Jeffers Lake Depth Map & Fishing Spots (ON)

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Lake depth chart

Jeffers Lake, ON

Max 39 ft

Today's read

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

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 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 Jeffers 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 Jeffers Lake on the board.

Fishing Jeffers Lake: what the data says

9-acre lake in Renfrew County, Ontario. The lake tops out around 39 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 the Ontario MNRF survey of 1978, a decades-old survey (an MNRF lake survey). What follows comes from the same scoring engine that paints the spots above.

On the chart, Jeffers Lake draws 9 acres inside 0.5 miles of shoreline. Its 1.2 shoreline index means few bank features; the contours below do the pattern work. About 69% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. The water lies in Renfrew County. For a second option, Strains Lake lies 1 mi southwest.

Rainbow Trout fishing at Jeffers Lake

The spring pattern is a shallow one: rainbow trout in 5 to 20 ft. Midsummer fish sit out in 8 to 30 ft before dropping to 8 to 39 ft for winter. The spot to know is Shoreline break, a drop-off in about 32 ft of water that rates prime for rainbow trout in winter. Plan around early morning and the evening in the warm months. Summer baits: a dodger + spoon (deep troll) or a flutter spoon gets it done.

Season	Depth	Best window	Start at	Go-to baits
Spring	5 to 20 ft	dawn & dusk	Shallow bay flat (1 ft)	Inline spinner (silver), Small spoon
Summer	8 to 30 ft	dawn & dusk	Shoreline break (32 ft)	Dodger + spoon (deep troll), Flutter spoon
Fall	10 to 35 ft	dawn & dusk	Shoreline break (32 ft)	Casting spoon, Jerkbait over shoals
Winter	8 to 39 ft	dawn	Shoreline break (32 ft)	Jigging spoon, Tube jig (white)

Smallmouth Bass fishing at Jeffers Lake

Spring puts smallmouth bass in skinny water — 3 to 12 ft is the zone. As the season builds they drop to 10 to 30 ft, wintering in 12 to 39 ft. Winter smallmouth bass concentrate at Shoreline break, a prime-rated drop-off around 32 ft. Warm-month bites cluster around early morning and the evening. A drop shot (goby/minnow) or a ned rig covers the summer program.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 12 ft	dawn & dusk	open water	Ned rig, Tube jig
Summer	10 to 30 ft	dawn & dusk	Shoreline break (32 ft)	Drop shot (goby/minnow), Ned rig
Fall	8 to 25 ft	midday & dawn	Shoreline break (32 ft)	Jerkbait, Blade bait
Winter	12 to 39 ft	midday	Shoreline break (32 ft)	Blade bait, Hair jig

Notable structure

Jeffers Lake carries 4 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 39 ft down.

Deep basin: deep basin, around 39 ft
Shoreline break: drop-off, around 32 ft
Shallow bay flat: weed flat, around 1 ft
Back-bay flat: weed flat, around 1 ft

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

Check the official Ontario fishing regulations →

Common questions

How deep is Jeffers Lake?

Jeffers Lake is about 39 ft (12 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1978, a decades-old survey (an MNRF lake survey).

What fish are in Jeffers Lake?

Anglers target rainbow trout, smallmouth bass on Jeffers Lake.

Where is the best fishing spot on Jeffers Lake?

Shoreline break is the top-rated area: a drop-off in about 32 ft of water that rates prime for smallmouth bass in winter. Scroll up to the map for the complete spot list by species and season.

When is the best time to fish Jeffers Lake?

For rainbow 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 Jeffers Lake?

Fishing on Jeffers 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

Strains Lake 1 mi · Lower Twin Lake 2 mi · Upper Twin Lake 2 mi · Burns Lake 2 mi · Dicks Lake 2 mi · Burns Long Lake 3 mi · Haley Lake 4 mi · Tooeys Lake 4 mi · McCool Lake 4 mi · Crutch Lake 4 mi · Hardwood Lake 4 mi · Joes Lake 4 mi

See how Jeffers Lake stacks up: best smallmouth bass lakes in Ontario · best rainbow trout lakes in Ontario

More water nearby: Renfrew County fishing maps (298 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.