What is the cleanest lake in Bowman County, North Dakota?

Bowman-Haley Dam Lake in Bowman County is the highest-rated lake in Bowman County, North Dakota with an EPA water quality grade of D and 3.9 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.

Cleanest Lakes in Bowman County, North Dakota

Bowman-Haley Dam Lake in Bowman County leads the rankings with a water quality grade of D and 3.9 ft of clarity. Below are the top 3 cleanest monitored lakes in Bowman County, North Dakota, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Bowman-Haley Dam Lake	Bowman	D	3.9 ft	96.5 µg/L	13.2 µg/L
2	Buffalo Springs Lake	Bowman	NR	-	-	-
3	Spring Lake	Bowman	NR	-	-	-

Ranked List

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