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Rating depth structure for brook trout.
Recent public catches load as you reach this section.
9-acre lake in Thunder Bay District, Ontario. The lake tops out around 25 ft. The contours come from a model of the real basin shape and its known max depth. Read them as probabilities, not soundings, and keep them out of navigation decisions. The season-by-season read for each species follows, from the map's own numbers.
Traced from the shoreline, Deer Lake runs 9 acres with 0.5 miles of edge. A shoreline index of 1.2 says round and simple: fish relate to depth changes here, not shoreline features. 56% of the surface is littoral (under ~15 ft), per the model — cover, weeds and forage water. You'll find it in Thunder Bay District. The nearest mapped water is Purdom Lake, 7 mi to the northwest.
In spring, brook trout run shallow here, mostly 2 to 15 ft. Summer pushes them deeper, 8 to 25 ft, and winter fish settle into 3 to 20 ft. Deep basin is the standout, a deep basin at roughly 21 ft, rated prime for summer brook trout. Time it for early morning and the evening. You won't need more than a small spoon fished deep or a trolled lake-clear wobbler + worm most summer days.
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 | Shallow bay flat (3 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 8 to 25 ft chart-limited; documented 10 to 30 ft | dawn & dusk | Deep basin (21 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | open water | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Shoreline break (11 ft) | Small jigging spoon, Tungsten jig + plastic |
Structure-wise the chart holds 4 features, led in depth by Deep basin at roughly 21 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 Deer Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Deer Lake is about 25 ft (8 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 Deer Lake.
Deep basin is the top-rated area: a deep basin in about 21 ft of water that rates prime for brook trout in summer. Open the map above to see every rated 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 Deer 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.
Purdom Lake 7 mi · Fire Hill Lake 10 mi · Driftstone Lake 10 mi · Mound Lake 13 mi · Stewart Lake 14 mi · Eskwanonwatin Lake 15 mi · Cox Lake 15 mi · Frazer Lake 16 mi · Wolfpup Lake 16 mi · McKirdy Lake 17 mi · Shamrock Lake 17 mi · Black Mountain Lake 17 mi
See how Deer 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.