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Fishing Cosgrave Lake: what the data says
1,479-acre lake near Ontario. The lake tops out around 110 ft. The contours are modeled from the water's real shoreline and maximum depth. Treat them as a rough guide, and never use them for navigation. Below is the species-by-species picture, pulled from the same data the map uses.
Lake Trout fishing at Cosgrave Lake
Spring lake trout on Cosgrave Lake hold shallow, usually 10 to 40 ft. By summer they slide out to 33 to 110 ft, and by winter most fish are in 20 to 80 ft. Deep basin is the standout, a deep basin at roughly 94 ft, rated prime for summer lake trout. Plan around early morning in the warm months. A white tube jig (deep) or a magnum spoon on downrigger covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 33 to 110 ft | dawn | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 10 to 50 ft | dusk & dawn | Heavy casting spoon, Jigging rap over reefs |
| Winter | 20 to 80 ft | dawn | White tube jig, Airplane jig |
Lake Whitefish fishing at Cosgrave Lake
Spring lake whitefish on Cosgrave Lake hold shallow, usually 15 to 45 ft. By summer they slide out to 40 to 90 ft, and by winter most fish are in 25 to 70 ft. Deep basin is the standout, a deep basin at roughly 94 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 | Go-to baits |
|---|---|---|---|
| Spring | 15 to 45 ft | midday & dawn | Small jig + waxworm, Blade bait (small) |
| Summer | 40 to 90 ft | dawn | Blade bait vertical, Small jigging spoon |
| Fall | 8 to 30 ft | dusk | Small spoon (gold), Jig + plastic larva |
| Winter | 25 to 70 ft | midday & dawn | Jigging spoon + bead chain, Tungsten jig + waxie |
Notable structure
- Deep basin: deep basin, around 94 ft
- Break off the point: drop-off, around 50 ft
- Main-lake point: point, around 28 ft
- Secondary point: point, around 28 ft
- Shallow bay flat: weed flat, around 6 ft
- Back-bay flat: weed flat, around 6 ft
Common questions
How deep is Cosgrave Lake?
Cosgrave Lake is about 110 ft at its deepest point. The contours here are modeled from the water's real shape and maximum depth, so treat them as a rough guide.
What fish are in Cosgrave Lake?
Anglers target lake trout, lake whitefish on Cosgrave Lake.
Where is the best fishing spot on Cosgrave Lake?
Deep basin is the top-rated area: a deep basin in about 94 ft of water that rates prime for lake trout in summer. Open the map above to see every rated spot for each species and season.
When is the best time to fish Cosgrave Lake?
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.
Nearby waters
Kilgour Lake · Georgia Lake · Gorge Lake · Lake Jean · Devious Lake · Barbara Lake
See how Cosgrave Lake stacks up: best lake trout lakes in Ontario · best lake whitefish lakes in Ontario
Browse all Ontario fishing maps or every water on DepthScout. How we build these maps. For fishing guidance only, never navigation.