What is the cleanest lake in Okmulgee County, Oklahoma?

Okmulgee Lake in Okmulgee County is the highest-rated lake in Okmulgee County, Oklahoma with an EPA water quality grade of NR.

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 Okmulgee County, Oklahoma

Okmulgee Lake in Okmulgee County leads the rankings with a water quality grade of NR. Below are the top 3 cleanest monitored lakes in Okmulgee County, Oklahoma, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Okmulgee Lake	Okmulgee	NR	-	-	-
2	Morris Lake	Okmulgee	NR	-	-	-
3	Flag Lake	Okmulgee	NR	-	-	-

Ranked List

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