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Rating depth structure for lake trout.
Shared by DepthScout anglers. Exact spots stay private, always.
564-acre lake in Timiskaming District, Ontario. The lake tops out around 42 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). The season-by-season read for each species follows, from the map's own numbers.
The drawn water covers 565 acres wrapped in 6.4 miles of bank. With a 1.9 development index there's bank structure worth casting at, in moderation. Roughly 94% of the water is 15 ft or less, the band where the food chain lives. End to end it runs roughly 1.5 mi, about 1 mi across. It sits in Timiskaming District. Kittson Lake sits 2 mi northwest — the closest neighbouring chart.
When the water first warms, lake trout slide up into 10 to 40 ft. By summer they slide out to 13 to 42 ft, and by winter most fish are in 11 to 42 ft. If you only fish one area, make it Deep basin: a deep basin around 30 ft that scores prime in summer. In summer the feeding windows fall in early morning. Keep a white tube jig (deep) or a magnum spoon on downrigger rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Break off the point (10 ft) | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 13 to 42 ft | dawn | Deep basin (30 ft) | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 8 to 42 ft | dusk & dawn | Break off the point (10 ft) | Heavy casting spoon, Jigging rap over reefs |
| Winter | 11 to 42 ft | dawn | Deep basin (30 ft) | White tube jig, Airplane jig |
The chart marks 6 structure features on Gullrock Lake; the deepest is Deep basin at about 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 Gullrock Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Gullrock Lake is about 42 ft (13 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 on Gullrock Lake.
Deep basin is the top-rated area: a deep basin in about 30 ft of water that rates prime for lake trout in summer. Scroll up to the map for the complete spot list by 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 Gullrock 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.
Kittson Lake 2 mi · Anima Nipissing Lake 3 mi · Kitt Lake 3 mi · First Justin Lake 3 mi · Shallow Lake 4 mi · South Coleman Lake 4 mi · High Falls Lake 5 mi · Head Lake 5 mi · Bay Lake 5 mi · Little Gillies Lake 5 mi · Diabase Lake 5 mi · Dane L. 18 5 mi
See how Gullrock Lake stacks up: best lake trout lakes in Ontario
More water nearby: Timiskaming District fishing maps (515 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.