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LakeQuality
Late afternoon sun over Slim Lake, scattering a bright path across wind-textured water
F

Clay County Lake Quality

Kansas, 5 lakes, average grade F (Algae-prone)

Clay County holds 5 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. 1 of those lake carry an A–F grade. The county-level summary describes that subset, not every water body listed. The county average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.

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 Milford Lake (F); the most-stressed is Milford Lake (F).

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All Lakes in Clay County

5 lakes · 1 graded, 4 not rated1 graded lake · 4 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicAccess
1FMilford LakeClayF1.6 ft610 µg/L35.3 µg/LNo recent samples✓ Public
NRWakefield Boat Ramp Milford LakeClayNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRNorth LakeClayNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTimber C Boat Ramp Milford LakeClayNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRStillwater LakeClayNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot 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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Source: EPA National Aquatic Resource Surveys, 2026.