Lyon County Lake Quality
Kansas, 2 lakes, average grade C (Fair)
Lyon County has 2 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. 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 Lyon Co State Fishing Lake (C); the most-stressed is Olpe City Lake (D).
Quick Answers for Lyon County
Planning a trip? Check special fishing regulations for Lyon Co State Fishing Lake — or check the official Kansas fishing regulations.
All Lakes in Lyon County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lyon Co State Fishing Lake | C | 4.6 ft | - |
| 2 | Olpe City Lake | D | 0.5 ft | 115 µg/L |
Other Counties in Kansas
See how Lyon 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 Lyon County
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Source: EPA National Aquatic Resource Surveys, 2026.