Sign inSign up free Sign inSign up free Sign inSign up freeShared by DepthScout anglers. Exact spots stay private, always.
763-acre lake in Algoma District, Ontario. The lake tops out around 110 ft. 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.
Start shallow in spring: lake trout sit in 10 to 40 ft that time of year. Warm water sends them out to 33 to 110 ft; cold water stacks them in 20 to 80 ft. Top water on the chart: Deep basin, a deep basin in the 110 ft range, prime in summer. Fish it in early morning and you'll meet the bite. Throw a white tube jig (deep) or a magnum spoon on downrigger until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Break off the point (46 ft) | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 33 to 110 ft | dawn | Deep basin (110 ft) | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 10 to 50 ft | dusk & dawn | Break off the point (46 ft) | Heavy casting spoon, Jigging rap over reefs |
| Winter | 20 to 80 ft | dawn | Break off the point (46 ft) | White tube jig, Airplane jig |
When the water first warms, lake whitefish slide up into 15 to 45 ft. Summer is a 40 to 90 ft game here, winter a 25 to 70 ft one. Start at Break off the point. It's a drop-off holding about 46 ft of water and rates prime come summer. The feeding windows run early morning. Keep a blade bait vertical or a small jigging spoon rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 15 to 45 ft | midday & dawn | Break off the point (46 ft) | Small jig + waxworm, Blade bait (small) |
| Summer | 40 to 90 ft | dawn | Break off the point (46 ft) | Blade bait vertical, Small jigging spoon |
| Fall | 8 to 30 ft | dusk | open water | Small spoon (gold), Jig + plastic larva |
| Winter | 25 to 70 ft | midday & dawn | Break off the point (46 ft) | Jigging spoon + bead chain, Tungsten jig + waxie |
When the water first warms, rock bass slide up into 2 to 10 ft. Summer is a 5 to 20 ft game here, winter a 12 to 30 ft one. Start at Dock / pier line. It's a dock line holding about 2 ft of water and rates prime come spring. The feeding windows run the evening. Keep a ned rig (small) or a marabou jig rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | midday & dawn | Dock / pier line (2 ft) | 1/16 oz jig + grub, Small inline spinner |
| Summer | 5 to 20 ft | dusk | Main-lake point (1 ft) | Ned rig (small), Marabou jig |
| Fall | 8 to 22 ft | midday | Break off the point (46 ft) | Small tube jig, Inline spinner |
| Winter | 12 to 30 ft | midday | Deep basin (110 ft) | Tungsten jig + plastic, Small spoon + spike |
The spring pattern is a shallow one: brown bullhead in 2 to 8 ft. Midsummer fish sit out in 3 to 12 ft before dropping to 10 to 25 ft for winter. The spot to know is Shallow bay flat, a weed flat in about 1 ft of water that rates prime for brown bullhead in spring. Plan around after dark and the evening in the warm months.
| 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 (110 ft) |
Start shallow in spring: burbot sit in 25 to 70 ft that time of year. Warm water sends them out to 33 to 110 ft; cold water stacks them in 15 to 60 ft. Top water on the chart: Deep basin, a deep basin in the 110 ft range, prime in summer. Fish it in after dark and midday and you'll meet the bite. Throw a heavy jig + cut bait until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 25 to 70 ft | night & dusk | Break off the point (46 ft) | Glow jigging spoon + cut bait, Rattle bait (dark) |
| Summer | 33 to 110 ft | night & midday | Deep basin (110 ft) | Heavy jig + cut bait |
| Fall | 30 to 80 ft | night & dusk | Break off the point (46 ft) | Glow spoon + minnow head, Blade bait (slow) |
| Winter | 15 to 60 ft | night & dusk | Break off the point (46 ft) | Glow tungsten + cut bait, Rattle spoon + minnow head |
8 pieces of structure are mapped here — Deep basin, around 110 ft, is the deepest of them.
Access data: OpenStreetMap contributors (ODbL) — community-mapped launches. 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 Semiwite Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Semiwite Lake is about 110 ft (34 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 lake trout, lake whitefish, rock bass, brown bullhead, burbot on Semiwite Lake.
Deep basin is the top-rated area: a deep basin in about 110 ft of water that rates prime for lake trout in summer. The interactive chart above rates every spot for each species and season.
For lake trout, 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 Semiwite 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.
Helenbar Lake 1 mi · Ompa Lake 2 mi · Lolligag Lake 2 mi · Wolf Lake 2 mi · Jim Christ Lake 2 mi · Lake Twentythree 2 mi · Survey Lake 2 mi · Gashen Lake 2 mi · Fullerton Lake 3 mi · Maybe L. 3 mi · Hook L. 3 mi · Ellisam Lake 3 mi
See how Semiwite Lake stacks up: best lake trout lakes in Ontario · best lake whitefish lakes in Ontario · best burbot lakes in Ontario · best rock bass 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.