What is the cleanest lake in Custer County, Colorado?

Deweese Reservoir in Custer County is the highest-rated lake in Custer County, Colorado with an EPA water quality grade of D and 5.2 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 Custer County, Colorado

Deweese Reservoir in Custer County leads the rankings with a water quality grade of D and 5.2 ft of clarity. Below are the top 2 cleanest monitored lakes in Custer County, Colorado, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Deweese Reservoir	Custer	D	5.2 ft	41.5 µg/L	13.5 µg/L
2	Brush Creek Lakes	Custer	NR	-	-	-

Ranked List

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