Third Depot L. Depth Map & Fishing Spots (ON)

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Lake depth chart

Third Depot L., ON

Max 48 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

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.

Depth · ft

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Recent catches at Third Depot L.

Recent public catches load as you reach this section.

Fishing Third Depot L.: what the data says

279-acre lake in Frontenac County, Ontario. The lake tops out around 48 ft. What you see is a modeled chart: the shoreline is real, the max depth is published, and the contours between are estimated. Plan with it; don't navigate by it. What the data behind the map says about each species, season by season:

On the chart, Third Depot L. draws 283 acres inside 8.9 miles of shoreline, broken up by 3 islands. An index of 3.8 puts the bank firmly in maze territory: point after pocket after cove, every one a casting target. The shallow band under 15 ft claims about 60% of the surface on the model — that's where the groceries are. Tip to tip the water measures near 1.4 mi with a 0.9-mi widest point. The water lies in Frontenac County. For a second option, Loon Lake lies 1 mi northwest.

Walleye fishing at Third Depot L.

When the water first warms, walleye slide up into 4 to 15 ft. Summer is a 15 to 35 ft game here, winter a 20 to 40 ft one. Start at Break off the point. It's a drop-off holding about 22 ft of water and rates prime come fall. The feeding windows run the evening and early morning. Keep a crawler harness on bottom bouncer or a deep crankbait (trolled) rigged through the warm months.

Season	Depth	Best window	Start at	Go-to baits
Spring	4 to 15 ft	dusk & dawn	Main-lake point (12 ft)	1/8 oz jig + minnow, Hair jig
Summer	15 to 35 ft	dusk & dawn	Break off the point (22 ft)	Crawler harness on bottom bouncer, Deep crankbait (trolled)
Fall	12 to 40 ft	dusk & night	Break off the point (22 ft)	Jigging rap, Jig + big minnow
Winter	20 to 40 ft	dusk & dawn	Deep basin (41 ft)	Jigging spoon + minnow head, Rattle bait

Yellow Perch fishing at Third Depot L.

When the water first warms, yellow perch slide up into 3 to 12 ft. By summer they slide out to 10 to 30 ft, and by winter most fish are in 15 to 35 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 6 ft that scores prime in spring. In summer the feeding windows fall in early morning. Keep a drop-shot micro plastics or a small spoon tipped with worm rigged through the warm months.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 12 ft	midday & dawn	Shallow bay flat (6 ft)	Small jig + curly tail, Perch-pattern micro crank
Summer	10 to 30 ft	dawn	Break off the point (22 ft)	Drop-shot micro plastics, Small spoon tipped with worm
Fall	12 to 35 ft	midday	Break off the point (22 ft)	Jigging spoon (small), Perch rig / spreader
Winter	15 to 35 ft	midday & dawn	Deep basin (41 ft)	Tungsten jig + spikes, Rattle spoon (small)

Northern Pike fishing at Third Depot L.

The spring pattern is a shallow one: northern pike in 2 to 8 ft. As the season builds they drop to 8 to 20 ft, wintering in 5 to 15 ft. Top water on the chart: Shallow bay flat, a weed flat in the 6 ft range, prime in spring. Time it for early morning and the evening. Summer baits: a bucktail or a weedless spoon over cabbage gets it done.

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

Rock Bass fishing at Third Depot L.

Spring rock bass on Third Depot L. hold shallow, usually 2 to 10 ft. By summer they slide out to 5 to 20 ft, and by winter most fish are in 12 to 30 ft. The chart's best answer is Main-lake point — point, 12 ft, prime for summer. Prime time lands in the evening. The summer box starts with a ned rig (small) or a marabou jig.

Season	Depth	Best window	Start at	Go-to baits
Spring	2 to 10 ft	midday & dawn	Main-lake point (12 ft)	1/16 oz jig + grub, Small inline spinner
Summer	5 to 20 ft	dusk	Main-lake point (12 ft)	Ned rig (small), Marabou jig
Fall	8 to 22 ft	midday	Break off the point (22 ft)	Small tube jig, Inline spinner
Winter	12 to 30 ft	midday	Break off the point (22 ft)	Tungsten jig + plastic, Small spoon + spike

Crappie fishing at Third Depot L.

The spring pattern is a shallow one: crappie in 2 to 8 ft. As the season builds they drop to 10 to 25 ft, wintering in 15 to 35 ft. Top water on the chart: Shallow bay flat, a weed flat in the 6 ft range, prime in spring. Time it for early morning and the evening. Summer baits: a jig trolled/spider-rigged or a small crankbait (trolled) gets it done.

Season	Depth	Best window	Start at	Go-to baits
Spring	2 to 8 ft	midday & dawn	Shallow bay flat (6 ft)	1/16 oz jig + tube, Curly-tail grub
Summer	10 to 25 ft	dawn & dusk	Break off the point (22 ft)	Jig trolled/spider-rigged, Small crankbait (trolled)
Fall	8 to 20 ft	dawn	Shallow bay flat (6 ft)	Jig + minnow combo, Small swimbait (1.5-2")
Winter	15 to 35 ft	midday	Deep basin (41 ft)	Tungsten jig + soft plastic, Tiny jigging spoon

Bluegill fishing at Third Depot L.

Spring puts bluegill in skinny water — 1 to 6 ft is the zone. As the season builds they drop to 4 to 15 ft, wintering in 10 to 25 ft. Spring bluegill concentrate at Shallow bay flat, a prime-rated weed flat around 6 ft. Warm-month bites cluster around early morning and the evening. A small sponge spider (fly) or a micro tube jig covers the summer program.

Season	Depth	Best window	Start at	Go-to baits
Spring	1 to 6 ft	midday & dusk	Shallow bay flat (6 ft)	1/32 oz jig + micro plastic, Tiny popper (evenings)
Summer	4 to 15 ft	dawn & dusk	Shallow bay flat (6 ft)	Small sponge spider (fly), Micro tube jig
Fall	6 to 18 ft	midday	Shallow bay flat (6 ft)	Micro jig + waxworm, Small spoon tipped
Winter	10 to 25 ft	midday	Break off the point (22 ft)	Tungsten ice jig + plastic, Tiny spoon

Third Depot L. also holds pumpkinseed (2 to 10 ft in summer), brown bullhead (3 to 12 ft in summer), burbot (14 to 48 ft in summer). Pick any of them on the map above for rated spots and bait picks.

Notable structure

The chart marks 6 structure features on Third Depot L.; the deepest is Deep basin at about 41 ft.

Deep basin: deep basin, around 41 ft
Break off the point: drop-off, around 22 ft
Main-lake point: point, around 12 ft
Secondary point: point, around 12 ft
Shallow bay flat: weed flat, around 6 ft
Back-bay flat: weed flat, around 6 ft

Third Depot L. 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 Third Depot L. specifically, so confirm the current rules before you fish.

Check the official Ontario fishing regulations →

Common questions

How deep is Third Depot L.?

Third Depot L. is about 48 ft (15 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 Third Depot L.?

Anglers target walleye, yellow perch, northern pike, rock bass, crappie, bluegill, pumpkinseed, brown bullhead, burbot on Third Depot L..

Where is the best fishing spot on Third Depot L.?

Break off the point is the top-rated area: a drop-off in about 22 ft of water that rates prime for walleye in fall. Scroll up to the map for the complete spot list by species and season.

When is the best time to fish Third Depot L.?

For walleye, the summer bite is best in the evening and early morning. 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 Third Depot L.?

Fishing on Third Depot L. 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

Loon Lake 1 mi · Fourth Deposit Lake 2 mi · Second Depot Lake 2 mi · Chippego Lake 2 mi · Fifth Depot Lake 5 mi · First Depot L. 5 mi · Cole Lake 5 mi · Elbow Lake 5 mi · St. Andrews Lake 6 mi · Sixth Depot Lake 6 mi · Vanluven Lake 7 mi · Howes Lake 7 mi

See how Third Depot L. stacks up: best walleye lakes in Ontario · best northern pike lakes in Ontario · best crappie lakes in Ontario · best bluegill lakes in Ontario

More water nearby: Frontenac County fishing maps (127 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.