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73-acre lake in South Dakota. The lake tops out around 11 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 72 acres of water rimmed by 1.4 miles of bank. At index 1.2 the outline is almost a bowl — read the depth changes, not the shoreline. Nothing on this chart breaks 15 ft, which makes the whole surface littoral: weeds, bait and ambush cover everywhere. Figure 0.5 mi of water from one end to the other, 0.3 mi at the beam. Closest neighbour on DepthScout: Red Iron South Lake, 4 mi north of here.
In spring, largemouth bass run shallow here, mostly 2 to 10 ft. Midsummer fish sit out in 3 to 11 ft before dropping to 3 to 11 ft for winter. Spring largemouth bass concentrate at Shallow bay flat, a prime-rated weed flat around 3 ft. Fish it in early morning and the evening and you'll meet the bite. You won't need more than a texas-rigged 10" worm or a deep-diving crankbait most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | dawn & dusk | Shallow bay flat (3 ft) | Spinnerbait, Chatterbait |
| Summer | 3 to 11 ft | dawn & dusk | Shallow bay flat (3 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 3 to 11 ft | midday & dawn | Main-lake point (8 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 3 to 11 ft | midday | Break off the point (5 ft) | Blade bait, Jigging spoon |
The spring pattern is a shallow one: bluegill in 1 to 6 ft. Midsummer fish sit out in 3 to 11 ft before dropping to 3 to 11 ft for winter. The spot to know is Shallow bay flat, a weed flat in about 3 ft of water that rates prime for bluegill in spring. Plan around early morning and the evening in the warm months. Summer baits: a small sponge spider (fly) or a micro tube jig gets it done.
| 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 | 3 to 11 ft | dawn & dusk | Shallow bay flat (3 ft) | Small sponge spider (fly), Micro tube jig |
| Fall | 3 to 11 ft | midday | Shallow bay flat (3 ft) | Micro jig + waxworm, Small spoon tipped |
| Winter | 3 to 11 ft | midday | Deep basin (9 ft) | Tungsten ice jig + plastic, Tiny spoon |
In spring, channel catfish run shallow here, mostly 3 to 11 ft. Summer keeps them at 3 to 11 ft, and they winter in 3 to 11 ft. Winter channel catfish concentrate at Deep basin, a prime-rated deep basin around 9 ft. Fish it in after dark and the evening and you'll meet the bite.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 11 ft | dusk | Shallow bay flat (3 ft) | |
| Summer | 3 to 11 ft | night & dusk | Deep basin (9 ft) | |
| Fall | 3 to 11 ft | dusk | Deep basin (9 ft) | |
| Winter | 3 to 11 ft | midday | Deep basin (9 ft) |
Spring puts crappie in skinny water — 2 to 8 ft is the zone. Warm water sends them out to 3 to 11 ft; cold water stacks them in 3 to 11 ft. Deep basin is the standout, a deep basin at roughly 9 ft, rated prime for winter crappie. Plan around early morning and the evening in the warm months. A jig trolled/spider-rigged or a small crankbait (trolled) covers the summer program.
| 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 | 3 to 11 ft | dawn & dusk | Shallow bay flat (3 ft) | Jig trolled/spider-rigged, Small crankbait (trolled) |
| Fall | 3 to 11 ft | dawn | Shallow bay flat (3 ft) | Jig + minnow combo, Small swimbait (1.5-2") |
| Winter | 3 to 11 ft | midday | Deep basin (9 ft) | Tungsten jig + soft plastic, Tiny jigging spoon |
Count 6 structure marks on this chart. The deepest, Deep basin, sits near 9 ft.
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 Lake Isabella specifically, so confirm the current rules before you fish.
Check the official South Dakota fishing regulations →
Lake Isabella is about 11 ft (3 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 Lake Isabella.
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 map above holds the full rated-spot list for every 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 Lake Isabella 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.
Red Iron South Lake 4 mi · Clear Lake 4 mi · Roy Lake 6 mi · Nutleg East 7 mi · Opitz Lake 8 mi · Kettle Lake 8 mi · Pickerel Lake 10 mi · Nine Mile Lake 11 mi · Enemy Swim Lake 14 mi · Waubay Lake 16 mi · Blue Dog Lake 20 mi · White Lake 20 mi
See how Lake Isabella 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.