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78-acre lake in Algoma District, Ontario. The lake tops out around 39 ft. The depth data here comes from the Ontario MNRF survey of 1980 (a transect sounding survey). What follows comes from the same scoring engine that paints the spots above.
Traced from the shoreline, Marsh Lake runs 78 acres with 2.3 miles of edge. Index 1.9 on the shoreline: a few honest points and pockets, nothing labyrinthine. 63% of the surface is littoral (under ~15 ft) — cover, weeds and forage water. Tip to tip the water measures near 0.8 mi with a 0.3-mi widest point. The water lies in Algoma District. Closest neighbour on DepthScout: South Lake, 2 mi southwest of here.
Spring puts smallmouth bass in skinny water — 3 to 12 ft is the zone. As the season builds they drop to 10 to 30 ft, wintering in 12 to 39 ft. Winter smallmouth bass concentrate at Break off the point, a prime-rated drop-off around 12 ft. Warm-month bites cluster around early morning and the evening. A drop shot (goby/minnow) or a ned rig covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dawn & dusk | Main-lake point (3 ft) | Ned rig, Tube jig |
| Summer | 10 to 30 ft | dawn & dusk | Break off the point (12 ft) | Drop shot (goby/minnow), Ned rig |
| Fall | 8 to 25 ft | midday & dawn | Secondary point (7 ft) | Jerkbait, Blade bait |
| Winter | 12 to 39 ft | midday | Break off the point (12 ft) | Blade bait, Hair jig |
When the water first warms, pumpkinseed slide up into 1 to 8 ft. By summer they slide out to 2 to 10 ft, and by winter most fish are in 6 to 18 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 3 ft that scores prime in spring. In summer the feeding windows fall in the evening and early morning. Keep a micro tube or a sponge spider (fly) rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 8 ft | midday & dusk | Shallow bay flat (3 ft) | Micro jig under a float, Tiny beetle-spin |
| Summer | 2 to 10 ft | dusk & dawn | Shallow bay flat (3 ft) | Micro tube, Sponge spider (fly) |
| Fall | 4 to 14 ft | dusk & dawn | Shallow bay flat (3 ft) | Micro jig + waxworm, Small spoon tipped |
| Winter | 6 to 18 ft | dawn | Back-bay flat (15 ft) | Tungsten ice jig + plastic, Tiny spoon |
Count 6 structure marks on this chart. The deepest, Deep basin, sits near 38 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 Marsh Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Marsh Lake is about 39 ft (12 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1980 (a transect sounding survey).
Anglers target smallmouth bass, pumpkinseed on Marsh Lake.
Break off the point is the top-rated area: a drop-off in about 12 ft of water that rates prime for smallmouth bass in winter. Open the map above to see every rated spot for each species and season.
For smallmouth bass, 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 Marsh 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.
South Lake 2 mi · Dunlop Lake 2 mi · Banana Lake 2 mi · Summers Lake 2 mi · Link Lake 2 mi · Evans Lake 2 mi · Gusty Lake 3 mi · Gravelpit Lake 3 mi · Flag Lake 3 mi · Beaver Lake 3 mi · Manydace L. 3 mi · Chub Lake (SSM 184 Lake) 3 mi
See how Marsh Lake stacks up: best smallmouth bass lakes in Ontario · best pumpkinseed lakes in Ontario
More water nearby: Algoma District fishing maps (1026 charts). Browse all Ontario fishing maps or see every water on DepthScout. Bathymetry credit: state fisheries survey programs. 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.