Douglas County Lake Quality
Kansas, 5 lakes, average grade C (Fair)
Douglas County has 5 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. Douglas 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. Douglas Co State Fishing Lake (B) is the cleanest in the county.
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
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Douglas Co State Fishing Lake | B | 9.5 ft | - |
| 2 | Clinton Lake | B | 3.8 ft | 24 µg/L |
| 3 | Potter'S Lake | C | 4.4 ft | 45 µg/L |
| 4 | Lone Star Lake | C | 3.1 ft | 32.5 µg/L |
| 5 | Spring Creek Park Lake | F | 1 ft | - |
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 34 states.
Where to stay near Douglas County
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Source: EPA National Aquatic Resource Surveys, 2026.