Wayne County Lake Quality
Iowa, 4 lakes, average grade D (Nutrient-rich)
Wayne County holds 4 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. 3 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. The county-wide average grade is D — water quality issues are persistent across most of the monitored basins. 2 lakes fall into the F bracket outright.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Bob White Lake (B); the most-stressed is Corydon Reservoir (F).
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Quick Answers for Wayne County
Planning a trip? Check special fishing regulations for Bob White Lake — or check the official Iowa fishing regulations.
All Lakes in Wayne County
4 lakes · 3 graded, 1 not rated3 graded lakes · 1 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | BBob White LakeWayne | B | 0.6 ft | 264 µg/L | 10.1 µg/L | No recent samples | ✓ Public |
| 2 | FCorydon ReservoirWayne | F | 1.9 ft | 612 µg/L | 44 µg/L | No recent samples | Not recorded |
| 3 | FHumeston ReservoirWayne | F | 1.6 ft | 181 µg/L | 41.4 µg/L | No recent samples | Not recorded |
| NRBobwhite State Park LakeWayne | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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Other Counties in Iowa
See how Wayne County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.