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Below Lake Decatur to Petersburg: cats and white bass through Lincoln country. The river tops out around 12 ft. These contours are modeled — built from the real shoreline and the water's maximum depth — so read them as a guide, never as navigation. What the data behind the map says about each species, season by season:
Drawn out, this is 5,801 acres of water rimmed by 149 miles of bank. That shoreline is heavily fingered (development index 14) — bays, points and pockets everywhere, which multiplies the fishable edge. All of it is shallow-zone water — under ~15 ft across the entire basin, so the food chain has the run of the place. The basin spans about 48.5 mi end to end and 13 mi across at its widest. The water lies in Sangamon County. The nearest mapped water is Lake Springfield, 17 mi to the southwest.
Spring puts channel catfish in skinny water — 3 to 12 ft is the zone. Summer fish stay in 4 to 12 ft, and winter fish hold in 4 to 12 ft. Spring channel catfish concentrate at South Fork confluence, a prime-rated inflow / creek mouth around 7 ft. 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 | South Fork confluence (7 ft) | |
| Summer | 4 to 12 ft | night & dusk | Lake Decatur dam tailrace (10 ft) | |
| Fall | 4 to 12 ft | dusk | Lake Decatur dam tailrace (10 ft) | |
| Winter | 4 to 12 ft | midday | Lake Decatur dam tailrace (10 ft) |
The spring pattern is a shallow one: flathead catfish in 3 to 12 ft. The depth story barely changes: 3 to 12 ft through summer, 4 to 12 ft in winter. Top water on the chart: Illiopolis snag reach, a standing timber / brush in the 8 ft range, prime in spring. Time it for after dark and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | night & dusk | Illiopolis snag reach (8 ft) | |
| Summer | 3 to 12 ft | night & dusk | Illiopolis snag reach (8 ft) | |
| Fall | 3 to 12 ft | night & dusk | Tailout eddy (mile 60.8) (7 ft) | |
| Winter | 4 to 12 ft | midday | Tailout eddy (mile 60.8) (7 ft) |
Come spring, look for white bass tight to the bank in 2 to 12 ft. Through summer count on 4 to 12 ft; the winter hold is 4 to 12 ft. If you only fish one area, make it South Fork confluence: an inflow / creek mouth around 7 ft that scores prime in spring. Best bite is early morning and the evening. A slab spoon or a small topwater (schooling fish) is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 12 ft | dawn & dusk | South Fork confluence (7 ft) | Curly-tail jig (white), Small lipless crank |
| Summer | 4 to 12 ft | dawn & dusk | Cilca Lake Dam tailrace (10 ft) | Slab spoon, Small topwater (schooling fish) |
| Fall | 3 to 12 ft | dawn & dusk | Cilca Lake Dam tailrace (10 ft) | Jigging spoon, Blade bait |
| Winter | 4 to 12 ft | midday | Cilca Lake Dam tailrace (10 ft) | Jigging spoon (deep), Blade bait |
Spring puts largemouth bass in skinny water — 2 to 10 ft is the zone. As the season builds they drop to 4 to 12 ft, wintering in 4 to 12 ft. Spring largemouth bass concentrate at Illiopolis snag reach, a prime-rated standing timber / brush around 8 ft. Warm-month bites cluster around early morning and the evening. A texas-rigged 10" worm or a deep-diving crankbait covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | dawn & dusk | Illiopolis snag reach (8 ft) | Spinnerbait, Chatterbait |
| Summer | 4 to 12 ft | dawn & dusk | Illiopolis snag reach (8 ft) | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 3 to 12 ft | midday & dawn | Lake Decatur dam tailrace (10 ft) | Squarebill crankbait (shad), Spinnerbait |
| Winter | 4 to 12 ft | midday | Lake Decatur dam tailrace (10 ft) | Blade bait, Jigging spoon |
The spring pattern is a shallow one: freshwater drum in 3 to 12 ft. The depth story barely changes: 3 to 12 ft through summer, 4 to 12 ft in winter. The spot to know is Lake Decatur dam tailrace, a creek channel in about 10 ft of water that rates prime for freshwater drum in summer. Plan around the evening in the warm months. Summer baits: a jig + crawler combo or a small crankbait (slow) gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | South Fork confluence (7 ft) | Jig + curly tail (bounced), Small blade bait |
| Summer | 3 to 12 ft | dusk | Lake Decatur dam tailrace (10 ft) | Jig + crawler combo, Small crankbait (slow) |
| Fall | 3 to 12 ft | midday | Lake Decatur dam tailrace (10 ft) | Blade bait (vertical), Jigging spoon |
| Winter | 4 to 12 ft | midday | Lake Decatur dam tailrace (10 ft) | Jigging spoon (slow) |
Start shallow in spring: common carp sit in 2 to 10 ft that time of year. Warm water sends them out to 2 to 12 ft; cold water stacks them in 4 to 12 ft. Top water on the chart: South Fork confluence, an inflow / creek mouth in the 7 ft range, prime in spring. Fish it in early morning and the evening and you'll meet the bite.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | midday & dawn | South Fork confluence (7 ft) | |
| Summer | 2 to 12 ft | dawn & dusk | South Fork confluence (7 ft) | |
| Fall | 3 to 12 ft | midday | Lake Decatur dam tailrace (10 ft) | |
| Winter | 4 to 12 ft | midday | Tailout eddy (mile 60.8) (7 ft) |
Count 40 structure marks on this chart. The deepest, Lake Decatur dam tailrace, sits near 10 ft.
Access data: OpenStreetMap contributors (ODbL) — community-mapped launches. Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for Illinois waters are set by the Illinois DNR — and special regulations can apply to Sangamon River specifically, so confirm the current rules before you fish.
Check the official Illinois fishing regulations →
Sangamon River 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 channel catfish, flathead catfish, white bass, largemouth bass, freshwater drum, common carp on Sangamon River.
South Fork confluence is the top-rated area: an inflow / creek mouth in about 7 ft of water that rates prime for channel catfish in spring. The interactive chart above rates every spot for each species and season.
For channel catfish, the summer bite is best in after dark 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 Sangamon River 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 Springfield 17 mi · Sangchris Lake 19 mi · Taylorville Lake 27 mi · Lake Decatur 28 mi · Sunset Lake 38 mi · Lake Clinton 39 mi · Otter Lake 41 mi · Mauvaise Terre Lake 44 mi · Lake Jacksonville 44 mi · Mackinaw River 45 mi · Lake Glenn Shoals 46 mi · Lake Lou Yaeger 46 mi
See how Sangamon River stacks up: best largemouth bass lakes in Illinois · best white bass lakes in Illinois · best channel catfish lakes in Illinois · best flathead 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.