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97-acre lake in Parry Sound District, Ontario. The lake tops out around 45 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 1971, 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.
Mason Lake maps at 97 acres behind 2.3 miles of shoreline. A middling shoreline index (1.6) gives it some bays to work without being a maze. The shallow band under 15 ft claims about 78% of the surface — that's where the groceries are. Tip to tip the water measures near 0.6 mi with a 0.5-mi widest point. It sits in Parry Sound District. Its nearest charted neighbour, Loon Lake, is 2 mi to the northeast.
Spring puts yellow perch in skinny water — 3 to 12 ft is the zone. Warm water sends them out to 10 to 30 ft; cold water stacks them in 15 to 35 ft. Deep basin is the standout, a deep basin at roughly 40 ft, rated prime for fall yellow perch. Plan around early morning in the warm months. A drop-shot micro plastics or a small spoon tipped with worm covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Shallow bay flat (1 ft) | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 10 to 30 ft | dawn | Break off the point (2 ft) | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 12 to 35 ft | midday | Deep basin (40 ft) | Jigging spoon (small), Perch rig / spreader |
| Winter | 15 to 35 ft | midday & dawn | Deep basin (40 ft) | Tungsten jig + spikes, Rattle spoon (small) |
Spring smallmouth bass on Mason Lake hold shallow, usually 3 to 12 ft. They move out to 10 to 30 ft in summer and finish the year down in 20 to 45 ft. Put Deep basin first on the milk run — a deep basin near 40 ft that grades good for winter. The feeding windows run early morning and the evening. The summer box starts with a drop shot (goby/minnow) or a ned rig.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dawn & dusk | Main-lake point (1 ft) | Ned rig, Tube jig |
| Summer | 10 to 30 ft | dawn & dusk | Break off the point (2 ft) | Drop shot (goby/minnow), Ned rig |
| Fall | 8 to 25 ft | midday & dawn | Main-lake point (1 ft) | Jerkbait, Blade bait |
| Winter | 20 to 45 ft | midday | Deep basin (40 ft) | Blade bait, Hair jig |
Structure-wise the chart holds 6 features, led in depth by Deep basin at roughly 40 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 Mason Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Mason Lake is about 45 ft (14 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1971, a decades-old survey (an MNRF lake survey).
Anglers target yellow perch, smallmouth bass on Mason Lake.
Deep basin is the top-rated area: a deep basin in about 40 ft of water that rates prime for yellow perch in fall. The map above holds the full rated-spot list for every species and season.
For yellow perch, 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 Mason 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 2 mi · Tea Lake 2 mi · Kelsey Lake 2 mi · Larson Lake 3 mi · Himbury Lake 3 mi · Grass Lake 3 mi · Sand Lake 3 mi · Island Lake 3 mi · Beaver Lake 4 mi · Crooked Lake 4 mi · Pickerel Lake 4 mi · Deer Lake 5 mi
See how Mason Lake stacks up: best smallmouth bass lakes in Ontario · best yellow perch lakes in Ontario
More water nearby: Parry Sound District fishing maps (441 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.