What is the cleanest lake in Cimarron County, Oklahoma?

Willow Bar Lake in Cimarron County is the highest-rated lake in Cimarron 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 Cimarron County, Oklahoma

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

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Willow Bar Lake	Cimarron	NR	-	-	-
2	Sampsel Lake	Cimarron	NR	-	-	-
3	Lafaver Lake	Cimarron	NR	-	-	-

Ranked List

More Answers for Cimarron County, Oklahoma