Eutrophic Lakes in Minnesota

849 eutrophic lakes in Minnesota. High nutrients, frequent algae, reduced clarity.

A eutrophic lake is a productive ecosystem with the trade-offs that come with productivity: more food at the base of the food web, more clarity reduction by mid-summer, more dissolved-oxygen variability near the bottom. 849 Minnesota lakes register as eutrophic. Only 10% are deep — eutrophy correlates with shallowness, agricultural watersheds, and the kind of nutrient-input history that takes decades to shift.

Eutrophic lakes typically grade C or D on the LakeGrade rubric. The same nutrient richness that defines the trophic class drives the lower grade.

#	Lake	County	Grade	Clarity	Depth	TSI
1	Stone Lake	St. Louis	B	-	-	51
2	Kettle Lake	Carlton	B	-	-	53
3	Winkle Lake	St. Louis	B	-	-	51
4	Erie Lake	Meeker	B	-	34 ft	51
5	Campers Lake	Lake	B	-	2.5 ft	51
6	Lemay Lake	Dakota	B	6.9 ft	15.5 ft	52
7	Fish Lake	Washington	B	5 ft	-	50
8	Jessie Lake	Beltrami	B	4.6 ft	35 ft	50
9	Chevans Lake Deep	Cook	B	1.9 ft	-	53
10	Horseshoe Lake	Isanti	B	3.5 ft	-	50
11	Big Lake	Stearns	B	6.9 ft	42 ft	50
12	Blackhawk Lake	Dakota	B	7.5 ft	12 ft	50
13	Arrowhead Lake	Crow Wing	B	6.9 ft	13 ft	50
14	Sand Hill Lake	Polk	B	6.9 ft	17 ft	50
15	Elbow Lake	Cook	B	3.7 ft	9 ft	52
16	Upper Twin Lake	Hubbard	B	6.9 ft	12 ft	50
17	Toad Lake	Becker	B	7 ft	29 ft	50
18	Sarah Lake	Polk	B	7.7 ft	27 ft	50
19	Hoffman Lake	Isanti	B	3.7 ft	-	51
20	Minerva Lake	Clearwater	B	7 ft	16 ft	50
21	Beseau Lake	Becker	B	7.7 ft	27 ft	50
22	Horseleg Lake	Isanti	B	3.6 ft	-	52
23	Waverly Lake	Wright	B	6.9 ft	70.5 ft	51
24	Shoepack Lake	St. Louis	B	4.6 ft	24 ft	51
25	Kittleson Lake	Polk	B	7.1 ft	-	50
26	Magda Lake	Hennepin	B	14.1 ft	-	51
27	Blackbird Lake	Becker	B	7.5 ft	-	50
28	Beaver Hut Lake	Lake	B	3.4 ft	12 ft	53
29	West Sturgeon Lake	Itasca	B	4.1 ft	31 ft	51
30	Little Wolf Lake	Cass	B	7 ft	24 ft	50
31	Iron Lake	Cook	B	4.9 ft	19 ft	50
32	Middle Mcdougal Lake	Lake	B	3.6 ft	7 ft	51
33	Little Iron Lake	Cook	B	4.2 ft	18 ft	51
34	Central Mystic Lake	Scott	B	-	-	55
35	Horseshoe Lake	Chisago	C	4.6 ft	53 ft	53
36	Bass Lake	Washington	C	6.5 ft	-	51
37	Schram Lake	Beltrami	C	3.9 ft	-	51
38	Green Lake	Chisago	C	6 ft	32 ft	51
39	Crystal Lake	Dakota	C	7 ft	37 ft	52
40	O'Dowd Lake	Scott	C	5.5 ft	22 ft	51
41	Simian Lake	St. Louis	C	3.9 ft	-	52
42	Spruce Lake	Carlton	C	2.3 ft	-	55
43	Rice Portage Lake	Carlton	C	1.3 ft	-	57
44	Middle Pigeon Lake	Itasca	C	7.5 ft	-	53
45	Westwood Lake	Hennepin	C	5.6 ft	-	52
46	Teal Lake Deep	Cook	C	3.3 ft	-	50
47	Hornbean Lake	Dakota	C	7.2 ft	-	51
48	Jellums Lake	Washington	C	6 ft	-	52
49	Round Lake	Hennepin	C	6.6 ft	37 ft	54
50	Round Lake	Ramsey	C	8 ft	-	54
51	Long Lake	Meeker	C	7.5 ft	28 ft	51
52	Medicine Lake	Hennepin	C	7.9 ft	49 ft	55
53	Twin Lake	Ramsey	C	7.5 ft	33 ft	52
54	Bryant Lake	Hennepin	C	9.8 ft	45 ft	50
55	One Pine Lake	St. Louis	C	4.5 ft	13 ft	53
56	Fish Lake	Dakota	C	7.2 ft	33.5 ft	53
57	Battle Creek Lake	Washington	C	7.2 ft	15.3 ft	55
58	Birch Lake	St. Louis	C	3.9 ft	25 ft	53
59	Bass Lake	Otter Tail	C	8.5 ft	36 ft	52
60	Mud Lake	Wright	C	5.6 ft	65 ft	52
61	Unnamed Lake	Dakota	C	6 ft	-	53
62	Unnamed Lake	St. Louis	C	4.8 ft	7 ft	53
63	Unnamed Lake	Otter Tail	C	3.9 ft	-	54
64	Blue Lake	Isanti	C	8.9 ft	31 ft	52
65	Sand Lake	Carlton	C	5 ft	27 ft	53
66	Sand Lake	Lake	C	4.1 ft	11 ft	53
67	Beaver Lake	Ramsey	C	7.7 ft	11 ft	53
68	Union Lake	Wright	C	5.5 ft	35 ft	51
69	Island Lake	Carlton	C	5.1 ft	22 ft	52
70	Island Lake	Itasca	C	8.9 ft	35 ft	50
71	Portage Lake	Hubbard	C	5.5 ft	17 ft	53
72	White Iron Lake	Lake	C	4.5 ft	47 ft	51
73	Koronis Lake	Stearns	C	6 ft	132 ft	51
74	Comfort Lake	Chisago	C	6 ft	47 ft	54
75	Minnewawa Lake	Aitkin	C	5 ft	21 ft	52
76	Goose Lake	Chisago	C	4.5 ft	55 ft	54
77	Mary Lake	Crow Wing	C	4.9 ft	34 ft	51
78	Big Sandy Lake	Aitkin	C	4.5 ft	84 ft	54
79	Coon Lake	Anoka	C	5.7 ft	27 ft	51
80	Gem Lake	Ramsey	C	6.9 ft	-	53
81	Lower Mission Lake	Crow Wing	C	6.9 ft	27 ft	53
82	Thomas Lake	Dakota	C	5.6 ft	8 ft	52
83	Silver Lake	Ramsey	C	7 ft	18 ft	55
84	Phalen Lake	Ramsey	C	8.1 ft	91 ft	51
85	Roy Lake	Mahnomen	C	6 ft	16 ft	51
86	Rock Lake	Cass	C	5.9 ft	17 ft	52
87	Rice Marsh Lake	Hennepin	C	7.7 ft	-	53
88	Crystal Lake	Scott	C	6.8 ft	26 ft	55
89	Jessie Lake	Douglas	C	6.8 ft	26 ft	54
90	Upper Cormorant Lake	Becker	C	8 ft	29 ft	50
91	Mcdonough Lake	Dakota	C	4.5 ft	13 ft	53
92	Fall Lake	Lake	C	5.5 ft	32 ft	50
93	Perch Lake	Carlton	C	2.2 ft	-	55
94	Perch Lake	Lincoln	C	9.3 ft	16.2 ft	54
95	Lower Twin Lake	Wadena	C	6.9 ft	26 ft	52
96	Pine Lake	Aitkin	C	6.5 ft	28 ft	53
97	East Twin Lake	St. Louis	C	4.9 ft	22 ft	51
98	Wolf Lake	Becker	C	3.9 ft	16 ft	54
99	Cedar Island Lake	St. Louis	C	3.8 ft	-	53
100	Chisago Lake	Chisago	C	4 ft	34 ft	54

All eutrophic lakes →Wisconsin version →Illinois version →Michigan version →Iowa version →Ohio version →Pennsylvania version →New York version →Missouri version →Indiana version →North Dakota version →South Dakota version →Florida version →Colorado version →North Carolina version →Vermont version →Texas version →Oregon version →Arkansas version →Oklahoma version →Kansas version →Nebraska version →Nevada version →Arizona version →Idaho version →Montana version →New Mexico version →Tennessee version →Alabama version →Virginia version →Kentucky version →Utah version →Washington version →Wyoming version →Georgia version →Massachusetts version →All Minnesota lakes →

Source: EPA National Aquatic Resource Surveys, 2026.