Question 1

Cleanest Lakes in Grant County, South Dakota?

Accepted Answer

Twin Lakes in Grant County leads the rankings on measured clarity and nutrients. Below are the top 6 cleanest monitored lakes in Grant County, South Dakota, ranked on EPA nutrient and algae measurements.

Question 2

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

Accepted Answer

Twin Lakes in Grant County has the cleanest nutrient and algae readings in Grant County, South Dakota.

Question 3

How are these rankings calculated?

Accepted Answer

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 Grant County, South Dakota

Ranked List

More Answers for Grant County, South Dakota

#	Lake	County	Clarity	Phosphorus	Algae
1	Twin Lakes	Grant	-	-	-
2	Lonesome Lake	Grant	-	-	-
3	Myers Lake	Grant	-	-	-
4	Mud Lake	Grant	-	-	-
5	Pyror Slough	Grant	-	-	-
6	Crooked Lake	Grant	-	-	-