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1,834-acre lake in Minnesota. The lake tops out around 18 ft. The chart is a model: real shoreline, published maximum depth, interpolated in between. A planning tool, never a navigation product. Here's the year, species by species, as the scoring engine sees it.
Drawn out, this is 1,830 acres of water rimmed by 8.7 miles of bank. The shoreline is moderately structured (index 1.5) — enough points and pockets to pattern. Roughly 87% of the water is 15 ft or less as modeled, the band where the food chain lives. Call it 2.9 mi long by 1.9 mi wide at the broadest reach. For a second option, Tamarack lies 4 mi south.
The spring pattern is a shallow one: largemouth bass in 2 to 10 ft. As the season builds they drop to 5 to 18 ft, wintering in 5 to 18 ft. Top water on the chart: Shallow bay flat, a weed flat in the 3 ft range, prime in spring. Time it for early morning and the evening. Summer baits: a texas-rigged 10" worm or a deep-diving crankbait gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | dawn & dusk | Shallow bay flat (3 ft) | Spinnerbait, Chatterbait |
| Summer | 5 to 18 ft | dawn & dusk | Break off the point (8 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 4 to 15 ft | midday & dawn | Main-lake point (8 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 5 to 18 ft | midday | Break off the point (8 ft) | Blade bait, Jigging spoon |
In spring, bluegill run shallow here, mostly 1 to 6 ft. Summer pushes them deeper, 4 to 15 ft, and winter fish settle into 5 to 18 ft. Shallow bay flat is the standout, a weed flat at roughly 3 ft, rated prime for spring bluegill. Time it for early morning and the evening. You won't need more than a small sponge spider (fly) or a micro tube jig most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 6 ft | midday & dusk | Shallow bay flat (3 ft) | 1/32 oz jig + micro plastic, Tiny popper (evenings) |
| Summer | 4 to 15 ft | dawn & dusk | Shallow bay flat (3 ft) | Small sponge spider (fly), Micro tube jig |
| Fall | 6 to 18 ft | midday | Break off the point (8 ft) | Micro jig + waxworm, Small spoon tipped |
| Winter | 5 to 18 ft | midday | Deep basin (15 ft) | Tungsten ice jig + plastic, Tiny spoon |
The spring pattern is a shallow one: channel catfish in 3 to 12 ft. As the season builds they drop to 5 to 18 ft, wintering in 5 to 18 ft. Top water on the chart: Deep basin, a deep basin in the 15 ft range, prime in winter. Time it for after dark and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dusk | Shallow bay flat (3 ft) | |
| Summer | 5 to 18 ft | night & dusk | Deep basin (15 ft) | |
| Fall | 5 to 18 ft | dusk | Deep basin (15 ft) | |
| Winter | 5 to 18 ft | midday | Deep basin (15 ft) |
Start shallow in spring: crappie sit in 2 to 8 ft that time of year. Summer pushes them deeper, 5 to 18 ft, and winter fish settle into 5 to 18 ft. The spot to know is Deep basin, a deep basin in about 15 ft of water that rates prime for crappie in winter. Warm-month bites cluster around early morning and the evening. Throw a jig trolled/spider-rigged or a small crankbait (trolled) until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Shallow bay flat (3 ft) | 1/16 oz jig + tube, Curly-tail grub |
| Summer | 5 to 18 ft | dawn & dusk | Break off the point (8 ft) | Jig trolled/spider-rigged, Small crankbait (trolled) |
| Fall | 5 to 18 ft | dawn | Break off the point (8 ft) | Jig + minnow combo, Small swimbait (1.5-2") |
| Winter | 5 to 18 ft | midday | Deep basin (15 ft) | Tungsten jig + soft plastic, Tiny jigging spoon |
Flat Lake carries 6 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 15 ft down.
Season dates, license requirements, and size and bag limits for Minnesota waters are set by the Minnesota DNR — and special regulations can apply to Flat Lake specifically, so confirm the current rules before you fish.
Check the official Minnesota fishing regulations →
Flat Lake is about 18 ft (5 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 largemouth bass, bluegill, channel catfish, crappie on Flat Lake.
Shallow bay flat is the top-rated area: a weed flat in about 3 ft of water that rates prime for largemouth bass in spring. Open the map above to see every rated spot for each species and season.
For largemouth bass, 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.
Fishing on Flat Lake is regulated by the Minnesota DNR. Check the official Minnesota regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Tamarack 4 mi · Waboose 5 mi · Rice 5 mi · Ice Cracking 6 mi · Little Sugar Bush 6 mi · Rock 6 mi · Height of Land 6 mi · Buffalo 7 mi · Hanson 7 mi · Island 7 mi · Round 7 mi · Strawberry 7 mi
See how Flat Lake stacks up: best largemouth bass lakes in Minnesota · best crappie lakes in Minnesota · best bluegill lakes in Minnesota · best channel catfish lakes in Minnesota
Browse all Minnesota 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.