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276-acre lake in Algoma District, Ontario. The lake tops out around 100 ft. The depth data here comes from a transect sounding survey by the Ontario MNRF. Every species below gets its seasonal read from the same numbers driving the chart.
Drawn out, this is 263 acres of water rimmed by 4.6 miles of bank, broken up by an island. The shoreline is moderately structured (index 2) — enough points and pockets to pattern. 26% of the surface is littoral (under ~15 ft) — cover, weeds and forage water. The basin spans about 1 mi end to end and 0.9 mi across at its widest. The water lies in Algoma District. For a second option, Quimby Lake lies 2 mi east.
In spring, lake trout run shallow here, mostly 10 to 40 ft. Summer pushes them deeper, 30 to 100 ft, and winter fish settle into 20 to 80 ft. Deep basin is the standout, a deep basin at roughly 100 ft, rated prime for summer lake trout. Time it for early morning. You won't need more than a white tube jig (deep) or a magnum spoon on downrigger most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Main-lake point (17 ft) | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 30 to 100 ft | dawn | Deep basin (100 ft) | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 10 to 50 ft | dusk & dawn | Main-lake point (17 ft) | Heavy casting spoon, Jigging rap over reefs |
| Winter | 20 to 80 ft | dawn | Break off the point (76 ft) | White tube jig, Airplane jig |
Spring lake whitefish on Mathers L. 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. The chart's best answer is Break off the point — drop-off, 76 ft, prime for summer. Prime time lands in early morning. The summer box starts with a blade bait vertical or a small jigging spoon.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 15 to 45 ft | midday & dawn | open water | Small jig + waxworm, Blade bait (small) |
| Summer | 40 to 90 ft | dawn | Break off the point (76 ft) | Blade bait vertical, Small jigging spoon |
| Fall | 8 to 30 ft | dusk | Main-lake point (17 ft) | Small spoon (gold), Jig + plastic larva |
| Winter | 25 to 70 ft | midday & dawn | Break off the point (76 ft) | Jigging spoon + bead chain, Tungsten jig + waxie |
Spring rock bass on Mathers L. hold shallow, usually 2 to 10 ft. By summer they slide out to 5 to 20 ft, and by winter most fish are in 12 to 30 ft. The chart's best answer is Main-lake point — point, 17 ft, prime for summer. Prime time lands in the evening. The summer box starts with a ned rig (small) or a marabou jig.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | midday & dawn | Secondary point (9 ft) | 1/16 oz jig + grub, Small inline spinner |
| Summer | 5 to 20 ft | dusk | Main-lake point (17 ft) | Ned rig (small), Marabou jig |
| Fall | 8 to 22 ft | midday | Main-lake point (17 ft) | Small tube jig, Inline spinner |
| Winter | 12 to 30 ft | midday | Deep basin (100 ft) | Tungsten jig + plastic, Small spoon + spike |
Count 6 structure marks on this chart. The deepest, Deep basin, sits near 100 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 Mathers L. specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Mathers L. is about 100 ft (30 m) deep at its deepest point. The depth data here comes from a transect sounding survey by the Ontario MNRF.
Anglers target lake trout, lake whitefish, rock bass on Mathers L..
Deep basin is the top-rated area: a deep basin in about 100 ft of water that rates prime for lake trout in summer. The map above holds the full rated-spot list for every species and season.
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.
Fishing on Mathers L. 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.
Quimby Lake 2 mi · Gullbeak Lake 2 mi · Mink Lake 2 mi · Rossmere Lake 3 mi · Elliot L. 4 mi · Pistol Lake 4 mi · Little Moon Lake 4 mi · Slipper Lake 4 mi · Second Lake 5 mi · First Lake 5 mi · Esten Lake 5 mi · McGiverin Lake 5 mi
See how Mathers L. stacks up: best lake trout lakes in Ontario · best lake whitefish lakes in Ontario · best rock bass lakes in Ontario
More water nearby: Algoma District fishing maps (1026 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.