What is the cleanest lake in Arkansas?

Beaver Lake in Carroll County is the highest-rated lake in Arkansas with an EPA water quality grade of A and 20.3 feet of water clarity.

How are these rankings calculated?

Lakes are graded A through F on nutrients and algae — total phosphorus, nitrogen, chlorophyll-a, and turbidity — against EPA National Lakes Assessment 2022 condition classes for that lake’s ecoregion. Water clarity (Secchi depth) is measured and shown; it is not the letter. Lakes without enough recent samples are UNRATED, not given an F. Source data comes from the EPA Water Quality Portal.

Safest Lakes to Swim In in Arkansas

2 lakes in Arkansas qualify as safest for swimming, all hold grade A or B and report chlorophyll-a (algae) under 10 µg/L. Always check local advisories on the day you swim.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Beaver Lake	Carroll	A	20.3 ft	5 µg/L	1.2 µg/L
2	Lake Winona	Saline	A	7.2 ft	11 µg/L	2.1 µg/L

Ranked List

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