Marion County Lake Quality
Kansas, 2 lakes, average grade D (Poor)
Marion 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. On average, Marion County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.
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. Marion Co Lake (D) is the cleanest in the county.
Quick Answers for Marion County
Planning a trip? Check special fishing regulations for Marion Co Lake — or check the official Kansas fishing regulations.
All Lakes in Marion County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Marion Co Lake | D | 2.9 ft | 40 µg/L |
| 2 | Marion Lake | D | 2 ft | 230 µg/L |
Other Counties in Kansas
See how Marion 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 Marion County
Top-rated places to stay near Marion County
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Source: EPA National Aquatic Resource Surveys, 2026.