What is the cleanest lake in Harlan County, Kentucky?

Herb Smith Lake in Harlan County is the highest-rated lake in Harlan County, Kentucky with an EPA water quality grade of C.

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.

Cleanest Lakes in Harlan County, Kentucky

Herb Smith Lake in Harlan County leads the rankings with a water quality grade of C. Below are the top 2 cleanest monitored lakes in Harlan County, Kentucky, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Herb Smith Lake	Harlan	C	-	30 µg/L	-
2	Martins Fork Lake	Harlan	NR	-	-	-

Ranked List

More Answers for Harlan County, Kentucky