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892-acre lake in Sudbury District, Ontario. The lake tops out around 60 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.
The drawn water covers 896 acres wrapped in 22.4 miles of bank — 9 islands included. The 5.3 development index tells the story — a convoluted bank whose fishable edge far outruns the acreage. About 81% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. Call it 3.5 mi long by 1.8 mi wide at the broadest reach. It sits in Sudbury District. If the bite dies, Pickle Lake is 4 mi to the southwest.
Spring puts cisco (lake herring) in skinny water — 10 to 40 ft is the zone. As the season builds they drop to 18 to 60 ft, wintering in 20 to 60 ft. Summer cisco (lake herring) concentrate at Deep basin, a prime-rated deep basin around 58 ft. Warm-month bites cluster around early morning. A vertical flutter spoon (small) or a drop-shot micro plastic covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Deep basin (58 ft) | Small silver spoon, Tiny swim jig (white) |
| Summer | 18 to 60 ft | dawn | Deep basin (58 ft) | Vertical flutter spoon (small), Drop-shot micro plastic |
| Fall | 5 to 25 ft | dusk & dawn | Break off the point (3 ft) | Small casting spoon, Inline spinner (silver) |
| Winter | 20 to 60 ft | dawn | Deep basin (58 ft) | Small jigging spoon (glow/silver), Tungsten jig + minnow head |
Start shallow in spring: walleye sit in 4 to 15 ft that time of year. Warm water sends them out to 15 to 35 ft; cold water stacks them in 20 to 40 ft. Top water on the chart: Main-lake point, a point in the 5 ft range, prime in spring. Fish it in the evening and early morning and you'll meet the bite. 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 (5 ft) | 1/8 oz jig + minnow, Hair jig |
| Summer | 15 to 35 ft | dusk & dawn | Shallow feeding flat (18 ft) | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 12 to 40 ft | dusk & night | Break off the point (3 ft) | Jigging rap, Jig + big minnow |
| Winter | 20 to 40 ft | dusk & dawn | Deep basin (58 ft) | Jigging spoon + minnow head, Rattle bait |
Early season burbot use the shallows, holding in 18 to 60 ft. Even in summer they hold at 18 to 60 ft; winter keeps them in 15 to 60 ft. Put Deep basin first on the milk run — a deep basin near 58 ft that grades prime for spring. In summer the feeding windows fall in after dark and midday. Tie on a heavy jig + cut bait and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 18 to 60 ft | night & dusk | Deep basin (58 ft) | Glow jigging spoon + cut bait, Rattle bait (dark) |
| Summer | 18 to 60 ft | night & midday | Deep basin (58 ft) | Heavy jig + cut bait |
| Fall | 18 to 60 ft | night & dusk | Deep basin (58 ft) | Glow spoon + minnow head, Blade bait (slow) |
| Winter | 15 to 60 ft | night & dusk | Deep basin (58 ft) | Glow tungsten + cut bait, Rattle spoon + minnow head |
Count 8 structure marks on this chart. The deepest, Deep basin, sits near 58 ft.
Access data: Land Information Ontario — Fishing Access Point. Confirm conditions and fees locally before you launch.
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 Ash Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Ash Lake is about 60 ft (18 m) deep at its deepest point. The depth data here comes from a transect sounding survey by the Ontario MNRF.
Anglers target cisco (lake herring), walleye, burbot on Ash Lake.
Deep basin is the top-rated area: a deep basin in about 58 ft of water that rates prime for cisco (lake herring) in summer. The map above holds the full rated-spot list for every species and season.
For cisco (lake herring), 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 Ash 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.
Pickle Lake 4 mi · Crooked Lake 5 mi · Ogasiwi Lake 5 mi · Haf L. 6 mi · Carry Lake 6 mi · Bader Lake 6 mi · Dog Lake 6 mi · Gee Lake 7 mi · Blackfish Lake 8 mi · Bolkow Lake 8 mi · Buckhorn Lake 9 mi · Ward Lake 9 mi
See how Ash Lake stacks up: best walleye lakes in Ontario · best burbot lakes in Ontario · best cisco (lake herring) lakes in Ontario
More water nearby: Sudbury District fishing maps (868 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.