Question 1

Cleanest Lakes in Iron County, Wisconsin?

Accepted Answer

Spider Lake in Iron County leads the rankings with a water quality grade of A and 27.9 ft of clarity. Below are the top 18 cleanest monitored lakes in Iron County, Wisconsin, ranked by EPA water quality score.

Question 2

What is the cleanest lake in Iron County, Wisconsin?

Accepted Answer

Spider Lake in Iron County is the highest-rated lake in Iron County, Wisconsin with an EPA water quality grade of A and 27.9 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	Spider Lake	Iron	A	27.9 ft	14.1 µg/L	-
2	Pine Lake	Iron	A	19.7 ft	17.8 µg/L	-
3	Fisher Lake	Iron	A	24.6 ft	16.7 µg/L	-
4	Cedar Lake	Iron	A	24.8 ft	18.3 µg/L	-
5	Charnley Lake	Iron	A	41 ft	11 µg/L	-
6	Lake of the Falls	Iron	A	16.4 ft	19.6 µg/L	-
7	Turtle Flambeau Flowage Lake	Iron	A	19.7 ft	19.7 µg/L	-
8	Mercer Lake	Iron	A	39 ft	16.5 µg/L	-
9	Wilson Lake	Iron	A	36.1 ft	14.1 µg/L	-
10	Grand Portage Lake	Iron	A	36.1 ft	11.9 µg/L	-
11	Long Lake 44-40e	Iron	A	18 ft	17.4 µg/L	-
12	Echo Lake	Iron	A	21.3 ft	19.3 µg/L	-
13	Little Pine Lake	Iron	A	24.6 ft	13.3 µg/L	-
14	Lake Dorothy	Iron	A	25.8 ft	16.9 µg/L	-
15	Rice Lake	Iron	A	16.4 ft	22.5 µg/L	-
16	Saxon Fall Flowage Lake	Iron	B	26.2 ft	42.6 µg/L	-
17	First Black Lake	Iron	B	8.2 ft	27.5 µg/L	-
18	Gile Flowage Lake	Iron	B	14.8 ft	30.6 µg/L	-

Cleanest Lakes in Iron County, Wisconsin

Ranked List

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