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Fishing Flatt Lake: what the data says
284-acre lake near Ontario. The lake tops out around 10 ft. The depth chart is built from real state fisheries GPS surveys, so the humps, channels and drop-offs you see are measured, not guessed. Here is how the season plays out for each species, straight from the data behind the map.
Walleye fishing at Flatt Lake
In spring, walleye run shallow here, mostly 3 to 10 ft. Summer fish stay in 3 to 10 ft, and winter fish hold in 3 to 10 ft. Break off the point is the standout, a drop-off at roughly 9 ft, rated prime for fall walleye. In summer the feeding windows fall in the evening and early morning. A crawler harness on bottom bouncer or a deep crankbait (trolled) covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 10 ft | dusk & dawn | 1/8 oz jig + minnow, Hair jig |
| Summer | 3 to 10 ft | dusk & dawn | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 3 to 10 ft | dusk & night | Jigging rap, Jig + big minnow |
| Winter | 3 to 10 ft | dusk & dawn | Jigging spoon + minnow head, Rattle bait |
Northern Pike fishing at Flatt Lake
In spring, northern pike run shallow here, mostly 2 to 8 ft. They move out to 3 to 10 ft in summer and finish the year down in 3 to 10 ft. 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. In summer the feeding windows fall in early morning and the evening. Tie on a bucktail or a weedless spoon over cabbage and you're in the game.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | #5 inline spinner, Spoon (red/white) |
| Summer | 3 to 10 ft | dawn & dusk | Bucktail, Weedless spoon over cabbage |
| Fall | 3 to 10 ft | midday & dawn | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 3 to 10 ft | midday | Tip-ups, Large jigging spoon |
Yellow Perch fishing at Flatt Lake
Start shallow in spring: yellow perch sit in 3 to 10 ft that time of year. Summer fish stay in 3 to 10 ft, and winter fish hold in 3 to 10 ft. The spot to know is Shallow bay flat, a weed flat in about 3 ft of water that rates prime for yellow perch in spring. 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 | Go-to baits |
|---|---|---|---|
| Spring | 3 to 10 ft | midday & dawn | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 3 to 10 ft | dawn | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 3 to 10 ft | midday | Jigging spoon (small), Perch rig / spreader |
| Winter | 3 to 10 ft | midday & dawn | Tungsten jig + spikes, Rattle spoon (small) |
Smallmouth Bass fishing at Flatt Lake
Spring smallmouth bass on Flatt Lake hold shallow, usually 3 to 10 ft. Summer fish stay in 3 to 10 ft, and winter fish hold in 3 to 10 ft. If you only fish one area, make it Main-lake point: a point around 4 ft that scores prime in fall. Plan around early morning and the evening in the warm months. A drop shot (goby/minnow) or a ned rig covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 10 ft | dawn & dusk | Ned rig, Tube jig |
| Summer | 3 to 10 ft | dawn & dusk | Drop shot (goby/minnow), Ned rig |
| Fall | 3 to 10 ft | midday & dawn | Jerkbait, Blade bait |
| Winter | 3 to 10 ft | midday | Blade bait, Hair jig |
Notable structure
- Deep basin: deep basin, around 10 ft
- Break off the point: drop-off, around 9 ft
- Secondary point: point, around 6 ft
- Main-lake point: point, around 4 ft
- Shallow bay flat: weed flat, around 3 ft
- Back-bay flat: weed flat, around 2 ft
Common questions
How deep is Flatt Lake?
Flatt Lake is about 10 ft at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.
What fish are in Flatt Lake?
Anglers target smallmouth bass, walleye, northern pike, yellow perch on Flatt Lake.
Where is the best fishing spot on Flatt Lake?
Break off the point is the top-rated area: a drop-off in about 9 ft of water that rates prime for walleye in fall. Open the map above to see every rated spot for each species and season.
When is the best time to fish Flatt Lake?
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.
Nearby waters
Rufus Lake · Lepp Lake · Opasatika Lake 4 · Opasakita Lake 12 · Penelton Lake · Little Rice Lake
See how Flatt Lake stacks up: best smallmouth bass lakes in Ontario · best walleye lakes in Ontario · best northern pike lakes in Ontario · best yellow perch lakes in Ontario
Browse all Ontario fishing maps or every water on DepthScout. Bathymetry credit: state fisheries survey programs. How we build these maps. For fishing guidance only, never navigation.