What is the cleanest lake in Shelby County, Iowa?

Manteno Lake in Shelby County is the highest-rated lake in Shelby County, Iowa with an EPA water quality grade of D and 2.7 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 Shelby County, Iowa

Manteno Lake in Shelby County leads the rankings with a water quality grade of D and 2.7 ft of clarity. Below are the top 2 cleanest monitored lakes in Shelby County, Iowa, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Manteno Lake	Shelby	D	2.7 ft	138.5 µg/L	28.3 µg/L
2	Prairie Rose Lake	Shelby	F	1.6 ft	159 µg/L	73.6 µg/L

Ranked List

More Answers for Shelby County, Iowa