Douglas County Lake Quality
Kansas, 5 lakes, average grade C (Fair)
Douglas County has 5 monitored 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. 4 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. 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 Douglas Co State Fishing Lake (A); the most-stressed is Potter'S Lake (D).
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Quick Answers for Douglas County
Planning a trip? Check special fishing regulations for Douglas Co State Fishing Lake — or check the official Kansas fishing regulations.
All Lakes in Douglas County
5 lakes · 4 graded, 1 not rated4 graded lakes · 1 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | ADouglas Co State Fishing LakeDouglas | A | 9.5 ft | 20 µg/L | 6.9 µg/L | No recent samples | Not recorded |
| 2 | CClinton LakeDouglas | C | 3.8 ft | 42 µg/L | 14.9 µg/L | No recent samples | ✓ Public |
| 3 | DPotter'S LakeDouglas | D | 4.4 ft | 45 µg/L | 26.5 µg/L | No recent samples | Not recorded |
| 4 | DLone Star LakeDouglas | D | 3.1 ft | 32.5 µg/L | 28.5 µg/L | No recent samples | Not recorded |
| NRSpring Creek Park LakeDouglas | NR | 1 ft | No recent samples | 104.6 µg/L | 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 Douglas 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.