Hypereutrophic Lakes in Minnesota

193 hypereutrophic lakes in Minnesota. Very high nutrients, dense algae, poor clarity.

Hypereutrophic lakes (TSI above 70) are at the upper end of the productivity scale: visible algal blooms most weeks of summer, clarity often under 3 feet, and meaningful risk of harmful-algal-bloom toxin events. 193 hypereutrophic lakes are on the Minnesota books. Almost none of them are deep — 2% break 50 feet. Shallow basin plus heavy nutrient input is the consistent recipe.

Hypereutrophic lakes overwhelmingly grade D or F — the trophic class and the grade are measuring closely-related dimensions of the same underlying nutrient regime.

#	Lake	County	Grade	Clarity	Depth	TSI
1	Kramer Lake	Washington	D	1 ft	-	70
2	Ann Lake	Pope	D	7.2 ft	14 ft	71
3	Clear Lake	Martin	D	1 ft	7 ft	72
4	Star Lake	Meeker	D	1 ft	15 ft	71
5	Mud Lake	Otter Tail	D	1.3 ft	-	71
6	Unnamed Lake	Wright	D	1.3 ft	38 ft	70
7	Ann Lake	Wright	D	4 ft	18.5 ft	71
8	Spring Lake	Hennepin	D	3.4 ft	-	93
9	Brownie Lake	Hennepin	D	5 ft	47 ft	81
10	Dean Lake	Wright	D	4.3 ft	20 ft	72
11	Scotch Lake	Le Sueur	D	4.1 ft	11 ft	76
12	Swartout Lake	Wright	D	4.6 ft	-	74
13	Porter Lake	Blue Earth	D	1.3 ft	-	71
14	Winsted Lake	McLeod	D	3.3 ft	12 ft	76
15	Gorman Lake	Le Sueur	D	3.7 ft	14 ft	76
16	Cannon Lake	Rice	D	4.1 ft	15 ft	70
17	Mud Lake	Washington	F	1.2 ft	-	72
18	Rice Lake	Scott	F	1.7 ft	-	76
19	Victoria Lake	Hennepin	F	1.2 ft	-	71
20	Long Lake	Stearns	F	2.5 ft	35 ft	76
21	Long Lake	Cottonwood	F	1 ft	-	77
22	Long Lake	Dakota	F	1.6 ft	-	72
23	Jonathan Lake	Carver	F	1.5 ft	-	74
24	Peltier Lake	Anoka	F	2.5 ft	18 ft	77
25	Clear Lake	Brown	F	0.8 ft	8 ft	80
26	Clear Lake	Waseca	F	2.5 ft	34 ft	70
27	Clear Lake	Stevens	F	0.7 ft	-	85
28	Clear Lake	Le Sueur	F	1.2 ft	18 ft	81
29	Eagle Lake	Carver	F	2 ft	14 ft	73
30	Eagle Lake	Blue Earth	F	1 ft	9 ft	77
31	Fish Lake	Becker	F	1 ft	-	76
32	Allie Lake	Renville	F	3 ft	12 ft	71
33	Roberds Lake	Rice	F	2.5 ft	43 ft	76
34	Charlotte Lake	Stevens	F	0.9 ft	20 ft	81
35	Mud Lake	Hennepin	F	0.9 ft	-	77
36	Mud Lake	Hennepin	F	3 ft	-	71
37	Mud Lake	Martin	F	1.6 ft	19 ft	71
38	Pike Lake	Scott	F	2.3 ft	9 ft	72
39	Unnamed Lake	Meeker	F	0.7 ft	15 ft	83
40	Unnamed Lake	Benton	F	1.5 ft	-	71
41	Unnamed Lake	Becker	F	1.2 ft	-	75
42	Unnamed Lake	Swift	F	0.7 ft	-	83
43	Unnamed Lake	Watonwan	F	1 ft	-	81
44	Unnamed Lake	Otter Tail	F	1.3 ft	-	73
45	Unnamed Lake	Big Stone	F	2 ft	15 ft	81
46	Unnamed Lake	Stevens	F	1.1 ft	-	75
47	Unnamed Lake	Grant	F	0.7 ft	-	84
48	Unnamed Lake	Brown	F	0.3 ft	-	100
49	Unnamed Lake	Hennepin	F	-	-	82
50	Tetonka Lake	Le Sueur	F	3 ft	35 ft	73
51	Wakanda Lake	Kandiyohi	F	0.5 ft	-	87
52	Saint Johns Lake	Kandiyohi	F	0.5 ft	-	83
53	Wheeler North Lake	Kandiyohi	F	1 ft	-	82
54	Union Lake	Rice	F	3 ft	10 ft	84
55	Island Lake	Lyon	F	2 ft	8 ft	70
56	Rice Lake	Hennepin	F	2.3 ft	11.5 ft	77
57	Pokegama Lake	Pine	F	2 ft	25 ft	73
58	George Lake	Martin	F	2 ft	11 ft	71
59	Ox Yoke Lake	Hennepin	F	2.6 ft	-	77
60	Big Woods Lake	Carver	F	1.4 ft	-	76
61	Powderhorn Lake	Hennepin	F	1.5 ft	24 ft	74
62	Fountain Lake	Wright	F	1 ft	10 ft	76
63	Goose Lake	Ramsey	F	0.7 ft	6 ft	81
64	Goose Lake	Carver	F	1 ft	10 ft	76
65	Goose Lake	Goodhue	F	0.4 ft	5.7 ft	80
66	Goose Lake	Hennepin	F	0.8 ft	8 ft	77
67	Goose Lake	Washington	F	1.5 ft	-	71
68	Benton Lake	Carver	F	1 ft	-	77
69	Foster Lake	Wright	F	1.6 ft	10 ft	74
70	Silver Lake	Mille Lacs	F	1 ft	-	77
71	Typo Lake	Anoka	F	1 ft	6 ft	79
72	Crystal Lake	Blue Earth	F	1.5 ft	8 ft	75
73	Crystal Lake	Rice	F	-	-	83
74	Knife Lake	Kanabec	F	2 ft	15 ft	72
75	Diamond Lake	Hennepin	F	1.7 ft	8 ft	73
76	Ardmore Lake	Hennepin	F	1.3 ft	20 ft	81
77	Rebecca Lake	Dakota	F	2.6 ft	15 ft	71
78	Uhl Lake	Wright	F	1 ft	-	77
79	Cornelia Lake	Hennepin	F	0.8 ft	6.5 ft	77
80	Wood Lake	Yellow Medicine	F	3 ft	9 ft	72
81	Arvilla Lake	Meeker	F	1 ft	9 ft	76
82	Schultz Lake	Kandiyohi	F	1.3 ft	-	76
83	Alice Lake	Otter Tail	F	0.8 ft	-	87
84	Rose Lake	Washington	F	1.8 ft	11.3 ft	72
85	Vadnais Lake	Ramsey	F	1 ft	9 ft	73
86	Langdon Lake	Hennepin	F	1.5 ft	38 ft	71
87	Little Rock Lake	Benton	F	1.8 ft	17 ft	73
88	Circle Lake	Rice	F	1.5 ft	14 ft	82
89	Hanska Lake	Brown	F	1 ft	16 ft	80
90	Fox Lake	Martin	F	1 ft	20 ft	79
91	Fox Lake	Murray	F	0.6 ft	8.5 ft	83
92	Hazeltine Lake	Carver	F	1 ft	-	76
93	Cleary Lake	Scott	F	2.3 ft	9 ft	72
94	Loon Lake	Jackson	F	0.9 ft	8 ft	82
95	Sylvan Lake	Hennepin	F	1.2 ft	-	80
96	Cameron Lake	Polk	F	1 ft	9 ft	76
97	Miller Lake	Carver	F	1.6 ft	14 ft	76
98	Mcknight Lake	Carver	F	2.2 ft	-	71
99	Buffalo Lake	Murray	F	1.1 ft	8.5 ft	73
100	Wheeler South Lake	Kandiyohi	F	2 ft	-	71

All hypereutrophic 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.