Marl Lake Depth Map & Fishing Spots (Sudbury District, ON)

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Lake depth chart

Marl Lake, ON

Max 41 ft

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Where to start

Fall shiner run window is on — see the hatch outlook

Hatch outlook

Fall shiner runActive window

Typical here: Sep 1 – Oct 31 · same push on the Ontario side — Simcoe's shiners migrate shallow as the water cools, and the predators ride with them

adultdaylight for the jig bite; after dark the shiners stack under dock lights with walleyes and pike mixed right in — follow the bait, not the spot — millions of shiners move together and the predators ride with them; silver profile and flash matter

Concentrates hard but travels — the school (and the walleyes under it) can be off a river mouth one week and miles upriver the next.

Jig-and-minnow is the event's signature — a frozen emerald shiner on a 1/4 oz jig drifted along the run; silver jerkbaits and trolled crankbaits take the roaming fish; blade baits under the schools.

The event happens over river mouths and the first miles upriver, warming shallow shorelines, and rocky points where the displaced bait stacks

Next on this water

June mayfly hatch (walleye lakes) · mayflyJun 1 – Aug 10 · in ~9 months

Recommendations come from depth structure and seasonal species behavior. Treat them as a starting point, not a guarantee. Contours on this water are approximations. Never use for navigation. Always check local regulations.

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Recent catches at Marl Lake

Shared by DepthScout anglers. Exact spots stay private, always.

No shared catches here yet — be the first.Log a catch from the map above and share it to put Marl Lake on the board.

Fishing Marl Lake: what the data says

266-acre lake in Sudbury District, Ontario. The lake tops out around 41 ft. Bathymetry on this water is estimated from its real outline and maximum depth. Use it to shortlist water, then verify with your electronics — and never navigate by it. Below is the species-by-species picture, pulled from the same data the map uses.

Marl Lake maps at 266 acres behind 6.1 miles of shoreline, with a single island in the mix. With a shoreline index of 2.7, this water is all arms and coves — edge habitat well beyond its acreage. Roughly 68% of the water is 15 ft or less as modeled, the band where the food chain lives. The basin spans about 1.1 mi end to end and 0.8 mi across at its widest. It sits in Sudbury District. If the bite dies, Camp 18 L. is 1 mi to the south.

Northern Pike fishing at Marl Lake

When the water first warms, northern pike slide up into 2 to 8 ft. Summer is an 8 to 20 ft game here, winter a 5 to 15 ft one. Start at Shallow bay flat. It's a weed flat holding about 5 ft of water and rates prime come spring. The feeding windows run early morning and the evening. Keep a bucktail or a weedless spoon over cabbage rigged through the warm months.

Season	Depth	Best window	Start at	Go-to baits
Spring	2 to 8 ft	midday & dawn	Shallow bay flat (5 ft)	#5 inline spinner, Spoon (red/white)
Summer	8 to 20 ft	dawn & dusk	Break off the point (18 ft)	Bucktail, Weedless spoon over cabbage
Fall	6 to 18 ft	midday & dawn	Break off the point (18 ft)	Big rubber (Bull Dawg style), Husky-style jerkbait
Winter	5 to 15 ft	midday	Shallow bay flat (5 ft)	Tip-ups, Large jigging spoon

Notable structure

Count 6 structure marks on this chart. The deepest, Deep basin, sits near 35 ft.

Deep basin: deep basin, around 35 ft
Break off the point: drop-off, around 18 ft
Main-lake point: point, around 10 ft
Secondary point: point, around 10 ft
Shallow bay flat: weed flat, around 5 ft
Back-bay flat: weed flat, around 5 ft

Marl Lake fishing regulations

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 Marl Lake specifically, so confirm the current rules before you fish.

Check the official Ontario fishing regulations →

Common questions

How deep is Marl Lake?

Marl Lake is about 41 ft (12 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.

What fish are in Marl Lake?

Anglers target northern pike on Marl Lake.

Where is the best fishing spot on Marl Lake?

Shallow bay flat is the top-rated area: a weed flat in about 5 ft of water that rates prime for northern pike in spring. Open the map above to see every rated spot for each species and season.

When is the best time to fish Marl Lake?

For northern pike, the summer bite is best in early morning 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.

What are the fishing regulations for Marl Lake?

Fishing on Marl 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.

Nearby waters

Camp 18 L. 1 mi · Harry Lake 1 mi · Gravelridge Lake 3 mi · Marta Lake 3 mi · Whigham Lake 3 mi · Whigham Lake 41 4 mi · Norfolk Lake 5 mi · Westmeath Lake 5 mi · Stangiff Lake 6 mi · Ivanhoe L. 53 6 mi · Ivanhoe L. 52 6 mi · Gullystone Lake 6 mi

See how Marl Lake stacks up: best northern pike lakes in Ontario

More water nearby: Sudbury District fishing maps (868 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.