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42-acre lake in Sudbury District, Ontario. The lake tops out around 72 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 1961, a decades-old survey (an MNRF lake survey). Here is how the season plays out for each species, straight from the data behind the map.
The outline encloses 41 acres, worked by 1.4 miles of shoreline. With a 1.5 development index there's bank structure worth casting at, in moderation. Littoral water — the productive band under ~15 ft — makes up 50% of this chart. End to end it runs roughly 0.4 mi, about 0.3 mi across. It sits in Sudbury District. If the bite dies, Seven Mile Lake is 0 mi to the northeast.
Spring brook trout on Ruth Lake hold shallow, usually 2 to 15 ft. By summer they slide out to 10 to 30 ft, and by winter most fish are in 3 to 20 ft. The chart's best answer is Break off the point — drop-off, 28 ft, prime for summer. Prime time lands in early morning and the evening. The summer box starts with a small spoon fished deep or a trolled lake-clear wobbler + worm.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Main-lake point (1 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Break off the point (28 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (1 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Shallow bay flat (1 ft) | Small jigging spoon, Tungsten jig + plastic |
When the water first warms, splake slide up into 5 to 25 ft. By summer they slide out to 25 to 60 ft, and by winter most fish are in 10 to 45 ft. If you only fish one area, make it Break off the point: a drop-off around 28 ft that scores prime in summer. In summer the feeding windows fall in early morning and the evening. Keep a trolled spoon at the thermocline or a white tube jig (deep) rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 25 ft | dawn & dusk | Main-lake point (1 ft) | Small casting spoon (gold/orange), Inline spinner |
| Summer | 25 to 60 ft | dawn & dusk | Break off the point (28 ft) | Trolled spoon at the thermocline, White tube jig (deep) |
| Fall | 10 to 35 ft | dawn & dusk | Break off the point (28 ft) | Casting spoon, Jerkbait |
| Winter | 10 to 45 ft | dawn | Break off the point (28 ft) | Jigging spoon tipped with minnow head, Small white tube |
Early season rainbow trout use the shallows, holding in 5 to 20 ft. Expect a summer slide to 8 to 30 ft, then a winter hold in 8 to 40 ft. Put Break off the point first on the milk run — a drop-off near 28 ft that grades prime for winter. In summer the feeding windows fall in early morning and the evening. Tie on a dodger + spoon (deep troll) or a flutter spoon and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Main-lake point (1 ft) | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Break off the point (28 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Break off the point (28 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | Break off the point (28 ft) | Jigging spoon, Tube jig (white) |
The chart marks 4 structure features on Ruth Lake; the deepest is Deep basin at about 60 ft.
Access data: Geospatial Ontario - Fishing Access Points. Confirm conditions and fees locally before you launch.
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 Ruth Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Ruth Lake is about 72 ft (22 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1961, a decades-old survey (an MNRF lake survey).
Anglers target brook trout, splake, rainbow trout on Ruth Lake.
Break off the point is the top-rated area: a drop-off in about 28 ft of water that rates prime for splake in summer. 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 Ruth 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.
Seven Mile Lake 0 mi · McLennan Lake 0 mi · Chappise L. 8 1 mi · Moodie Lake 1 mi · Olympic Lake 2 mi · Pack Sack Lake 2 mi · Trap Lake 2 mi · Trap Creek 2 mi · Poulin Lake 3 mi · Wiener Lake 3 mi · Corner L. 3 mi · Louise Lake 3 mi
See how Ruth Lake stacks up: best rainbow trout lakes in Ontario · best brook trout lakes in Ontario · best splake 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.