What is the cleanest lake in Clinton County, Illinois?

Long Lake in Clinton County has the cleanest nutrient and algae readings in Clinton County, Illinois.

How are these rankings calculated?

Nutrients and algae, total phosphorus, nitrogen, chlorophyll-a and turbidity, are read against EPA National Lakes Assessment 2022 condition classes for that lake’s ecoregion. Water clarity (Secchi depth) is measured and shown separately. Lakes without enough recent samples are listed without a condition class rather than ranked low. Source data comes from the EPA Water Quality Portal.

Cleanest Lakes in Clinton County, Illinois

Long Lake in Clinton County leads the rankings on measured clarity and nutrients. Below are the top 2 cleanest monitored lakes in Clinton County, Illinois, ranked on EPA nutrient and algae measurements.

Ranked List

#	Lake	County	Clarity	Phosphorus	Algae
1	Long Lake	Clinton	-	-	-
2	Big Forked Lake	Clinton	-	-	-

Ranked List

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