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

Lawrence County Lake Quality

Arkansas, 9 lakes, average grade F (Algae-prone)

Lawrence County has 9 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. 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.

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. Lake Charles (F) is the cleanest in the county.

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All Lakes in Lawrence County

9 lakes · 1 graded, 8 not rated1 graded lake · 8 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicAccess
1FLake CharlesLawrenceFNo recent samples69.5 µg/L40.9 µg/LNo recent samples✓ Public
NRHorner BayLawrenceNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPortia BayLawrenceNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCooper Creek Site Two ReservoirLawrenceNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPhillips LakeLawrenceNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFlat Creek Site Six ReservoirLawrenceNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRobinson BayLawrenceNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBrushy LakeLawrenceNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHorseshoe LakeLawrenceNRNo 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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See how Lawrence 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.