What is the cleanest lake in Itasca County, Minnesota?

Shallow Lake in Itasca County is the highest-rated lake in Itasca County, Minnesota with an EPA water quality grade of A and 16.4 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 Itasca County, Minnesota

Shallow Lake in Itasca County leads the rankings with a water quality grade of A and 16.4 ft of clarity. Below are the top 50 cleanest monitored lakes in Itasca County, Minnesota, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Shallow Lake	Itasca	A	16.4 ft	9 µg/L	3.2 µg/L
2	Deer Lake	Itasca	A	8.9 ft	16 µg/L	5.5 µg/L
3	Deer Lake	Itasca	A	13.1 ft	11 µg/L	2.1 µg/L
4	Five Island Lake	Itasca	A	13 ft	12 µg/L	3.2 µg/L
5	Sand Lake	Itasca	A	13.2 ft	18 µg/L	3.1 µg/L
6	Moose Lake	Itasca	A	8 ft	24 µg/L	5.1 µg/L
7	Turtle Lake	Itasca	A	17.1 ft	8 µg/L	2.1 µg/L
8	Pokegama Lake	Itasca	A	16.1 ft	12 µg/L	2.3 µg/L
9	Swan Lake	Itasca	A	13.5 ft	18 µg/L	5.2 µg/L
10	Mirror Lake	Itasca	A	18 ft	11 µg/L	1.7 µg/L
11	Siseebakwet Lake	Itasca	A	19 ft	5 µg/L	1.3 µg/L
12	Battle Lake	Itasca	A	8.2 ft	15 µg/L	4.1 µg/L
13	Johnson Lake	Itasca	A	15.7 ft	9.5 µg/L	2.7 µg/L
14	South Sugar Lake	Itasca	A	14.4 ft	15 µg/L	3.6 µg/L
15	Jack the Horse Lake	Itasca	A	11.6 ft	13.5 µg/L	2.1 µg/L
16	Ball Club Lake	Itasca	B	16 ft	16.5 µg/L	-
17	Pickerel Lake	Itasca	C	10.2 ft	17.5 µg/L	8 µg/L
18	Jessie Lake	Itasca	C	8.5 ft	30 µg/L	12.5 µg/L
19	Little Sand Lake	Itasca	C	8.2 ft	29.5 µg/L	11.4 µg/L
20	Sugar Lake	Itasca	C	8.4 ft	18 µg/L	4.9 µg/L
21	Bowstring Lake	Itasca	C	8 ft	38.5 µg/L	12.5 µg/L
22	Dunbar Lake	Itasca	C	4.9 ft	35.5 µg/L	14.3 µg/L
23	Cut Foot Sioux Lake	Itasca	C	8.5 ft	26.5 µg/L	6.2 µg/L
24	Third River Flowage Lake	Itasca	C	6.9 ft	28.5 µg/L	5.5 µg/L
25	King Lake	Itasca	D	4.5 ft	35 µg/L	29 µg/L
26	Lower Pigeon Lake	Itasca	D	4.2 ft	38 µg/L	27.6 µg/L
27	Middle Pigeon Lake	Itasca	D	7.5 ft	27 µg/L	15.5 µg/L
28	Dixon Lake	Itasca	D	6 ft	34 µg/L	19.6 µg/L
29	Round Lake	Itasca	F	4.1 ft	67 µg/L	31.8 µg/L
30	Bengal Lake	Itasca	NR	-	-	-
31	Hay Lake	Itasca	NR	-	-	-
32	Moose Lake	Itasca	NR	-	-	-
33	Nameless Lake	Itasca	NR	-	-	-
34	Little Fowler Lake	Itasca	NR	-	-	-
35	Little Island Lake	Itasca	NR	-	-	-
36	Long Lake	Itasca	NR	-	-	-
37	Cropless Lake	Itasca	NR	-	-	-
38	Beauty Lake	Itasca	NR	-	-	-
39	Mary Lake	Itasca	NR	-	-	-
40	Twin Lake	Itasca	NR	-	-	-
41	Rosholt Lake	Itasca	NR	-	-	-
42	New Lake	Itasca	NR	-	-	-
43	Sand Lake	Itasca	NR	-	-	-
44	Loon Lake	Itasca	NR	-	-	-
45	Bass Lake	Itasca	NR	-	-	-
46	Lammon Aid Lake	Itasca	NR	-	-	-
47	Hart Lake	Itasca	NR	-	-	-
48	Little O'Brien Lake	Itasca	NR	-	-	-
49	Ox Hide Lake	Itasca	NR	-	-	-
50	Snowball Lake	Itasca	NR	-	-	-

Ranked List

More Answers for Itasca County, Minnesota