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15-acre lake in Grey County, Ontario. The lake tops out around 9 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. What the data behind the map says about each species, season by season:
Drawn out, this is 16 acres of water rimmed by 1.2 miles of bank. The shoreline is moderately structured (index 2.1) — enough points and pockets to pattern. Nothing on this chart breaks 15 ft, which makes the whole surface littoral: weeds, bait and ambush cover everywhere. Call it 0.4 mi long. You'll find it in Grey County. Closest neighbour on DepthScout: Greins P., 2 mi west of here.
In spring, brook trout run shallow here, mostly 1 to 9 ft. Summer keeps them at 3 to 9 ft, and they winter in 1 to 9 ft. Deep basin is the standout, a deep basin at roughly 8 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.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 9 ft | dawn & dusk | Main-lake point (8 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 3 to 9 ft | dawn & dusk | Deep basin (8 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 1 to 9 ft | midday & dawn | Main-lake point (8 ft) | Small spoon (orange), Spinner |
| Winter | 1 to 9 ft | dawn | Deep basin (8 ft) | Small jigging spoon, Tungsten jig + plastic |
Holstein Dam carries 4 mapped structure features, topping out (or rather bottoming out) at Main-lake point, about 8 ft down.
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 Holstein Dam specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Holstein Dam is about 9 ft (3 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 Holstein Dam.
Deep basin is the top-rated area: a deep basin in about 8 ft of water that rates prime for brook trout in summer. 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 Holstein Dam 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.
Greins P. 2 mi · Matthews Lake 4 mi · Wilder Lake 6 mi · Durham Town P. 9 mi · Turner Lake 13 mi · Tobermory Lake 14 mi · Bentinck L. E1 14 mi · Westfall's Lake 15 mi · Irish Lake 15 mi · Wilcox Lake 15 mi · Welbeck Mill Pond 16 mi · Marl Lake 16 mi
See how Holstein Dam stacks up: best brook trout lakes in Ontario
More water nearby: Grey County fishing maps (47 charts). Browse all Ontario fishing maps or 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.