Lake 10N-21 Depth Map & Fishing Spots (ON)

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Lake depth chart

Lake 10N-21, ON

Max 33 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 here are generated from real agency depth surveys; use the survey badge for the provider, dataset, datum and measured coverage. Never use for navigation. Always check local regulations.

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Recent catches at Lake 10N-21

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 Lake 10N-21 on the board.

Fishing Lake 10N-21: what the data says

22-acre lake in Cochrane District, Ontario. The lake tops out around 33 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 a transect sounding survey by the Ontario MNRF. The season-by-season read for each species follows, from the map's own numbers.

On the chart, Lake 10N-21 draws 22 acres inside 1.2 miles of shoreline. Index 1.9 on the shoreline: a few honest points and pockets, nothing labyrinthine. About 72% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. Figure 0.5 mi of water from one end to the other. You'll find it in Cochrane District. For a second option, Lake 10N-19 lies 0 mi northeast.

Northern Pike fishing at Lake 10N-21

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. Shallow bay flat is the standout, a weed flat at roughly 2 ft, rated prime for spring 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 (2 ft)	#5 inline spinner, Spoon (red/white)
Summer	8 to 20 ft	dawn & dusk	Back-bay flat (7 ft)	Bucktail, Weedless spoon over cabbage
Fall	6 to 18 ft	midday & dawn	Back-bay flat (7 ft)	Big rubber (Bull Dawg style), Husky-style jerkbait
Winter	5 to 15 ft	midday	Back-bay flat (7 ft)	Tip-ups, Large jigging spoon

Notable structure

The chart marks 5 structure features on Lake 10N-21; the deepest is Deep basin at about 31 ft.

Deep basin: deep basin, around 31 ft
Break off the point: drop-off, around 20 ft
Main-lake point: point, around 8 ft
Back-bay flat: weed flat, around 7 ft
Shallow bay flat: weed flat, around 2 ft

Lake 10N-21 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 Lake 10N-21 specifically, so confirm the current rules before you fish.

Check the official Ontario fishing regulations →

Common questions

How deep is Lake 10N-21?

Lake 10N-21 is about 33 ft (10 m) deep at its deepest point. The depth data here comes from a transect sounding survey by the Ontario MNRF.

What fish are in Lake 10N-21?

Anglers target northern pike on Lake 10N-21.

Where is the best fishing spot on Lake 10N-21?

Shallow bay flat is the top-rated area: a weed flat in about 2 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 Lake 10N-21?

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 Lake 10N-21?

Fishing on Lake 10N-21 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

Lake 10N-19 0 mi · Lake 10N-17 1 mi · Eastford Lake 5 mi · Ford Lake 5 mi · Milligan Lake 8 mi · Munro Lake 11 mi · Blueberry Lake 12 mi · Monahan Lake 12 mi · Flipper L. 12 mi · Fade Lake 13 mi · Packsack L. 13 mi · Keller Lake 14 mi

See how Lake 10N-21 stacks up: best northern pike lakes in Ontario

More water nearby: Cochrane District fishing maps (673 charts). Browse all Ontario fishing maps or 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.