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Rating depth structure for largemouth bass.
Shared by DepthScout anglers. Exact spots stay private, always.
645-acre reservoir in Marion County, Illinois. The lake tops out around 12 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. What follows comes from the same scoring engine that paints the spots above.
Traced from the shoreline, Centralia Reservoir runs 613 acres with 9.8 miles of edge. That shoreline is heavily fingered (development index 2.8) — bays, points and pockets everywhere, which multiplies the fishable edge. Nothing on this chart breaks 15 ft, which makes the whole surface littoral: weeds, bait and ambush cover everywhere. End to end it runs roughly 2.5 mi, about 0.9 mi across. You'll find it in Marion County. Closest neighbour on DepthScout: Lake Centralia, 5 mi east of here.
The spring pattern is a shallow one: bluegill in 1 to 6 ft. Midsummer fish sit out in 3 to 12 ft before dropping to 4 to 12 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 12 ft | dawn & dusk | Shallow bay flat (3 ft) | Small sponge spider (fly), Micro tube jig |
| Fall | 4 to 12 ft | midday | Shallow bay flat (3 ft) | Micro jig + waxworm, Small spoon tipped |
| Winter | 4 to 12 ft | midday | Deep basin (10 ft) | Tungsten ice jig + plastic, Tiny spoon |
In spring, channel catfish run shallow here, mostly 3 to 12 ft. Summer keeps them at 4 to 12 ft, and they winter in 4 to 12 ft. Winter channel catfish concentrate at Deep basin, a prime-rated deep basin around 10 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 12 ft | dusk | Shallow bay flat (3 ft) | |
| Summer | 4 to 12 ft | night & dusk | Deep basin (10 ft) | |
| Fall | 4 to 12 ft | dusk | Deep basin (10 ft) | |
| Winter | 4 to 12 ft | midday | Deep basin (10 ft) |
The spring pattern is a shallow one: common carp in 2 to 10 ft. As the season builds they drop to 2 to 12 ft, wintering in 4 to 12 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.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | midday & dawn | Shallow bay flat (3 ft) | |
| Summer | 2 to 12 ft | dawn & dusk | Shallow bay flat (3 ft) | |
| Fall | 3 to 12 ft | midday | Shallow bay flat (3 ft) | |
| Winter | 4 to 12 ft | midday | Deep basin (10 ft) |
Spring puts crappie in skinny water — 2 to 8 ft is the zone. Warm water sends them out to 4 to 12 ft; cold water stacks them in 4 to 12 ft. Deep basin is the standout, a deep basin at roughly 10 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 | 4 to 12 ft | dawn & dusk | Deep basin (10 ft) | Jig trolled/spider-rigged, Small crankbait (trolled) |
| Fall | 4 to 12 ft | dawn | Deep basin (10 ft) | Jig + minnow combo, Small swimbait (1.5-2") |
| Winter | 4 to 12 ft | midday | Deep basin (10 ft) | Tungsten jig + soft plastic, Tiny jigging spoon |
In spring, largemouth bass run shallow here, mostly 2 to 10 ft. Midsummer fish sit out in 4 to 12 ft before dropping to 4 to 12 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 | 4 to 12 ft | dawn & dusk | Main-lake point (8 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 3 to 12 ft | midday & dawn | Main-lake point (8 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 4 to 12 ft | midday | Deep basin (10 ft) | Blade bait, Jigging spoon |
Centralia Reservoir carries 7 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 10 ft down.
Season dates, license requirements, and size and bag limits for Illinois waters are set by the Illinois DNR — and special regulations can apply to Centralia Reservoir specifically, so confirm the current rules before you fish.
Check the official Illinois fishing regulations →
Centralia Reservoir is about 12 ft (4 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 bluegill, channel catfish, common carp, crappie, largemouth bass on Centralia Reservoir.
Shallow bay flat is the top-rated area: a weed flat in about 3 ft of water that rates prime for bluegill in spring. The map above holds the full rated-spot list for every species and season.
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.
Fishing on Centralia Reservoir is regulated by the Illinois DNR. Check the official Illinois regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Lake Centralia 5 mi · Carlyle Lake 16 mi · Forbes Lake 22 mi · Washington County Lake 23 mi · Kaskaskia River 26 mi · Sam Dale Lake 27 mi · Rend Lake 31 mi · Lake Altamont 40 mi · Sara Lake 47 mi · Baldwin Lake 48 mi · Newton Lake 51 mi · Lake Glenn Shoals 51 mi
See how Centralia Reservoir stacks up: best largemouth bass lakes in Illinois · best crappie lakes in Illinois · best bluegill lakes in Illinois · best channel catfish lakes in Illinois
Browse all Illinois 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.