What is the cleanest lake in Lake of the Woods County, Minnesota?

Big Traverse Bay Lake in Lake of the Woods County is the highest-rated lake in Lake of the Woods County, Minnesota with an EPA water quality grade of C and 4 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 Lake of the Woods County, Minnesota

Big Traverse Bay Lake in Lake of the Woods County leads the rankings with a water quality grade of C and 4 ft of clarity. Below are the top 4 cleanest monitored lakes in Lake of the Woods County, Minnesota, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Big Traverse Bay Lake	Lake of the Woods	C	4 ft	33.5 µg/L	13.7 µg/L
2	Low Lake	Lake of the Woods	C	5.4 ft	28 µg/L	8.8 µg/L
3	Winter Road Lake	Lake of the Woods	NR	-	-	-
4	Lost Lake	Lake of the Woods	NR	-	-	-

Ranked List

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