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3,425-acre lake in Thunder Bay District, Ontario. The lake tops out around 27 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 a transect sounding survey by the Ontario MNRF. Here is how the season plays out for each species, straight from the data behind the map.
Drawn out, this is 3,440 acres of water rimmed by 12.9 miles of bank — 2 islands included. Index 1.6 on the shoreline: a few honest points and pockets, nothing labyrinthine. 74% of the surface is littoral (under ~15 ft) — cover, weeds and forage water. End to end it runs roughly 3.9 mi, about 2.4 mi across. The water lies in Thunder Bay District. Closest neighbour on DepthScout: Bolster Lake, 5 mi northeast of here.
When the water first warms, lake whitefish slide up into 8 to 27 ft. There's no big seasonal slide here — summer means 8 to 27 ft, winter 8 to 27 ft. If you only fish one area, make it Deep basin: a deep basin around 27 ft that scores prime in summer. In summer the feeding windows fall in early morning. Keep a blade bait vertical or a small jigging spoon rigged through the warm months.
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 | 8 to 27 ft chart-limited; documented 15 to 45 ft | midday & dawn | Break off the point (20 ft) | Small jig + waxworm, Blade bait (small) |
| Summer | 8 to 27 ft chart-limited; documented 40 to 90 ft | dawn | Deep basin (27 ft) | Blade bait vertical, Small jigging spoon |
| Fall | 7 to 27 ft chart-limited; documented 8 to 30 ft | dusk | Gravel shoal (3 ft) | Small spoon (gold), Jig + plastic larva |
| Winter | 8 to 27 ft chart-limited; documented 25 to 70 ft | midday & dawn | Deep basin (27 ft) | Jigging spoon + bead chain, Tungsten jig + waxie |
Early season walleye use the shallows, holding in 4 to 15 ft. Summer is an 8 to 27 ft game here, winter an 8 to 27 ft one. The chart's best answer is Break off the point — drop-off, 20 ft, prime for fall. Best bite is the evening and early morning. Tie on a crawler harness on bottom bouncer or a deep crankbait (trolled) 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 | 4 to 15 ft | dusk & dawn | Gravel shoal (3 ft) | 1/8 oz jig + minnow, Hair jig |
| Summer | 8 to 27 ft chart-limited; documented 15 to 35 ft | dusk & dawn | Break off the point (20 ft) | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 8 to 27 ft chart-limited; documented 12 to 40 ft | dusk & night | Break off the point (20 ft) | Jigging rap, Jig + big minnow |
| Winter | 8 to 27 ft chart-limited; documented 20 to 40 ft | dusk & dawn | Deep basin (27 ft) | Jigging spoon + minnow head, Rattle bait |
Spring puts northern pike in skinny water — 2 to 8 ft is the zone. As the season builds they drop to 8 to 20 ft, wintering in 5 to 15 ft. Spring northern pike concentrate at Weed flat, a prime-rated weed flat around 2 ft. Warm-month bites cluster around early morning and the evening. A bucktail or a weedless spoon over cabbage covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Weed flat (2 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 8 to 20 ft | dawn & dusk | Break off the point (20 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Sharp break (7 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Weed flat (2 ft) | Tip-ups, Large jigging spoon |
Structure-wise the chart holds 11 features, led in depth by Deep basin at roughly 27 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 Grace Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Grace Lake is about 27 ft (8 m) deep at its deepest point. The depth data here comes from a transect sounding survey by the Ontario MNRF.
Anglers target lake whitefish, walleye, northern pike on Grace Lake.
Deep basin is the top-rated area: a deep basin in about 27 ft of water that rates prime for lake whitefish in summer. The map above holds the full rated-spot list for every species and season.
For lake whitefish, 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 Grace 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.
Bolster Lake 5 mi · Pringle Lake 6 mi · Miminiska Lake 10 mi · Snowflake Lake 10 mi · Vick Lake 10 mi · Walden Lake 11 mi · Parkhill Lake 11 mi · Lake 68 14 mi · Merpaw Lake 15 mi · Lake L-66 16 mi · Shabuskwia Lake 16 mi · Weese Lake 16 mi
See how Grace Lake stacks up: best walleye lakes in Ontario · best northern pike lakes in Ontario · best lake whitefish lakes in Ontario
More water nearby: Thunder Bay District fishing maps (662 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.