Sign inSign up free Sign inSign up free Sign inSign up freeLake depth chart
Today's read
Rating depth structure for brook trout.
Recent public catches load as you reach this section.
277-acre lake in Thunder Bay District, Ontario. The lake tops out around 160 ft. The depth picture is modeled, anchored to the true shoreline and the water's published max depth — a scouting aid, never a chart to run a boat by. Here's the year, species by species, as the scoring engine sees it.
Drawn out, this is 282 acres of water rimmed by 9.2 miles of bank. With a shoreline index of 3.9, this water is all arms and coves — edge habitat well beyond its acreage. The shallow band under 15 ft claims about 66% of the surface on the model — that's where the groceries are. The basin spans about 1.8 mi end to end and 0.9 mi across at its widest. You'll find it in Thunder Bay District. Closest neighbour on DepthScout: Fishnet Lake, 2 mi south of here.
Start shallow in spring: brook trout sit in 2 to 15 ft that time of year. Summer pushes them deeper, 10 to 30 ft, and winter fish settle into 3 to 20 ft. The spot to know is Shallow bay flat, a weed flat in about 6 ft of water that rates good for brook trout in spring. Warm-month bites cluster around early morning and the evening. Throw a small spoon fished deep or a trolled lake-clear wobbler + worm until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Shallow bay flat (6 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | open water | 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 | Shallow bay flat (6 ft) | Small jigging spoon, Tungsten jig + plastic |
Count 6 structure marks on this chart. The deepest, Deep basin, sits near 136 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 Diablo Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Diablo Lake is about 160 ft (49 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 Diablo Lake.
Shallow bay flat is the top-rated area: a weed flat in about 6 ft of water that rates good for brook trout in spring. Scroll up to the map for the complete spot list by 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 Diablo 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.
Fishnet Lake 2 mi · Box Lake 2 mi · Santoy Lake 3 mi · Eric Lake 3 mi · Sister Lakes 5 mi · Cairngorm Lake 6 mi · Bews Lake 7 mi · Craig Lake 8 mi · Found Lake 9 mi · Foxtrap Lake 10 mi · Ducell Lake 10 mi · Davidson Lake 11 mi
See how Diablo 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.