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Best flathead catfish lakes in Illinois

29 Illinois waters hold flathead catfish, 8 mapped with real state-agency depth surveys. Ranked below by size and depth-data quality — open any water to see exactly where to fish it: depth contours, scored spots with plain-English reasons, seasonal windows and bait picks. Solitary giant that lairs in log jams and deep holes by day and prowls at night — live bait only.

1. Lake Shelbyville — 65 ft max · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #1: mapped size signal; contours are approximated · no verified access record attached
2. Lake Springfield — 22 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #2: survey-backed contours receive the ranking's data-quality boost · 9 public access sites
3. Carlyle Lake — 35 ft max · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #3: mapped size signal; contours are approximated · no verified access record attached
4. Mississippi River Pool 19 (Keokuk) — 43 ft max · survey depth data · Largemouth Bass, Walleye, White Bass, SaugerWhy #4: survey-backed contours receive the ranking's data-quality boost · 3 public access sites
5. Illinois River — 25 ft max · Largemouth Bass, Walleye, White Bass, SaugerWhy #5: mapped size signal; contours are approximated · 14 public access sites
6. Mississippi River Pool 13 (Clinton) — 53 ft max · survey depth data · Largemouth Bass, Walleye, White Bass, SaugerWhy #6: survey-backed contours receive the ranking's data-quality boost · 4 public access sites
7. Rend Lake — 31 ft max · Largemouth Bass, White Bass, Crappie, BluegillWhy #7: mapped size signal; contours are approximated · no verified access record attached
8. Rock River — 15 ft max · Smallmouth Bass, Walleye, White Bass, Northern PikeWhy #8: mapped size signal; contours are approximated · 14 public access sites
9. Sangamon River — 12 ft max · Largemouth Bass, White Bass, Channel Catfish, Flathead CatfishWhy #9: mapped size signal; contours are approximated · 3 public access sites
10. Lake Decatur — 28 ft max · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #10: mapped size signal; contours are approximated · no verified access record attached
11. Kinkaid Lake — 80 ft max · Largemouth Bass, Smallmouth Bass, Walleye, CrappieWhy #11: mapped size signal; contours are approximated · no verified access record attached
12. Sangchris Lake — 40 ft max · Largemouth Bass, White Bass, Crappie, BluegillWhy #12: mapped size signal; contours are approximated · no verified access record attached
13. Lake Mattoon — 28 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Saugeye, CrappieWhy #13: survey-backed contours receive the ranking's data-quality boost · no verified access record attached
14. Kaskaskia River — 15 ft max · Largemouth Bass, White Bass, Crappie, Channel CatfishWhy #14: mapped size signal; contours are approximated · 3 public access sites
15. Mackinaw River — 8 ft max · Smallmouth Bass, Channel Catfish, Flathead Catfish, Longnose GarWhy #15: mapped size signal; contours are approximated · no verified access record attached
16. Illinois Waterway — Dresden Island Pool — 31 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #16: survey-backed contours receive the ranking's data-quality boost · 4 public access sites
17. Fox River — 10 ft max · Smallmouth Bass, Walleye, White Bass, Northern PikeWhy #17: mapped size signal; contours are approximated · 18 public access sites
18. Embarras River — 10 ft max · Smallmouth Bass, Channel Catfish, Flathead Catfish, Common CarpWhy #18: mapped size signal; contours are approximated · no verified access record attached
19. Cedar Lake — 45 ft max · Largemouth Bass, Crappie, Bluegill, Channel CatfishWhy #19: mapped size signal; contours are approximated · no verified access record attached
20. Walnut Point Lake — 28 ft max · survey depth data · Largemouth Bass, Crappie, Bluegill, Channel CatfishWhy #20: survey-backed contours receive the ranking's data-quality boost · no verified access record attached
21. Canton Lake — 35 ft max · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #21: mapped size signal; contours are approximated · no verified access record attached
22. Lake George — 58 ft max · Largemouth Bass, Smallmouth Bass, Walleye, SaugerWhy #22: mapped size signal; contours are approximated · no verified access record attached
23. Lake Paradise — 19 ft max · Largemouth Bass, Smallmouth Bass, Walleye, SaugeyeWhy #23: mapped size signal; contours are approximated · no verified access record attached
24. Cedar Lake — 44 ft max · Largemouth Bass, Crappie, Bluegill, Channel CatfishWhy #24: mapped size signal; contours are approximated · no verified access record attached
25. Lake Murphysboro — 32 ft max · Largemouth Bass, Crappie, Bluegill, Channel CatfishWhy #25: mapped size signal; contours are approximated · no verified access record attached

…plus 4 more Illinois waters holding flathead catfish.

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When to fish flathead catfish in Illinois

• Spring 5–20 ft — Pre-spawn fish feed hard near wood cover and hole edges.
• Summer 8–30 ft — Day = log-jam lairs and deep holes. Night = shallow flats and bar edges with big live bait.
• Fall 10–35 ft — Fish concentrate near wintering holes — the year's best big-fish window.
• Winter 20–45 ft — Stacked and sluggish in the deepest holes.

Also in Illinois: best largemouth bass lakes · best smallmouth bass lakes · best walleye lakes · best white bass lakes · best saugeye lakes · best sauger lakes · best northern pike lakes · best crappie lakes · best bluegill lakes · best channel catfish lakes · best muskellunge lakes · best striped bass lakes · best white bass & hybrids lakes · best yellow perch lakes · best blue catfish lakes · best freshwater drum lakes · best common carp lakes

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