Tyrrell L. 21 Depth Map & Fishing Spots (ON)

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Lake depth chart

Tyrrell L. 21, ON

Max 56 ft

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Where to start

Hopper & ant season (windward banks) window is on — see the hatch outlook

Hatch outlook

Hopper & ant season (windward banks)Active window

Typical here: Jul 1 – Sep 15 · hoppers peak July–August; winged-ant falls show up on warm humid afternoons — a wind event, not a hatch

adultwarm, breezy afternoons, roughly 1–5pm — slap the imitation down hard — the splat is the trigger — then wait; count to three after the rise before setting

Work the windward bank on breezy summer afternoons — that's where the food is. Casting-bubble-and-hopper is the direct translation; otherwise run small topwaters and inline spinners tight along the grass edges and blowdown banks in the afternoon warmth.

The event happens over windward grassy banks, overhanging brush and blowdowns — wherever the breeze dumps the bugs

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

Spring bug season (brook trout lakes) · forageApr 25 – Jun 30 · in ~8 months

Hex (giant mayfly) · mayflyMay 25 – Aug 10 · in ~9 months

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 Tyrrell L. 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 Tyrrell L. 21 on the board.

Fishing Tyrrell L. 21: what the data says

15-acre lake in Timiskaming District, Ontario. The lake tops out around 56 ft. The depth picture is modeled, anchored to the true shoreline and the water's published max depth — a scouting aid, never a chart to run a boat by. Here is how the season plays out for each species, straight from the data behind the map.

Drawn out, this is 14 acres of water rimmed by 0.6 miles of bank. Its 1.2 shoreline index means few bank features; the contours below do the pattern work. Roughly 21% of the water is 15 ft or less as modeled, the band where the food chain lives. The water lies in Timiskaming District. Closest neighbour on DepthScout: Tyrrell L. 47, 0 mi north of here.

Brook Trout fishing at Tyrrell L. 21

The spring pattern is a shallow one: brook trout in 2 to 15 ft. Midsummer fish sit out in 10 to 30 ft before dropping to 3 to 20 ft for winter. The spot to know is Break off the point, a drop-off in about 25 ft of water that rates prime for brook trout in summer. Plan around early morning and the evening in the warm months. Summer baits: a small spoon fished deep or a trolled lake-clear wobbler + worm gets it done.

Season	Depth	Best window	Start at	Go-to baits
Spring	2 to 15 ft	dawn & dusk	Main-lake point (14 ft)	Small inline spinner (gold), Tiny spoon
Summer	10 to 30 ft	dawn & dusk	Break off the point (25 ft)	Small spoon fished deep, Trolled lake-clear wobbler + worm
Fall	2 to 15 ft	midday & dawn	Main-lake point (14 ft)	Small spoon (orange), Spinner
Winter	3 to 20 ft	dawn	Break off the point (25 ft)	Small jigging spoon, Tungsten jig + plastic

Yellow Perch fishing at Tyrrell L. 21

Early season yellow perch use the shallows, holding in 3 to 12 ft. Expect a summer slide to 10 to 30 ft, then a winter hold in 15 to 35 ft. Put Break off the point first on the milk run — a drop-off near 25 ft that grades prime for summer. In summer the feeding windows fall in early morning. Tie on a drop-shot micro plastics or a small spoon tipped with worm and you're in the game.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 12 ft	midday & dawn	open water	Small jig + curly tail, Perch-pattern micro crank
Summer	10 to 30 ft	dawn	Break off the point (25 ft)	Drop-shot micro plastics, Small spoon tipped with worm
Fall	12 to 35 ft	midday	Break off the point (25 ft)	Jigging spoon (small), Perch rig / spreader
Winter	15 to 35 ft	midday & dawn	Break off the point (25 ft)	Tungsten jig + spikes, Rattle spoon (small)

Notable structure

Tyrrell L. 21 carries 3 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 48 ft down.

Deep basin: deep basin, around 48 ft
Break off the point: drop-off, around 25 ft
Main-lake point: point, around 14 ft

Tyrrell L. 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 Tyrrell L. 21 specifically, so confirm the current rules before you fish.

Check the official Ontario fishing regulations →

Common questions

How deep is Tyrrell L. 21?

Tyrrell L. 21 is about 56 ft (17 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 Tyrrell L. 21?

Anglers target brook trout, yellow perch on Tyrrell L. 21.

Where is the best fishing spot on Tyrrell L. 21?

Break off the point is the top-rated area: a drop-off in about 25 ft of water that rates prime for yellow perch in summer. The interactive chart above rates every spot for each species and season.

When is the best time to fish Tyrrell L. 21?

For brook trout, 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 Tyrrell L. 21?

Fishing on Tyrrell L. 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

Tyrrell L. 47 0 mi · Mosher Lake 1 mi · Boot Lake 1 mi · Owl Lake 1 mi · Slim Lake 3 mi · Fisher Lake 4 mi · Porphyry Lake 4 mi · Metikemedo L. 4 mi · Margueratt Lake 4 mi · Milly L. 5 mi · North Gamble Lake 5 mi · Logan Lake 5 mi

See how Tyrrell L. 21 stacks up: best yellow perch lakes in Ontario · best brook trout lakes in Ontario

More water nearby: Timiskaming District fishing maps (515 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.