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601-acre lake in Rainy River District, Ontario. The lake tops out around 13 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 1984 (an MNRF lake survey). Below is the species-by-species picture, pulled from the same data the map uses.
Traced from the shoreline, Roscoe Lake runs 600 acres with 6.7 miles of edge — one island included. The shoreline is moderately structured (index 1.9) — enough points and pockets to pattern. The whole water is littoral — nothing here runs deeper than ~15 ft, so it's all weed-and-bait territory. Call it 2 mi long by 1 mi wide at the broadest reach. The water lies in Rainy River District. For a second option, Holmes Lake lies 3 mi southeast.
Come spring, look for walleye tight to the bank in 3 to 13 ft. Through summer count on 4 to 13 ft; the winter hold is 4 to 13 ft. If you only fish one area, make it Deep basin: a deep basin around 13 ft that scores prime in winter. Best bite is the evening and early morning. A crawler harness on bottom bouncer or a deep crankbait (trolled) is the honest summer answer here.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 13 ft chart-limited; documented 4 to 15 ft | dusk & dawn | Main-lake point (1 ft) | 1/8 oz jig + minnow, Hair jig |
| Summer | 4 to 13 ft chart-limited; documented 15 to 35 ft | dusk & dawn | Deep basin (13 ft) | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 4 to 13 ft chart-limited; documented 12 to 40 ft | dusk & night | Deep basin (13 ft) | Jigging rap, Jig + big minnow |
| Winter | 4 to 13 ft chart-limited; documented 20 to 40 ft | dusk & dawn | Deep basin (13 ft) | Jigging spoon + minnow head, Rattle bait |
Come spring, look for yellow perch tight to the bank in 3 to 12 ft. Expect a summer slide to 4 to 13 ft, then a winter hold in 4 to 13 ft. Start at Deep basin. It's a deep basin holding about 13 ft of water and rates prime come fall. Prime time lands in early morning. A drop-shot micro plastics or a small spoon tipped with worm is the honest summer answer here.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| 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 | 4 to 13 ft chart-limited; documented 10 to 30 ft | dawn | Deep basin (13 ft) | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 4 to 13 ft chart-limited; documented 12 to 35 ft | midday | Deep basin (13 ft) | Jigging spoon (small), Perch rig / spreader |
| Winter | 4 to 13 ft chart-limited; documented 15 to 35 ft | midday & dawn | Deep basin (13 ft) | Tungsten jig + spikes, Rattle spoon (small) |
Start shallow in spring: northern pike sit in 2 to 8 ft that time of year. Summer pushes them deeper, 4 to 13 ft, and winter fish settle into 4 to 13 ft. The spot to know is Shallow bay flat, a weed flat in about 1 ft of water that rates prime for northern pike in spring. Warm-month bites cluster around early morning and the evening. Throw a bucktail or a weedless spoon over cabbage until the fish tell you otherwise.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (1 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 4 to 13 ft chart-limited; documented 8 to 20 ft | dawn & dusk | Shallow bay flat (1 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 4 to 13 ft chart-limited; documented 6 to 18 ft | midday & dawn | Deep basin (13 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 4 to 13 ft chart-limited; documented 5 to 15 ft | midday | Shallow bay flat (1 ft) | Tip-ups, Large jigging spoon |
Spring puts burbot in skinny water — 4 to 13 ft is the zone. Summer fish stay in 4 to 13 ft, and winter fish hold in 3 to 13 ft. Spring burbot concentrate at Deep basin, a prime-rated deep basin around 13 ft. Warm-month bites cluster around after dark and midday. A heavy jig + cut bait covers the summer program.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 4 to 13 ft chart-limited; documented 25 to 70 ft | night & dusk | Deep basin (13 ft) | Glow jigging spoon + cut bait, Rattle bait (dark) |
| Summer | 4 to 13 ft chart-limited; documented 50 to 120 ft | night & midday | Deep basin (13 ft) | Heavy jig + cut bait |
| Fall | 4 to 13 ft chart-limited; documented 30 to 80 ft | night & dusk | Deep basin (13 ft) | Glow spoon + minnow head, Blade bait (slow) |
| Winter | 3 to 13 ft chart-limited; documented 15 to 60 ft | night & dusk | Deep basin (13 ft) | Glow tungsten + cut bait, Rattle spoon + minnow head |
Early season cisco (lake herring) use the shallows, holding in 3 to 13 ft. Even in summer they hold at 4 to 13 ft; winter keeps them in 4 to 13 ft. Put Deep basin first on the milk run — a deep basin near 13 ft that grades prime for spring. In summer the feeding windows fall in early morning. Tie on a vertical flutter spoon (small) or a drop-shot micro plastic and you're in the game.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 13 ft chart-limited; documented 10 to 40 ft | dawn & dusk | Deep basin (13 ft) | Small silver spoon, Tiny swim jig (white) |
| Summer | 4 to 13 ft chart-limited; documented 40 to 80 ft | dawn | Deep basin (13 ft) | Vertical flutter spoon (small), Drop-shot micro plastic |
| Fall | 3 to 13 ft chart-limited; documented 5 to 25 ft | dusk & dawn | Break off the point (1 ft) | Small casting spoon, Inline spinner (silver) |
| Winter | 4 to 13 ft chart-limited; documented 20 to 60 ft | dawn | Deep basin (13 ft) | Small jigging spoon (glow/silver), Tungsten jig + minnow head |
Roscoe Lake carries 6 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 13 ft down.
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 Roscoe Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Roscoe Lake is about 13 ft (4 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1984 (an MNRF lake survey).
Anglers target walleye, yellow perch, northern pike, burbot, cisco (lake herring) on Roscoe Lake.
Deep basin is the top-rated area: a deep basin in about 13 ft of water that rates prime for walleye in winter. Every other rated spot, per species and season, is on the map above.
For walleye, the summer bite is best in the evening and 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 Roscoe 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.
Holmes Lake 3 mi · Moosetrack Lake 3 mi · Little Moosetrack L. 3 mi · Pettit Lake 3 mi · Sandbeach Lake 4 mi · Manion Lake 4 mi · Mount Lake 8 mi · Roughstone Lake 8 mi · Roman Lake 8 mi · McPherson Lake 9 mi · Bold Lake 9 mi · Dovetail Lake 9 mi
See how Roscoe Lake stacks up: best walleye lakes in Ontario · best northern pike lakes in Ontario · best yellow perch lakes in Ontario · best burbot lakes in Ontario
More water nearby: Rainy River District fishing maps (257 charts). Browse all Ontario fishing maps. 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.