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Fishing Lake Decatur: what the data says
2,905-acre lake near Illinois. The lake tops out around 28 ft. The contours are modeled from the water's real shoreline and maximum depth. Treat them as a rough guide, and never use them for navigation. What follows comes from the same scoring engine that paints the spots above.
Bluegill fishing at Lake Decatur
Start shallow in spring: bluegill sit in 1 to 6 ft that time of year. Summer pushes them deeper, 4 to 15 ft, and winter fish settle into 10 to 25 ft. The spot to know is Shallow bay flat, a weed flat in about 3 ft of water that rates prime for bluegill in spring. In summer the feeding windows fall in early morning and the evening. Tie on a small sponge spider (fly) or a micro tube jig and you're in the game.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 1 to 6 ft | midday & dusk | 1/32 oz jig + micro plastic, Tiny popper (evenings) |
| Summer | 4 to 15 ft | dawn & dusk | Small sponge spider (fly), Micro tube jig |
| Fall | 6 to 18 ft | midday | Micro jig + waxworm, Small spoon tipped |
| Winter | 10 to 25 ft | midday | Tungsten ice jig + plastic, Tiny spoon |
Channel Catfish fishing at Lake Decatur
In spring, channel catfish run shallow here, mostly 3 to 12 ft. Summer pushes them deeper, 8 to 25 ft, and winter fish settle into 8 to 28 ft. Deep basin is the standout, a deep basin at roughly 24 ft, rated prime for winter channel catfish. Best bite is after dark and the evening.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 12 ft | dusk | |
| Summer | 8 to 25 ft | night & dusk | |
| Fall | 8 to 28 ft | dusk | |
| Winter | 8 to 28 ft | midday |
Common Carp fishing at Lake Decatur
Spring common carp on Lake Decatur hold shallow, usually 2 to 10 ft. By summer they slide out to 3 to 15 ft, and by winter most fish are in 8 to 28 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 3 ft that scores prime in spring. Best bite is early morning and the evening.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 10 ft | midday & dawn | |
| Summer | 3 to 15 ft | dawn & dusk | |
| Fall | 5 to 18 ft | midday | |
| Winter | 8 to 28 ft | midday |
Crappie fishing at Lake Decatur
In spring, crappie run shallow here, mostly 2 to 8 ft. Summer pushes them deeper, 10 to 25 ft, and winter fish settle into 8 to 28 ft. The spot to know is Deep basin, a deep basin in about 24 ft of water that rates prime for crappie in winter. In summer the feeding windows fall in early morning and the evening. A jig trolled/spider-rigged or a small crankbait (trolled) covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | 1/16 oz jig + tube, Curly-tail grub |
| Summer | 10 to 25 ft | dawn & dusk | Jig trolled/spider-rigged, Small crankbait (trolled) |
| Fall | 8 to 20 ft | dawn | Jig + minnow combo, Small swimbait (1.5-2") |
| Winter | 8 to 28 ft | midday | Tungsten jig + soft plastic, Tiny jigging spoon |
Flathead Catfish fishing at Lake Decatur
In spring, flathead catfish run shallow here, mostly 5 to 20 ft. Summer pushes them deeper, 7 to 28 ft, and winter fish settle into 8 to 28 ft. The spot to know is Deep basin, a deep basin in about 24 ft of water that rates prime for flathead catfish in fall. Plan around after dark and the evening in the warm months.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 5 to 20 ft | night & dusk | |
| Summer | 7 to 28 ft | night & dusk | |
| Fall | 8 to 28 ft | night & dusk | |
| Winter | 8 to 28 ft | midday |
Freshwater Drum fishing at Lake Decatur
In spring, freshwater drum run shallow here, mostly 5 to 20 ft. Summer pushes them deeper, 7 to 28 ft, and winter fish settle into 8 to 28 ft. Deep basin is the standout, a deep basin at roughly 24 ft, rated prime for winter freshwater drum. Best bite is the evening. Tie on a jig + crawler combo or a small crankbait (slow) and you're in the game.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 5 to 20 ft | midday & dawn | Jig + curly tail (bounced), Small blade bait |
| Summer | 7 to 28 ft | dusk | Jig + crawler combo, Small crankbait (slow) |
| Fall | 8 to 28 ft | midday | Blade bait (vertical), Jigging spoon |
| Winter | 8 to 28 ft | midday | Jigging spoon (slow) |
Lake Decatur also holds largemouth bass (8 to 20 ft in summer), sauger (8 to 28 ft in summer), saugeye (8 to 22 ft in summer), smallmouth bass (8 to 28 ft in summer), striped bass (8 to 28 ft in summer), walleye (8 to 28 ft in summer), white bass (8 to 25 ft in summer), white bass & hybrids (8 to 28 ft in summer). Pick any of them on the map above for rated spots and bait picks.
Notable structure
- Deep basin: deep basin, around 24 ft
- Break off the point: drop-off, around 13 ft
- Main-lake point: point, around 8 ft
- Secondary point: point, around 8 ft
- Dock / pier line: dock line, around 6 ft
- Dock / pier line: dock line, around 6 ft
- Dock / pier line: dock line, around 6 ft
- Shoreline point: point, around 5.480258511016597 ft
- Gravel shoal: gravel shoal, around 4.385094477873614 ft
- Shallow bay flat: weed flat, around 3 ft
- Back-bay flat: weed flat, around 3 ft
- Gravel shoal: gravel shoal, around 2.2925983400187295 ft
- Weed flat: weed flat, around 2 ft
- Weed flat: weed flat, around 2 ft
Common questions
How deep is Lake Decatur?
Lake Decatur is about 28 ft (9 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.
What fish are in Lake Decatur?
Anglers target largemouth bass, smallmouth bass, walleye, white bass, saugeye, sauger, crappie, bluegill, channel catfish, striped bass, white bass & hybrids, flathead catfish, freshwater drum, common carp on Lake Decatur.
Where is the best fishing spot on Lake Decatur?
Shallow bay flat is the top-rated area: a weed flat in about 3 ft of water that rates prime for bluegill in spring. Open the map above to see every rated spot for each species and season.
When is the best time to fish Lake Decatur?
For bluegill, 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.
Nearby waters
Lake Clinton · Lake Shelbyville · Taylorville Lake · Sangamon River · Lake of the Woods · Dawson Lake
See how Lake Decatur stacks up: best largemouth bass lakes in Illinois · best smallmouth bass lakes in Illinois · best walleye lakes in Illinois · best white bass lakes in Illinois
Browse all Illinois fishing maps or every water on DepthScout. How we build these maps. For fishing guidance only, never navigation.