What is the cleanest lake in Day County, South Dakota?

Sweetwater Lake in Day County has the cleanest nutrient and algae readings in Day County, South Dakota.

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 Day County, South Dakota

Sweetwater Lake in Day County leads the rankings on measured clarity and nutrients. Below are the top 22 cleanest monitored lakes in Day County, South Dakota, ranked on EPA nutrient and algae measurements.

Ranked List

#	Lake	County	Clarity	Phosphorus	Algae
1	Sweetwater Lake	Day	-	-	-
2	Bitter Lake	Day	-	-	-
3	Holmquist Slough	Day	-	-	-
4	Hazelden Lake	Day	-	-	-
5	Stangland Slough	Day	-	-	-
6	Goose Lake	Day	-	-	-
7	Phragmites Pond	Day	-	-	-
8	Swan Pond	Day	-	-	-
9	Spring Lake	Day	-	-	-
10	Hillebrands Lake	Day	-	-	-
11	Campbell Slough	Day	-	-	-
12	Anderson Lake	Day	-	-	-
13	Headman Slough	Day	-	-	-
14	Dahling Slough	Day	-	-	-
15	Little Rush Lake	Day	-	-	-
16	Buchner Slough	Day	-	-	-
17	Antelope Lake	Day	-	-	-
18	Solomon Slough	Day	-	-	-
19	Goose Lake	Day	-	-	-
20	Foldager Slough	Day	-	-	-
21	Arneson Slough	Day	-	-	-
22	Mud Lake	Day	-	-	-

Ranked List

More Answers for Day County, South Dakota