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Best smallmouth bass lakes in Iowa

43 Iowa waters hold smallmouth bass, 37 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. Current- and rock-loving fighter. Lives around gravel, boulders and hard-bottom structure.

1. Cedar River — 10 ft max · Smallmouth Bass, Walleye, Channel Catfish, Flathead CatfishWhy #1: mapped size signal; contours are approximated · 23 public access sites
2. West Okoboji Lake — 135 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, CrappieWhy #2: survey-backed contours receive the ranking's data-quality boost · 1 public access site
3. Spirit Lake — 22 ft max · survey depth data · Smallmouth Bass, Walleye, Northern Pike, CrappieWhy #3: survey-backed contours receive the ranking's data-quality boost · 8 public access sites
4. Wapsipinicon River — 10 ft max · Smallmouth Bass, Walleye, Channel Catfish, Common CarpWhy #4: mapped size signal; contours are approximated · 11 public access sites
5. Five Island Lake — 22 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #5: survey-backed contours receive the ranking's data-quality boost · 4 public access sites
6. Upper Iowa River — 6 ft max · Smallmouth Bass, Walleye, Channel Catfish, Rainbow TroutWhy #6: mapped size signal; contours are approximated · 1 public access site
7. Green Valley Lake — 22 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #7: survey-backed contours receive the ranking's data-quality boost · no verified access record attached
8. Maquoketa River — 6 ft max · Smallmouth Bass, Walleye, Northern Pike, Channel CatfishWhy #8: mapped size signal; contours are approximated · 4 public access sites
9. Lost Grove Lake — 48 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #9: survey-backed contours receive the ranking's data-quality boost · 7 public access sites
10. Lake Belva Deer — 40 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #10: survey-backed contours receive the ranking's data-quality boost · no verified access record attached
11. Big Hollow Lake — 44 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #11: survey-backed contours receive the ranking's data-quality boost · 1 public access site
12. Turkey River — 9 ft max · Smallmouth Bass, Walleye, Channel CatfishWhy #12: mapped size signal; contours are approximated · 6 public access sites
13. Little River Watershed Lake — 32 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #13: survey-backed contours receive the ranking's data-quality boost · 4 public access sites
14. Lake Geode — 39 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #14: survey-backed contours receive the ranking's data-quality boost · 3 public access sites
15. Shell Rock River — 8 ft max · Smallmouth Bass, Walleye, Channel Catfish, Common CarpWhy #15: mapped size signal; contours are approximated · 6 public access sites
16. Hawthorn Lake — 28 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #16: survey-backed contours receive the ranking's data-quality boost · 2 public access sites
17. Centerville Upper Reservoir — 30 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #17: survey-backed contours receive the ranking's data-quality boost · no verified access record attached
18. Don Williams Lake — 36 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #18: survey-backed contours receive the ranking's data-quality boost · 2 public access sites
19. Hickory Grove Lake — 32 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #19: survey-backed contours receive the ranking's data-quality boost · 2 public access sites
20. Red Haw Lake — 36 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #20: survey-backed contours receive the ranking's data-quality boost · 2 public access sites
21. Lake of Three Fires — 22 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #21: survey-backed contours receive the ranking's data-quality boost · 1 public access site
22. Iowa Lake (Iowa Co.) — 28 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #22: survey-backed contours receive the ranking's data-quality boost · 1 public access site
23. Beeds Lake — 22 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #23: survey-backed contours receive the ranking's data-quality boost · 1 public access site
24. Nine Eagles Lake — 30 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #24: survey-backed contours receive the ranking's data-quality boost · no verified access record attached
25. Greenfield Lake — 24 ft max · survey depth data · Largemouth Bass, Smallmouth Bass, Walleye, White BassWhy #25: survey-backed contours receive the ranking's data-quality boost · 1 public access site

…plus 18 more Iowa waters holding smallmouth bass.

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When to fish smallmouth bass in Iowa

• Spring 3–12 ft — Gravel and rock flats near deep water; spawning happens on hard bottom.
• Summer 10–30 ft — Offshore rock humps and deep points; smallmouth suspend near bait.
• Fall 8–25 ft — Feeding hard for winter — long tapering points and rocky drops.
• Winter 20–45 ft — Deep, vertical presentations near rocky wintering holes.

Also in Iowa: best largemouth bass lakes · best walleye lakes · best white bass lakes · best northern pike lakes · best crappie lakes · best bluegill lakes · best channel catfish lakes · best muskellunge lakes · best yellow perch lakes · best flathead catfish lakes · best freshwater drum lakes · best common carp lakes

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