Sign inSign up free Sign inSign up free Sign inSign up freeLake depth chart
Today's read
Shared by DepthScout anglers. Exact spots stay private, always.
13-acre lake in Sudbury District, Ontario. The lake tops out around 27 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 (a transect sounding survey). The season-by-season read for each species follows, from the map's own numbers.
The outline encloses 13 acres, worked by 0.6 miles of shoreline. At index 1.3 the outline is almost a bowl — read the depth changes, not the shoreline. 77% of the surface is littoral (under ~15 ft) — cover, weeds and forage water. Sudbury District claims this one. Loon Lake sits 0 mi northwest — the closest neighbouring chart.
Early season brook trout use the shallows, holding in 2 to 15 ft. Summer is an 8 to 27 ft game here, winter a 3 to 20 ft one. The chart's best answer is Deep basin — deep basin, 20 ft, prime for summer. Best bite is early morning and the evening. Tie on a small spoon fished deep or a trolled lake-clear wobbler + worm and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Shallow bay flat (1 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 8 to 27 ft | dawn & dusk | Deep basin (20 ft) | 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 | Deep basin (20 ft) | Small jigging spoon, Tungsten jig + plastic |
Come spring, look for brown bullhead tight to the bank in 2 to 8 ft. They move out to 3 to 12 ft in summer and finish the year down in 10 to 25 ft. If you only fish one area, make it Deep basin: a deep basin around 20 ft that scores prime in winter. Best bite is after dark and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | dusk & night | Shallow bay flat (1 ft) | |
| Summer | 3 to 12 ft | night & dusk | Shallow bay flat (1 ft) | |
| Fall | 5 to 15 ft | dusk | open water | |
| Winter | 10 to 25 ft | midday | Deep basin (20 ft) |
Count 4 structure marks on this chart. The deepest, Deep basin, sits near 20 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 Johnson Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Johnson Lake is about 27 ft (8 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1967, a decades-old survey (a transect sounding survey).
Anglers target brook trout, brown bullhead on Johnson Lake.
Deep basin is the top-rated area: a deep basin in about 20 ft of water that rates prime for brown bullhead in winter. The interactive chart above rates every spot for each 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 Johnson 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.
Loon Lake 0 mi · Moon Lake 1 mi · Dowes Lake 1 mi · Shoe L. 2 mi · Clear Lake 2 mi · Bannerman Lake 3 mi · Geneva Lake 3 mi · Key L. 3 mi · Soucie Lake 3 mi · Mousseau Lake 5 mi · Benson Lake 6 mi · Munster Lake 7 mi
See how Johnson Lake stacks up: best brook trout lakes in Ontario · best brown bullhead lakes in Ontario
More water nearby: Sudbury District fishing maps (868 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.