Miami County Lake Quality
Kansas, 6 lakes, average grade C (Fair)
Only 6 lakes in Miami County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
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 Louisburg Old Lake (B); the most-stressed is Nla Lake (D).
Quick Answers for Miami County
Planning a trip? Check special fishing regulations for Louisburg Old Lake — or check the official Kansas fishing regulations.
All Lakes in Miami County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Louisburg Old Lake | B | 3.9 ft | - |
| 2 | Louisburg State Fishing Lake | B | 3 ft | 21 µg/L |
| 3 | Hillsdale Lake | C | 3.7 ft | 30 µg/L |
| 4 | Miola Lake | C | 5.2 ft | - |
| 5 | Nla Lake | D | 2.5 ft | 46000 µg/L |
| 6 | Miami Co State Fishing Lake | D | 2 ft | 43.6 µg/L |
Other Counties in Kansas
See how Miami County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 34 states.
Where to stay near Miami County
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Source: EPA National Aquatic Resource Surveys, 2026.