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

Lincoln County Lake Quality

Missouri, 7 lakes, average grade B (Good)

Lincoln County holds 7 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. 2 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.

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. Lincoln Lake (A) is the cleanest in the county.

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All Lakes in Lincoln County

7 lakes · 2 graded, 5 not rated2 graded lakes · 5 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicAccess
1ALincoln LakeLincolnA5.7 ft12.7 µg/L3.6 µg/LNo recent samplesNot recorded
2CWhiteside LakeLincolnC3.3 ft26 µg/L14.7 µg/LNo recent samples✓ Public
NRTremell SloughLincolnNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRKings LakeLincolnNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHorseshoe LakeLincolnNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDogfish SloughLincolnNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHorseshoe LakeLincolnNRNo 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.