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Rating depth structure for lake trout.
Shared by DepthScout anglers. Exact spots stay private, always.
198-acre lake in Sudbury District, Ontario. The lake tops out around 89 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 1980 (an MNRF lake survey). Every species below gets its seasonal read from the same numbers driving the chart.
On the chart, Iron Lake draws 199 acres inside 4 miles of shoreline. The shoreline is moderately structured (index 2) — enough points and pockets to pattern. The shallow band under 15 ft claims about 46% of the surface — that's where the groceries are. Call it 1.2 mi long by 0.7 mi wide at the broadest reach. The water lies in Sudbury District. Closest neighbour on DepthScout: Pond Lake, 2 mi east of here.
Spring puts lake trout in skinny water — 10 to 40 ft is the zone. As the season builds they drop to 27 to 89 ft, wintering in 20 to 80 ft. Summer lake trout concentrate at Deep basin, a prime-rated deep basin around 80 ft. Warm-month bites cluster around early morning. A white tube jig (deep) or a magnum spoon on downrigger covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Main-lake point (2 ft) | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 27 to 89 ft | dawn | Deep basin (80 ft) | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 10 to 50 ft | dusk & dawn | Main-lake point (2 ft) | Heavy casting spoon, Jigging rap over reefs |
| Winter | 20 to 80 ft | dawn | Deep basin (80 ft) | White tube jig, Airplane jig |
In spring, splake run shallow here, mostly 5 to 25 ft. Summer pushes them deeper, 25 to 60 ft, and winter fish settle into 10 to 45 ft. Break off the point is the standout, a drop-off at roughly 3 ft, rated prime for winter splake. Time it for early morning and the evening. You won't need more than a trolled spoon at the thermocline or a white tube jig (deep) most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 25 ft | dawn & dusk | Main-lake point (2 ft) | Small casting spoon (gold/orange), Inline spinner |
| Summer | 25 to 60 ft | dawn & dusk | Break off the point (3 ft) | Trolled spoon at the thermocline, White tube jig (deep) |
| Fall | 10 to 35 ft | dawn & dusk | Main-lake point (2 ft) | Casting spoon, Jerkbait |
| Winter | 10 to 45 ft | dawn | Break off the point (3 ft) | Jigging spoon tipped with minnow head, Small white tube |
Count 6 structure marks on this chart. The deepest, Deep basin, sits near 80 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 Iron Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Iron Lake is about 89 ft (27 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1980 (an MNRF lake survey).
Anglers target lake trout, splake on Iron Lake.
Deep basin is the top-rated area: a deep basin in about 80 ft of water that rates prime for lake trout in summer. Scroll up to the map for the complete spot list by species and season.
For lake trout, the summer bite is best in 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 Iron 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.
Pond Lake 2 mi · Emerald Lake 3 mi · Wawiagama Lake 4 mi · High Lake 4 mi · Rachel Lake 4 mi · Woods Lake 5 mi · Aleck Lake 5 mi · Eaglerock Lake 5 mi · Fry Lake 6 mi · Clearwater Lake 6 mi · Obabika Lake 7 mi · Upper Bass Lake 7 mi
See how Iron Lake stacks up: best lake trout lakes in Ontario · best splake lakes in Ontario
More water nearby: Sudbury District fishing maps (868 charts). Browse all Ontario fishing maps or 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.