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266-acre lake in Rainy River District, Ontario. The lake tops out around 46 ft. The depth data here comes from the Ontario MNRF survey of 1990 (a transect sounding survey). Every species below gets its seasonal read from the same numbers driving the chart.
The outline encloses 267 acres, worked by 6 miles of shoreline, with 2 islands in the mix. That shoreline is heavily fingered (development index 2.6) — bays, points and pockets everywhere, which multiplies the fishable edge. About 76% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. The basin spans about 1.3 mi end to end and 0.8 mi across at its widest. Rainy River District claims this one. If the bite dies, Knight Lake is 1 mi to the west.
Spring puts lake whitefish in skinny water — 15 to 45 ft is the zone. Warm water sends them out to 14 to 46 ft; cold water stacks them in 14 to 46 ft. Deep basin is the standout, a deep basin at roughly 46 ft, rated prime for summer lake whitefish. Plan around early morning in the warm months. A blade bait vertical or a small jigging spoon covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 15 to 45 ft | midday & dawn | Break off the point (2 ft) | Small jig + waxworm, Blade bait (small) |
| Summer | 14 to 46 ft | dawn | Deep basin (46 ft) | Blade bait vertical, Small jigging spoon |
| Fall | 8 to 30 ft | dusk | Break off the point (2 ft) | Small spoon (gold), Jig + plastic larva |
| Winter | 14 to 46 ft | midday & dawn | Deep basin (46 ft) | Jigging spoon + bead chain, Tungsten jig + waxie |
Start shallow in spring: walleye sit in 4 to 15 ft that time of year. Summer pushes them deeper, 15 to 35 ft, and winter fish settle into 20 to 40 ft. The spot to know is Deep basin, a deep basin in about 46 ft of water that rates prime for walleye in winter. Warm-month bites cluster around the evening and early morning. Throw a crawler harness on bottom bouncer or a deep crankbait (trolled) until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 4 to 15 ft | dusk & dawn | Main-lake point (2 ft) | 1/8 oz jig + minnow, Hair jig |
| Summer | 15 to 35 ft | dusk & dawn | Break off the point (2 ft) | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 12 to 40 ft | dusk & night | Break off the point (2 ft) | Jigging rap, Jig + big minnow |
| Winter | 20 to 40 ft | dusk & dawn | Deep basin (46 ft) | Jigging spoon + minnow head, Rattle bait |
Spring northern pike on Caldwell Lake hold shallow, usually 2 to 8 ft. By summer they slide out to 8 to 20 ft, and by winter most fish are in 5 to 15 ft. The chart's best answer is Shallow bay flat — weed flat, 2 ft, prime for spring. Prime time lands in early morning and the evening. The summer box starts with a bucktail or a weedless spoon over cabbage.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (2 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 8 to 20 ft | dawn & dusk | Shallow bay flat (2 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Shallow bay flat (2 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Shallow bay flat (2 ft) | Tip-ups, Large jigging spoon |
Caldwell Lake carries 6 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 46 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 Caldwell Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Caldwell Lake is about 46 ft (14 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1990 (a transect sounding survey).
Anglers target lake whitefish, walleye, northern pike on Caldwell Lake.
Deep basin is the top-rated area: a deep basin in about 46 ft of water that rates prime for lake whitefish in summer. Open the map above to see every rated spot for each 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 Caldwell 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.
Knight Lake 1 mi · Sunshine Lake 2 mi · Crowrock Lake 2 mi · Dashwa Lake 3 mi · Williamson Lake 3 mi · Eye Lake 4 mi · Another Lake 4 mi · Forsberg Lake 5 mi · Dragon Lake 5 mi · Nevison Lake 5 mi · Little Eye Lake 6 mi · Potts Lake 6 mi
See how Caldwell Lake stacks up: best walleye lakes in Ontario · best northern pike lakes in Ontario · best lake whitefish lakes in Ontario
More water nearby: Rainy River District fishing maps (257 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.