jig + plastic |
Thunder Lake carries 6 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 39 ft down.
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 Thunder Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Thunder Lake is about 39 ft (12 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1989 (a transect sounding survey).
Anglers target brook trout on Thunder Lake.
Secondary point is the top-rated area: a point in about 15 ft of water that rates prime for brook trout in spring. The interactive chart above rates every 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 Thunder 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.
Stephens Lake 2 mi · Adrian Lake 4 mi · Marks Lake 7 mi · Pete Lake 10 mi · West Pennock 12 mi · Little Dog Lake 13 mi · Echo Lake 13 mi · Blossom Lake 15 mi · Chub Lake 17 mi · Oliver Lake 18 mi · Hawkeye Lake 19 mi · Batwing Lake 19 mi
See how Thunder Lake stacks up: best brook trout 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.