What is the cleanest lake in Twin Falls County, Idaho?

Deep Creek Reservoir in Twin Falls County is the highest-rated lake in Twin Falls County, Idaho with an EPA water quality grade of NR.

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 Twin Falls County, Idaho

Deep Creek Reservoir in Twin Falls County leads the rankings with a water quality grade of NR. Below are the top 6 cleanest monitored lakes in Twin Falls County, Idaho, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Deep Creek Reservoir	Twin Falls	NR	-	-	-
2	Salmon Falls Creek Reservoir	Twin Falls	NR	-	-	-
3	Dierkes Lake	Twin Falls	NR	-	-	-
4	Murtaugh Lake	Twin Falls	NR	-	-	-
5	Milner Lake	Twin Falls	NR	-	-	-
6	Williams Reservoir	Twin Falls	NR	-	-	-

Ranked List

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