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Shared by DepthScout anglers. Exact spots stay private, always.
795-acre lake in Bruce County, Ontario. The lake tops out around 5 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.
On the chart, Isaac Lake draws 801 acres inside 13.6 miles of shoreline, with 3 islands in the mix. The 3.4 development index tells the story — a convoluted bank whose fishable edge far outruns the acreage. All of it is shallow-zone water — under ~15 ft across the entire basin, so the food chain has the run of the place. The basin spans about 2.9 mi end to end and 1.3 mi across at its widest. You'll find it in Bruce County. The nearest mapped water is Hodgins Lake, 1 mi to the west.
When the water first warms, walleye slide up into 1 to 5 ft. There's no big seasonal slide here — summer means 2 to 5 ft, winter 2 to 5 ft. If you only fish one area, make it Break off the point: a drop-off around 2 ft that scores prime in fall. In summer the feeding windows fall in 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 | 1 to 5 ft | dusk & dawn | Main-lake point (5 ft) | 1/8 oz jig + minnow, Hair jig |
| Summer | 2 to 5 ft | dusk & dawn | Break off the point (2 ft) | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 2 to 5 ft | dusk & night | Break off the point (2 ft) | Jigging rap, Jig + big minnow |
| Winter | 2 to 5 ft | dusk & dawn | Deep basin (4 ft) | Jigging spoon + minnow head, Rattle bait |
When the water first warms, yellow perch slide up into 1 to 5 ft. There's no big seasonal slide here — summer means 2 to 5 ft, winter 2 to 5 ft. Start at Shallow bay flat. It's a weed flat holding about 3 ft of water and rates prime come spring. The feeding windows run 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 | 1 to 5 ft | midday & dawn | Shallow bay flat (3 ft) | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 2 to 5 ft | dawn | Deep basin (4 ft) | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 2 to 5 ft | midday | Deep basin (4 ft) | Jigging spoon (small), Perch rig / spreader |
| Winter | 2 to 5 ft | midday & dawn | Deep basin (4 ft) | Tungsten jig + spikes, Rattle spoon (small) |
The spring pattern is a shallow one: northern pike in 1 to 5 ft. The depth story barely changes: 2 to 5 ft through summer, 2 to 5 ft in winter. The spot to know is Shallow bay flat, a weed flat in about 3 ft of water that rates prime for northern pike in spring. Plan around early morning and the evening in the warm months. Summer baits: a bucktail or a weedless spoon over cabbage gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 5 ft | midday & dawn | Shallow bay flat (3 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 2 to 5 ft | dawn & dusk | Shallow bay flat (3 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 2 to 5 ft | midday & dawn | Shallow bay flat (3 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 2 to 5 ft | midday | Shallow bay flat (3 ft) | Tip-ups, Large jigging spoon |
The spring pattern is a shallow one: smallmouth bass in 1 to 5 ft. The depth story barely changes: 2 to 5 ft through summer, 2 to 5 ft in winter. The spot to know is Main-lake point, a point in about 5 ft of water that rates prime for smallmouth bass in fall. Plan around early morning and the evening in the warm months. Summer baits: a drop shot (goby/minnow) or a ned rig gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 5 ft | dawn & dusk | Main-lake point (5 ft) | Ned rig, Tube jig |
| Summer | 2 to 5 ft | dawn & dusk | Break off the point (2 ft) | Drop shot (goby/minnow), Ned rig |
| Fall | 2 to 5 ft | midday & dawn | Main-lake point (5 ft) | Jerkbait, Blade bait |
| Winter | 2 to 5 ft | midday | Break off the point (2 ft) | Blade bait, Hair jig |
Start shallow in spring: largemouth bass sit in 1 to 5 ft that time of year. They don't go far with the seasons — 2 to 5 ft covers summer, 2 to 5 ft covers winter. Top water on the chart: Shallow bay flat, a weed flat in the 3 ft range, prime in spring. Fish it in early morning and the evening and you'll meet the bite. Throw a texas-rigged 10" worm or a deep-diving crankbait until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 5 ft | dawn & dusk | Shallow bay flat (3 ft) | Spinnerbait, Chatterbait |
| Summer | 2 to 5 ft | dawn & dusk | Shallow bay flat (3 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 1 to 5 ft | midday & dawn | Main-lake point (5 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 2 to 5 ft | midday | Break off the point (2 ft) | Blade bait, Jigging spoon |
Spring rock bass on Isaac Lake hold shallow, usually 1 to 5 ft. Depth-wise the year is flat: 1 to 5 ft in summer, 2 to 5 ft once it turns cold. Put Main-lake point first on the milk run — a point near 5 ft that grades prime for summer. The feeding windows run 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 | 1 to 5 ft | midday & dawn | Main-lake point (5 ft) | 1/16 oz jig + grub, Small inline spinner |
| Summer | 1 to 5 ft | dusk | Main-lake point (5 ft) | Ned rig (small), Marabou jig |
| Fall | 2 to 5 ft | midday | Break off the point (2 ft) | Small tube jig, Inline spinner |
| Winter | 2 to 5 ft | midday | Deep basin (4 ft) | Tungsten jig + plastic, Small spoon + spike |
Isaac Lake also holds pumpkinseed (1 to 5 ft in summer), brown bullhead (1 to 5 ft in summer), common carp (1 to 5 ft in summer). Pick any of them on the map above for rated spots and bait picks.
The chart marks 6 structure features on Isaac Lake; the deepest is Main-lake point at about 5 ft.
Access data: Geospatial Ontario - Fishing Access Points. Confirm conditions and fees locally before you launch.
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 Isaac Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Isaac Lake is about 5 ft (2 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.
Anglers target walleye, yellow perch, northern pike, smallmouth bass, largemouth bass, rock bass, pumpkinseed, brown bullhead, common carp on Isaac Lake.
Break off the point is the top-rated area: a drop-off in about 2 ft of water that rates prime for walleye in fall. Every other rated spot, per species and season, is on the map above.
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.
Fishing on Isaac 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.
Hodgins Lake 1 mi · North Hodgins Lake 2 mi · Amabel L. 3 2 mi · Patterson Lake 2 mi · Spry Lake 2 mi · Sky Lake 2 mi · Boat Lake 3 mi · Berford Lake 3 mi · Beattie Lake 4 mi · Johns L. 5 mi · Shepherd Lake 10 mi · Gleason Lake 10 mi
See how Isaac Lake stacks up: best largemouth bass lakes in Ontario · best smallmouth bass lakes in Ontario · best walleye lakes in Ontario · best northern pike lakes in Ontario
More water nearby: Bruce County fishing maps (60 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.