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43-acre lake in Haliburton County, Ontario. The lake tops out around 13 ft. The depth data here comes from a transect sounding survey by the Ontario MNRF. Species by species, here's what the data says the year looks like.
On the chart, Mountain Lake draws 43 acres inside 1.2 miles of shoreline. At index 1.4 the outline is almost a bowl — read the depth changes, not the shoreline. Nothing on this chart breaks 15 ft, which makes the whole surface littoral: weeds, bait and ambush cover everywhere. End to end it runs roughly 0.4 mi, about 0.3 mi across. You'll find it in Haliburton County. For a second option, Cockle Lake lies 0 mi east.
In spring, smallmouth bass run shallow here, mostly 3 to 12 ft. Midsummer fish sit out in 4 to 13 ft before dropping to 4 to 13 ft for winter. Fall smallmouth bass concentrate at Secondary point, a prime-rated point around 4 ft. Fish it in early morning and the evening and you'll meet the bite. You won't need more than a drop shot (goby/minnow) or a ned rig most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dawn & dusk | Secondary point (4 ft) | Ned rig, Tube jig |
| Summer | 4 to 13 ft | dawn & dusk | Secondary point (4 ft) | Drop shot (goby/minnow), Ned rig |
| Fall | 4 to 13 ft | midday & dawn | Secondary point (4 ft) | Jerkbait, Blade bait |
| Winter | 4 to 13 ft | midday | Break off the point (3 ft) | Blade bait, Hair jig |
Spring puts largemouth bass in skinny water — 2 to 10 ft is the zone. Warm water sends them out to 4 to 13 ft; cold water stacks them in 4 to 13 ft. Shallow bay flat is the standout, a weed flat at roughly 2 ft, rated prime for spring largemouth bass. Plan around early morning and the evening in the warm months. A texas-rigged 10" worm or a deep-diving crankbait covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | dawn & dusk | Shallow bay flat (2 ft) | Spinnerbait, Chatterbait |
| Summer | 4 to 13 ft | dawn & dusk | Secondary point (4 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 3 to 13 ft | midday & dawn | Secondary point (4 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 4 to 13 ft | midday | Break off the point (3 ft) | Blade bait, Jigging spoon |
Count 5 structure marks on this chart. The deepest, Deep basin, sits near 13 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 Mountain Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Mountain Lake is about 13 ft (4 m) deep at its deepest point. The depth data here comes from a transect sounding survey by the Ontario MNRF.
Anglers target smallmouth bass, largemouth bass on Mountain Lake.
Secondary point is the top-rated area: a point in about 4 ft of water that rates prime for smallmouth bass in fall. The map above holds the full rated-spot list for every 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 Mountain 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.
Cockle Lake 0 mi · Little Esson Lake 1 mi · Clement Lake 2 mi · Esson Lake 2 mi · Wilbermere Lake 2 mi · Grace Lake 3 mi · Yankton Lake 3 mi · Miskwabi Lake 4 mi · Cardiff Lake 4 mi · Cope Lake 4 mi · Tory Lake 5 mi · Adams Lake 5 mi
See how Mountain Lake stacks up: best largemouth bass lakes in Ontario · best smallmouth bass lakes in Ontario
More water nearby: Haliburton County fishing maps (295 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.