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60-acre lake in Algoma District, Ontario. The lake tops out around 35 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 1967, a decades-old survey (an MNRF lake survey). Species by species, here's what the data says the year looks like.
Islay Lake maps at 60 acres behind 2 miles of shoreline. A middling shoreline index (1.9) gives it some bays to work without being a maze. The shallow band under 15 ft claims about 62% of the surface — that's where the groceries are. Call it 0.9 mi long by 0.2 mi wide at the broadest reach. It sits in Algoma District. If the bite dies, Round Lake is 1 mi to the south.
Come spring, look for brook trout tight to the bank in 2 to 15 ft. Expect a summer slide to 10 to 30 ft, then a winter hold in 3 to 20 ft. Start at Main-lake point. It's a point holding about 1 ft of water and rates prime come spring. Prime time lands in early morning and the evening. A small spoon fished deep or a trolled lake-clear wobbler + worm is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Main-lake point (1 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Deep basin (35 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (1 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Break off the point (1 ft) | Small jigging spoon, Tungsten jig + plastic |
Structure-wise the chart holds 6 features, led in depth by Deep basin at roughly 35 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 Islay Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Islay Lake is about 35 ft (11 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1967, a decades-old survey (an MNRF lake survey).
Anglers target brook trout on Islay Lake.
Main-lake point is the top-rated area: a point in about 1 ft of water that rates prime for brook trout in spring. The map above holds the full rated-spot list for every 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 Islay 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.
Round Lake 1 mi · West Joco Lake 2 mi · Queminico Lake 3 mi · Caysee Lake 3 mi · Joco Lake 3 mi · Upper Pancake Lake 3 mi · Middle Pancake Lake 4 mi · Annie Lake 4 mi · Pancake Lake 5 mi · Huff Lake 5 mi · Smilsky L. 4 5 mi · Smilsky L. 3 6 mi
See how Islay Lake stacks up: best brook trout lakes in Ontario
More water nearby: Algoma District fishing maps (1026 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.