What is the cleanest lake in Big Horn County, Montana?

Arapooish Pond in Big Horn County has the cleanest nutrient and algae readings in Big Horn County, Montana.

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 Big Horn County, Montana

Arapooish Pond in Big Horn County leads the rankings on measured clarity and nutrients. Below are the top 3 cleanest monitored lakes in Big Horn County, Montana, ranked on EPA nutrient and algae measurements.

Ranked List

#	Lake	County	Clarity	Phosphorus	Algae
1	Arapooish Pond	Big Horn	-	-	-
2	Lodge Grass Storage Reservoir	Big Horn	-	-	-
3	Tongue River Reservoir	Big Horn	-	-	-

Ranked List

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