Question 1

Cleanest Lakes in Mahnomen County, Minnesota?

Accepted Answer

Bass Lake in Mahnomen County leads the rankings with a water quality grade of A and 13.1 ft of clarity. Below are the top 16 cleanest monitored lakes in Mahnomen County, Minnesota, ranked by EPA water quality score.

Question 2

What is the cleanest lake in Mahnomen County, Minnesota?

Accepted Answer

Bass Lake in Mahnomen County is the highest-rated lake in Mahnomen County, Minnesota with an EPA water quality grade of A and 13.1 feet of water clarity.

Question 3

How are these rankings calculated?

Accepted Answer

Lakes are graded A through F using the Metropolitan Council methodology, which combines Secchi depth (water clarity), total phosphorus, and chlorophyll-a (algae) into a single score. Source data comes from the EPA Water Quality Portal.

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Bass Lake	Mahnomen	A	13.1 ft	10 µg/L	-
2	Mccraney Lake	Mahnomen	A	12.1 ft	19 µg/L	-
3	South Twin Lake	Mahnomen	A	10.2 ft	14 µg/L	-
4	Norris Lake	Mahnomen	A	11.6 ft	15 µg/L	-
5	North Twin Lake	Mahnomen	B	8.5 ft	17 µg/L	-
6	Sargent Lake	Mahnomen	B	8.9 ft	16 µg/L	-
7	Tulaby Lake	Mahnomen	B	7.5 ft	23.5 µg/L	-
8	Snider Lake	Mahnomen	B	8.5 ft	21 µg/L	-
9	Little Elbow Lake	Mahnomen	B	6.9 ft	21 µg/L	-
10	Roy Lake	Mahnomen	C	6 ft	24 µg/L	-
11	Lone Lake	Mahnomen	C	7.1 ft	48.5 µg/L	-
12	Unnamed Lake	Mahnomen	C	3.3 ft	23 µg/L	-
13	Island Lake	Mahnomen	C	6.4 ft	30 µg/L	-
14	Big Lake	Mahnomen	D	2.1 ft	33 µg/L	-
15	Unnamed Lake	Mahnomen	D	3.3 ft	60 µg/L	-
16	Beaulieu Lake	Mahnomen	F	1.3 ft	90 µg/L	-

Cleanest Lakes in Mahnomen County, Minnesota

Ranked List

More Answers for Mahnomen County, Minnesota