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57-acre lake in South Dakota. The lake tops out around 20 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. Every species below gets its seasonal read from the same numbers driving the chart.
Drawn out, this is 57 acres of water rimmed by 1.7 miles of bank. The shoreline is moderately structured (index 1.6) — enough points and pockets to pattern. About 76% of the surface sits shallower than 15 ft on the modeled chart — that's the weed-and-bait zone. Call it 0.6 mi long by 0.3 mi wide at the broadest reach. The nearest mapped water is Pierpont Lake, 8 mi to the west.
Start shallow in spring: largemouth bass sit in 2 to 10 ft that time of year. Summer pushes them deeper, 8 to 20 ft, and winter fish settle into 6 to 20 ft. The spot to know is Shallow bay flat, a weed flat in about 3 ft of water that rates prime for largemouth bass in spring. Warm-month bites cluster around early morning and the evening. 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 | 2 to 10 ft | dawn & dusk | Shallow bay flat (3 ft) | Spinnerbait, Chatterbait |
| Summer | 8 to 20 ft | dawn & dusk | Break off the point (9 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 | 6 to 20 ft | midday | Break off the point (9 ft) | Blade bait, Jigging spoon |
Spring puts bluegill in skinny water — 1 to 6 ft is the zone. As the season builds they drop to 4 to 15 ft, wintering in 6 to 20 ft. Spring bluegill concentrate at Shallow bay flat, a prime-rated weed flat around 3 ft. Warm-month bites cluster around early morning and the evening. A small sponge spider (fly) or a micro tube jig covers the summer program.
| 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 (9 ft) | Micro jig + waxworm, Small spoon tipped |
| Winter | 6 to 20 ft | midday | Deep basin (17 ft) | Tungsten ice jig + plastic, Tiny spoon |
Start shallow in spring: channel catfish sit in 3 to 12 ft that time of year. Summer pushes them deeper, 6 to 20 ft, and winter fish settle into 6 to 20 ft. The spot to know is Deep basin, a deep basin in about 17 ft of water that rates prime for channel catfish in winter. Warm-month bites cluster around 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 | 6 to 20 ft | night & dusk | Deep basin (17 ft) | |
| Fall | 6 to 20 ft | dusk | Deep basin (17 ft) | |
| Winter | 6 to 20 ft | midday | Deep basin (17 ft) |
The spring pattern is a shallow one: crappie in 2 to 8 ft. As the season builds they drop to 6 to 20 ft, wintering in 6 to 20 ft. Top water on the chart: Deep basin, a deep basin in the 17 ft range, prime in winter. Time it for early morning and the evening. Summer baits: a jig trolled/spider-rigged or a small crankbait (trolled) gets it done.
| 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 | 6 to 20 ft | dawn & dusk | Break off the point (9 ft) | Jig trolled/spider-rigged, Small crankbait (trolled) |
| Fall | 8 to 20 ft | dawn | Break off the point (9 ft) | Jig + minnow combo, Small swimbait (1.5-2") |
| Winter | 6 to 20 ft | midday | Deep basin (17 ft) | Tungsten jig + soft plastic, Tiny jigging spoon |
Lynn Lake carries 6 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 17 ft down.
Season dates, license requirements, and size and bag limits for South Dakota waters are set by the South Dakota Game, Fish and Parks — and special regulations can apply to Lynn Lake specifically, so confirm the current rules before you fish.
Check the official South Dakota fishing regulations →
Lynn Lake is about 20 ft (6 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 Lynn 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. The interactive chart above rates every 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 Lynn Lake is regulated by the South Dakota Game, Fish and Parks. Check the official South Dakota regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Pierpont Lake 8 mi · Opitz Lake 13 mi · Waubay Lake 13 mi · Nutleg East 14 mi · Kettle Lake 16 mi · Horseshoe Lake 18 mi · Pickerel Lake 19 mi · Blue Dog Lake 19 mi · Roy Lake 20 mi · Enemy Swim Lake 20 mi · Bitter Lake 20 mi · Lake Isabella 20 mi
See how Lynn Lake stacks up: best largemouth bass lakes in South Dakota · best crappie lakes in South Dakota · best bluegill lakes in South Dakota · best channel catfish lakes in South Dakota
Browse all South Dakota 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.