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Rating depth structure for lake trout.
Shared by DepthScout anglers. Exact spots stay private, always.
14-acre lake in Algoma District, Ontario. The lake tops out around 30 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. What the data behind the map says about each species, season by season:
The drawn water covers 14 acres wrapped in 0.8 miles of bank. A middling shoreline index (1.5) gives it some bays to work without being a maze. The shallow band under 15 ft claims about 61% of the surface — that's where the groceries are. The basin spans about 0.3 mi end to end. Algoma District claims this one. Its nearest charted neighbour, Supple Lake, is 1 mi to the east.
Spring lake trout on Gervais L. 9 hold shallow, usually 8 to 30 ft. Depth-wise the year is flat: 9 to 30 ft in summer, 8 to 30 ft once it turns cold. Put Deep basin first on the milk run — a deep basin near 30 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 | 8 to 30 ft | dawn & dusk | Main-lake point (8 ft) | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 9 to 30 ft | dawn | Deep basin (30 ft) | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 6 to 30 ft | dusk & dawn | Main-lake point (8 ft) | Heavy casting spoon, Jigging rap over reefs |
| Winter | 8 to 30 ft | dawn | Deep basin (30 ft) | White tube jig, Airplane jig |
Structure-wise the chart holds 3 features, led in depth by Deep basin at roughly 30 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 Gervais L. 9 specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Gervais L. 9 is about 30 ft (9 m) deep at its deepest point. 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.
Anglers target lake trout on Gervais L. 9.
Deep basin is the top-rated area: a deep basin in about 30 ft of water that rates prime for lake trout in summer. The interactive chart above rates every 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 Gervais L. 9 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.
Supple Lake 1 mi · Gervais L. 11 1 mi · Barn Lake 1 mi · Gervais L. 13 2 mi · Fifty-five Mile Lake 2 mi · Airport Lake 2 mi · Beebe L. 97 2 mi · Hotte L. 64 3 mi · Gervais L. 1 3 mi · Foucault L. 10 3 mi · Gervais L. 78 4 mi · Jeanne Lake 4 mi
See how Gervais L. 9 stacks up: best lake 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.