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Rating depth structure for lake trout.
Shared by DepthScout anglers. Exact spots stay private, always.
80-acre lake in Nipissing District, Ontario. The lake tops out around 50 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 1968, a decades-old survey (an MNRF lake survey). What follows comes from the same scoring engine that paints the spots above.
The drawn water covers 82 acres wrapped in 3 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. The shallow band under 15 ft claims about 74% of the surface — that's where the groceries are. Call it 1 mi long by 0.4 mi wide at the broadest reach. Nipissing District claims this one. David Lake sits 2 mi west — the closest neighbouring chart.
Spring lake trout on South Iron Lake hold shallow, usually 10 to 40 ft. They move out to 15 to 50 ft in summer and finish the year down in 13 to 50 ft. Put Deep basin first on the milk run — a deep basin near 50 ft that grades prime for summer. The feeding windows run early morning. The summer box starts with a white tube jig (deep) or a magnum spoon on downrigger.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Break off the point (20 ft) | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 15 to 50 ft | dawn | Deep basin (50 ft) | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 10 to 50 ft | dusk & dawn | Break off the point (20 ft) | Heavy casting spoon, Jigging rap over reefs |
| Winter | 13 to 50 ft | dawn | Deep basin (50 ft) | White tube jig, Airplane jig |
In spring, pumpkinseed run shallow here, mostly 1 to 8 ft. Midsummer fish sit out in 2 to 10 ft before dropping to 6 to 18 ft for winter. Spring pumpkinseed concentrate at Shallow bay flat, a prime-rated weed flat around 1 ft. Fish it in the evening and early morning and you'll meet the bite. You won't need more than a micro tube or a sponge spider (fly) most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 8 ft | midday & dusk | Shallow bay flat (1 ft) | Micro jig under a float, Tiny beetle-spin |
| Summer | 2 to 10 ft | dusk & dawn | Shallow bay flat (1 ft) | Micro tube, Sponge spider (fly) |
| Fall | 4 to 14 ft | dusk & dawn | Shallow bay flat (1 ft) | Micro jig + waxworm, Small spoon tipped |
| Winter | 6 to 18 ft | dawn | Shallow bay flat (1 ft) | Tungsten ice jig + plastic, Tiny spoon |
Count 6 structure marks on this chart. The deepest, Deep basin, sits near 50 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 South Iron Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
South Iron Lake is about 50 ft (15 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1968, a decades-old survey (an MNRF lake survey).
Anglers target lake trout, pumpkinseed on South Iron Lake.
Deep basin is the top-rated area: a deep basin in about 50 ft of water that rates prime for lake trout in summer. Open the map above to see every rated spot for each 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 South 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.
David Lake 2 mi · Sinton Lake 3 mi · Aileen Lake 4 mi · Lac à Brochets 4 mi · Pats Lake 4 mi · Surveyor Lake 4 mi · Marymac Lake 5 mi · Cross Lake 5 mi · Smith Lake 5 mi · East Jones Lake 5 mi · Clem Lake 5 mi · Indian Trail Lake 7 mi
See how South Iron Lake stacks up: best lake trout lakes in Ontario · best pumpkinseed lakes in Ontario
More water nearby: Nipissing District fishing maps (683 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.