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1,042-acre lake in Thunder Bay District, Ontario. The lake tops out around 33 ft. The depth data here comes from a transect sounding survey by the Ontario MNRF. The season-by-season read for each species follows, from the map's own numbers.
Traced from the shoreline, Bolster Lake runs 1,047 acres with 5.5 miles of edge. Its 1.2 shoreline index means few bank features; the contours below do the pattern work. About 42% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. Call it 2.1 mi long by 1.3 mi wide at the broadest reach. You'll find it in Thunder Bay District. The nearest mapped water is Grace Lake, 5 mi to the southwest.
Start shallow in spring: northern pike sit in 2 to 8 ft that time of year. Warm water sends them out to 8 to 20 ft; cold water stacks them in 5 to 15 ft. Top water on the chart: Shallow bay flat, a weed flat in the 3 ft range, prime in spring. Fish it in early morning and the evening and you'll meet the bite. Throw a bucktail or a weedless spoon over cabbage until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (3 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 8 to 20 ft | dawn & dusk | Main-lake point (8 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Break off the point (7 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Shallow bay flat (3 ft) | Tip-ups, Large jigging spoon |
Bolster Lake carries 6 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 33 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 Bolster Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Bolster Lake is about 33 ft (10 m) deep at its deepest point. The depth data here comes from a transect sounding survey by the Ontario MNRF.
Anglers target northern pike on Bolster Lake.
Shallow bay flat is the top-rated area: a weed flat in about 3 ft of water that rates prime for northern pike in spring. The interactive chart above rates every spot for each species and season.
For northern pike, 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 Bolster 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.
Grace Lake 5 mi · Miminiska Lake 6 mi · Walden Lake 8 mi · Pringle Lake 10 mi · Vick Lake 11 mi · Snowflake Lake 13 mi · Parkhill Lake 13 mi · Lake 68 13 mi · Merpaw Lake 14 mi · Troutfly Lake 15 mi · Nesting Lake 15 mi · Lake L-66 16 mi
See how Bolster Lake stacks up: best northern pike lakes in Ontario
More water nearby: Thunder Bay District fishing maps (662 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.