Grenadier Lake Depth Map & Fishing Spots (ON)

Skip to interactive depth chart

Lake depth chart

Grenadier Lake, ON

Max 34 ft

Today's read

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.

Loading depth chart…

Recent catches at Grenadier 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 Grenadier Lake on the board.

Fishing Grenadier Lake: what the data says

430-acre lake in Sudbury District, Ontario. The lake tops out around 34 ft. The contours come from a model of the real basin shape and its known max depth. Read them as probabilities, not soundings, and keep them out of navigation decisions. What the data behind the map says about each species, season by season:

Drawn out, this is 433 acres of water rimmed by 9.3 miles of bank — 2 islands included. The 3.2 development index tells the story — a convoluted bank whose fishable edge far outruns the acreage. Roughly 67% of the water is 15 ft or less as modeled, the band where the food chain lives. Call it 2.3 mi long by 0.8 mi wide at the broadest reach. The water lies in Sudbury District. The nearest mapped water is British Lake, 1 mi to the east.

Northern Pike fishing at Grenadier Lake

In spring, northern pike run shallow here, mostly 2 to 8 ft. Summer pushes them deeper, 8 to 20 ft, and winter fish settle into 5 to 15 ft. Shallow bay flat is the standout, a weed flat at roughly 4 ft, rated prime for spring northern pike. Time it for early morning and the evening. You won't need more than a bucktail or a weedless spoon over cabbage most summer days.

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 (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	Shallow bay flat (4 ft)	Tip-ups, Large jigging spoon

Notable structure

6 pieces of structure are mapped here — Deep basin, around 29 ft, is the deepest of them.

Deep basin: deep basin, around 29 ft
Break off the point: drop-off, around 15 ft
Main-lake point: point, around 9 ft
Secondary point: point, around 9 ft
Shallow bay flat: weed flat, around 4 ft
Back-bay flat: weed flat, around 4 ft

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

Check the official Ontario fishing regulations →

Common questions

How deep is Grenadier Lake?

Grenadier Lake is about 34 ft (10 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 Grenadier Lake?

Anglers target northern pike on Grenadier Lake.

Where is the best fishing spot on Grenadier Lake?

Shallow bay flat is the top-rated area: a weed flat in about 4 ft of water that rates prime for northern pike in spring. Every other rated spot, per species and season, is on the map above.

When is the best time to fish Grenadier 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 Grenadier Lake?

Fishing on Grenadier 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

British Lake 1 mi · Stone Lake 3 mi · Crazy Lake 3 mi · Cooke Lake 3 mi · Burton Lake 5 mi · Admiral L. 075533 6 mi · Stump Lake 6 mi · Clifton Lake 6 mi · Wye L. 7 mi · Little Missinaibi Lake 7 mi · Lipsett L. 2 8 mi · Lipsett Lake 8 mi

See how Grenadier 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.