Thirty Lake Depth Map & Fishing Spots (ON)

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Lake depth chart

Thirty Lake, ON

Max 35 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

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 Thirty 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 Thirty Lake on the board.

Fishing Thirty Lake: what the data says

51-acre lake in Parry Sound District, Ontario. The lake tops out around 35 ft. The contours are modeled from the water's real shoreline and maximum depth. Treat them as a rough guide, and never use them for navigation. What the data behind the map says about each species, season by season:

The drawn water covers 50 acres wrapped in 1.9 miles of bank. With a 1.9 development index there's bank structure worth casting at, in moderation. Roughly 77% of the water is 15 ft or less as modeled, the band where the food chain lives. Tip to tip the water measures near 0.6 mi with a 0.3-mi widest point. It sits in Parry Sound District. If the bite dies, Little Hungry Lake is 0 mi to the northeast.

Yellow Perch fishing at Thirty Lake

Start shallow in spring: yellow perch sit in 3 to 12 ft that time of year. Warm water sends them out to 10 to 30 ft; cold water stacks them in 15 to 35 ft. Top water on the chart: Shallow bay flat, a weed flat in the 4 ft range, prime in spring. Fish it in early morning and you'll meet the bite. Throw a drop-shot micro plastics or a small spoon tipped with worm until the fish tell you otherwise.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 12 ft	midday & dawn	Shallow bay flat (4 ft)	Small jig + curly tail, Perch-pattern micro crank
Summer	10 to 30 ft	dawn	Deep basin (30 ft)	Drop-shot micro plastics, Small spoon tipped with worm
Fall	12 to 35 ft	midday	Deep basin (30 ft)	Jigging spoon (small), Perch rig / spreader
Winter	15 to 35 ft	midday & dawn	Deep basin (30 ft)	Tungsten jig + spikes, Rattle spoon (small)

Pumpkinseed fishing at Thirty Lake

The spring pattern is a shallow one: pumpkinseed in 1 to 8 ft. As the season builds they drop to 2 to 10 ft, wintering in 6 to 18 ft. Top water on the chart: Shallow bay flat, a weed flat in the 4 ft range, prime in spring. Time it for the evening and early morning. Summer baits: a micro tube or a sponge spider (fly) gets it done.

Season	Depth	Best window	Start at	Go-to baits
Spring	1 to 8 ft	midday & dusk	Shallow bay flat (4 ft)	Micro jig under a float, Tiny beetle-spin
Summer	2 to 10 ft	dusk & dawn	Shallow bay flat (4 ft)	Micro tube, Sponge spider (fly)
Fall	4 to 14 ft	dusk & dawn	Shallow bay flat (4 ft)	Micro jig + waxworm, Small spoon tipped
Winter	6 to 18 ft	dawn	Shallow bay flat (4 ft)	Tungsten ice jig + plastic, Tiny spoon

Notable structure

6 pieces of structure are mapped here — Deep basin, around 30 ft, is the deepest of them.

Deep basin: deep basin, around 30 ft
Break off the point: drop-off, around 16 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

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

Check the official Ontario fishing regulations →

Common questions

How deep is Thirty Lake?

Thirty Lake is about 35 ft (11 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 Thirty Lake?

Anglers target yellow perch, pumpkinseed on Thirty Lake.

Where is the best fishing spot on Thirty Lake?

Shallow bay flat is the top-rated area: a weed flat in about 4 ft of water that rates prime for yellow perch in spring. The map above holds the full rated-spot list for every species and season.

When is the best time to fish Thirty Lake?

For yellow perch, the summer bite is best in 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 Thirty Lake?

Fishing on Thirty 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

Little Hungry Lake 0 mi · Hungry Lake 1 mi · Morgan's Lake 1 mi · Dump Lake 2 mi · Greenish Lake 2 mi · Cripple Lake 3 mi · Hart Lake 3 mi · Willie Lake 3 mi · Little Bear L. 3 mi · Fox Lake 3 mi · North Dotty Lake 4 mi · Dunstan Lake 4 mi

See how Thirty Lake stacks up: best yellow perch lakes in Ontario · best pumpkinseed lakes in Ontario

More water nearby: Parry Sound District fishing maps (441 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.