What is the cleanest lake in Winneshiek County, Iowa?

Lake Meyer in Winneshiek County is the highest-rated lake in Winneshiek County, Iowa with an EPA water quality grade of D and 3.1 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 Winneshiek County, Iowa

Lake Meyer in Winneshiek County leads the rankings with a water quality grade of D and 3.1 ft of clarity. Below are the top 1 cleanest monitored lakes in Winneshiek County, Iowa, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Lake Meyer	Winneshiek	D	3.1 ft	49 µg/L	28.5 µg/L

Ranked List

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