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353-acre lake in Kenora District, Ontario. The lake tops out around 43 ft. The depth chart comes from Ontario Ministry of Natural Resources and Forestry bathymetric survey data, so the contours are survey-derived rather than computer-modeled. The depth data here comes from the Ontario MNRF survey of 1978, a decades-old survey (an MNRF lake survey). Every species below gets its seasonal read from the same numbers driving the chart.
Drawn out, this is 353 acres of water rimmed by 4.8 miles of bank. Index 1.8 on the shoreline: a few honest points and pockets, nothing labyrinthine. Roughly 73% of the water is 15 ft or less, the band where the food chain lives. Tip to tip the water measures near 1.5 mi with a 0.7-mi widest point. You'll find it in Kenora District. Closest neighbour on DepthScout: Kirk Lake, 2 mi east of here.
When the water first warms, cisco (lake herring) slide up into 10 to 40 ft. Summer is a 13 to 43 ft game here, winter a 13 to 43 ft one. Start at Deep basin. It's a deep basin holding about 39 ft of water and rates prime come spring. The feeding windows run early morning. Keep a vertical flutter spoon (small) or a drop-shot micro plastic rigged through the warm months.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Deep basin (39 ft) | Small silver spoon, Tiny swim jig (white) |
| Summer | 13 to 43 ft chart-limited; documented 40 to 80 ft | dawn | Deep basin (39 ft) | Vertical flutter spoon (small), Drop-shot micro plastic |
| Fall | 5 to 25 ft | dusk & dawn | Break off the point (15 ft) | Small casting spoon, Inline spinner (silver) |
| Winter | 13 to 43 ft chart-limited; documented 20 to 60 ft | dawn | Deep basin (39 ft) | Small jigging spoon (glow/silver), Tungsten jig + minnow head |
Spring yellow perch on Mullen Lake hold shallow, usually 3 to 12 ft. They move out to 10 to 30 ft in summer and finish the year down in 15 to 35 ft. Put Break off the point first on the milk run — a drop-off near 15 ft that grades prime for summer. The feeding windows run early morning. The summer box starts with a drop-shot micro plastics or a small spoon tipped with worm.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Shallow bay flat (1 ft) | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 10 to 30 ft | dawn | Break off the point (15 ft) | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 12 to 35 ft | midday | Break off the point (15 ft) | Jigging spoon (small), Perch rig / spreader |
| Winter | 15 to 35 ft | midday & dawn | Deep basin (39 ft) | Tungsten jig + spikes, Rattle spoon (small) |
Spring puts northern pike in skinny water — 2 to 8 ft is the zone. Warm water sends them out to 8 to 20 ft; cold water stacks them in 5 to 15 ft. Break off the point is the standout, a drop-off at roughly 15 ft, rated prime for fall northern pike. Plan around early morning and the evening in the warm months. A bucktail or a weedless spoon over cabbage covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (1 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 8 to 20 ft | dawn & dusk | Break off the point (15 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Break off the point (15 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Break off the point (15 ft) | Tip-ups, Large jigging spoon |
6 pieces of structure are mapped here — Deep basin, around 39 ft, is the deepest of them.
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 Mullen Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Mullen Lake is about 43 ft (13 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1978, a decades-old survey (an MNRF lake survey).
Anglers target cisco (lake herring), yellow perch, northern pike on Mullen Lake.
Deep basin is the top-rated area: a deep basin in about 39 ft of water that rates prime for cisco (lake herring) in spring. 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 Mullen 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.
Kirk Lake 2 mi · Hidden Lake 4 mi · Pape Lake 5 mi · Legros Lake 6 mi · Supee Lake 6 mi · Forty Mile Lake 6 mi · Botsford Lake 7 mi · Split Lake 7 mi · Deception Lake 7 mi · Abram Lake 8 mi · Zarn Lake 8 mi · Gall Lake 8 mi
See how Mullen Lake stacks up: best northern pike lakes in Ontario · best yellow perch lakes in Ontario · best cisco (lake herring) lakes in Ontario
More water nearby: Kenora District fishing maps (1173 charts). Browse all Ontario fishing maps. See every water on DepthScout. Bathymetry: published agency survey data. 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.