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Rating depth structure for brown bullhead.
Shared by DepthScout anglers. Exact spots stay private, always.
142-acre lake in Muskoka District Municipality, Ontario. The lake tops out around 11 ft. These contours are modeled — built from the real shoreline and the water's maximum depth — so read them as a guide, never as navigation. Species by species, here's what the data says the year looks like.
Traced from the shoreline, Marion Lake runs 142 acres with 2.6 miles of edge. Index 1.6 on the shoreline: a few honest points and pockets, nothing labyrinthine. Every acre of it sits shallower than ~15 ft: one big littoral zone, cover and forage throughout. The basin spans about 1.1 mi end to end and 0.3 mi across at its widest. You'll find it in Muskoka District Municipality. The nearest mapped water is Finlayson Pond #420, 2 mi to the west.
Start shallow in spring: brown bullhead sit in 2 to 8 ft that time of year. Warm water sends them out to 3 to 11 ft; cold water stacks them in 3 to 11 ft. Top water on the chart: Deep basin, a deep basin in the 9 ft range, prime in winter. Fish it in after dark and the evening and you'll meet the bite.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | dusk & night | Shallow bay flat (3 ft) | |
| Summer | 3 to 11 ft | night & dusk | Shallow bay flat (3 ft) | |
| Fall | 3 to 11 ft | dusk | Deep basin (9 ft) | |
| Winter | 3 to 11 ft | midday | Deep basin (9 ft) |
6 pieces of structure are mapped here — Deep basin, around 9 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 Marion Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Marion Lake is about 11 ft (3 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 brown bullhead on Marion Lake.
Deep basin is the top-rated area: a deep basin in about 9 ft of water that rates prime for brown bullhead in winter. The interactive chart above rates every spot for each species and season.
For brown bullhead, the summer bite is best in after dark and the evening. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Marion 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.
Finlayson Pond #420 2 mi · Maggie Lake 2 mi · Nelson Lake 2 mi · Little Nelson Lake 2 mi · Doughnut Lake 3 mi · Upper Centre Nolan L. 3 mi · South Nelson Lake 3 mi · Tasso Lake 3 mi · Norah Lake 4 mi · Clara Lake 4 mi · Whitespruce Lake 4 mi · Flossie Lake 4 mi
See how Marion Lake stacks up: best brown bullhead lakes in Ontario
More water nearby: Muskoka District Municipality fishing maps (276 charts). Browse all Ontario fishing maps or 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.