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1,019-acre lake in Thunder Bay District, Ontario. The lake tops out around 31 ft. The chart is a model: real shoreline, published maximum depth, interpolated in between. A planning tool, never a navigation product. What the data behind the map says about each species, season by season:
On the chart, Mollison Lake draws 1,017 acres inside 11.5 miles of shoreline. A development index of 2.6 means a maze of bays and points: far more casting targets than a round bowl of the same size. Roughly 75% of the water is 15 ft or less as modeled, the band where the food chain lives. End to end it runs roughly 3.8 mi, about 0.9 mi across. The water lies in Thunder Bay District. For a second option, Ansig Lake lies 2 mi north.
Early season lake whitefish use the shallows, holding in 9 to 31 ft. Even in summer they hold at 9 to 31 ft; winter keeps them in 9 to 31 ft. Put Deep basin first on the milk run — a deep basin near 26 ft that grades prime for summer. In summer the feeding windows fall in early morning. Tie on a blade bait vertical or a small jigging spoon and you're in the game.
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 | 9 to 31 ft chart-limited; documented 15 to 45 ft | midday & dawn | Break off the point (14 ft) | Small jig + waxworm, Blade bait (small) |
| Summer | 9 to 31 ft chart-limited; documented 40 to 90 ft | dawn | Deep basin (26 ft) | Blade bait vertical, Small jigging spoon |
| Fall | 8 to 30 ft | dusk | Break off the point (14 ft) | Small spoon (gold), Jig + plastic larva |
| Winter | 9 to 31 ft chart-limited; documented 25 to 70 ft | midday & dawn | Deep basin (26 ft) | Jigging spoon + bead chain, Tungsten jig + waxie |
Early season cisco (lake herring) use the shallows, holding in 8 to 31 ft. Even in summer they hold at 9 to 31 ft; winter keeps them in 9 to 31 ft. Put Deep basin first on the milk run — a deep basin near 26 ft that grades prime for spring. In summer the feeding windows fall in early morning. Tie on a vertical flutter spoon (small) or a drop-shot micro plastic and you're in the game.
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 | 8 to 31 ft chart-limited; documented 10 to 40 ft | dawn & dusk | Deep basin (26 ft) | Small silver spoon, Tiny swim jig (white) |
| Summer | 9 to 31 ft chart-limited; documented 40 to 80 ft | dawn | Deep basin (26 ft) | Vertical flutter spoon (small), Drop-shot micro plastic |
| Fall | 5 to 25 ft | dusk & dawn | Break off the point (14 ft) | Small casting spoon, Inline spinner (silver) |
| Winter | 9 to 31 ft chart-limited; documented 20 to 60 ft | dawn | Deep basin (26 ft) | Small jigging spoon (glow/silver), Tungsten jig + minnow head |
Start shallow in spring: northern pike sit in 2 to 8 ft that time of year. Summer pushes them deeper, 8 to 20 ft, and winter fish settle into 5 to 15 ft. The spot to know is Shallow bay flat, a weed flat in about 4 ft of water that rates prime for northern pike in spring. Warm-month bites cluster around early morning and the evening. Throw a bucktail or a weedless spoon over cabbage until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (4 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 8 to 20 ft | dawn & dusk | Break off the point (14 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 6 to 18 ft | midday & dawn | Break off the point (14 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Shallow bay flat (4 ft) | Tip-ups, Large jigging spoon |
Count 6 structure marks on this chart. The deepest, Deep basin, sits near 26 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 Mollison Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Mollison Lake is about 31 ft (9 m) deep 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.
Anglers target lake whitefish, cisco (lake herring), northern pike on Mollison Lake.
Deep basin is the top-rated area: a deep basin in about 26 ft of water that rates prime for lake whitefish in summer. The map above holds the full rated-spot list for every 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 Mollison 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.
Ansig Lake 2 mi · Greta Lake 3 mi · Springwater Lake 4 mi · Dumbbell Lake 6 mi · Bankfield Lake 7 mi · Fleming Lake 8 mi · Isobel Lake 8 mi · Lyons Lake 9 mi · Cavell Lake 10 mi · Bliss Lake 10 mi · Eaton Lake 12 mi · Treptow Lake 13 mi
See how Mollison Lake stacks up: best northern pike lakes in Ontario · best lake whitefish lakes in Ontario · best cisco (lake herring) lakes in Ontario
More water nearby: Thunder Bay District fishing maps (662 charts). Browse all Ontario fishing maps. See every water on DepthScout. 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.