Miami County Lake Quality
Kansas, 6 lakes, average grade C (Fair)
Miami County holds 6 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. Miami County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Louisburg State Fishing Lake (B) is the cleanest in the county.
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Quick Answers for Miami County
Planning a trip? Check special fishing regulations for Louisburg State Fishing Lake — or check the official Kansas fishing regulations.
All Lakes in Miami County
6 lakes · 3 graded, 3 not rated3 graded lakes · 3 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | BLouisburg State Fishing LakeMiami | B | 3 ft | 45 µg/L | 10 µg/L | No recent samples | Not recorded |
| 2 | CHillsdale LakeMiami | C | 3.7 ft | 29 µg/L | 17 µg/L | No recent samples | ✓ Public |
| 3 | FMiami Co State Fishing LakeMiami | F | 2 ft | 90 µg/L | 53.1 µg/L | No recent samples | ✓ Public |
| NRMiola LakeMiami | NR | 5.2 ft | 20 µg/L | 10.4 µg/L | No recent samples | Not recorded | |
| NRLouisburg Old LakeMiami | NR | 3.9 ft | No recent samples | 5 µg/L | No recent samples | Not recorded | |
| NROsawatomie LakeMiami | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
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 Kansas
See how Miami 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.