What are hypereutrophic lakes in Minnesota?

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

What does hypereutrophic mean?

Very high nutrients, dense algae, poor clarity.

Hypereutrophic Lakes in Minnesota

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. 124 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 carry the highest phosphorus and chlorophyll-a readings on record; the trophic class and the readings are measuring closely related dimensions of the same underlying nutrient regime.

#	Lake	County	Clarity	Depth	TSI
1	Union Lake	Rice	3 ft	10 ft	72
2	Rice Lake	Scott	1.7 ft	-	77
3	Scotch Lake	Le Sueur	2.6 ft	11 ft	71
4	Kansas Lake	Watonwan	1.5 ft	7 ft	71
5	Yankton Lake	Lyon	0.8 ft	8 ft	70
6	Gonz Lake	Wright	-	-	74
7	O'Leary Lake	Dakota	2.6 ft	33.5 ft	71
8	Mud Lake	Hennepin	0.9 ft	-	78
9	Mud Lake	Washington	1.2 ft	-	72
10	Mud Lake	Martin	1.6 ft	19 ft	71
11	Snelling Lake	Hennepin	1.8 ft	9.5 ft	71
12	Long Lake	Dakota	1.6 ft	-	72
13	Unnamed Lake	Meeker	0.7 ft	15 ft	80
14	Unnamed Lake	Hennepin	-	-	78
15	Jonathan Lake	Carver	1.6 ft	-	74
16	Peltier Lake	Anoka	2.5 ft	18 ft	74
17	Tetonka Lake	Le Sueur	3 ft	35 ft	72
18	Clear Lake	Meeker	3 ft	18 ft	70
19	Clear Lake	Brown	0.8 ft	8 ft	78
20	Clear Lake	Waseca	2.5 ft	34 ft	70
21	Clear Lake	Le Sueur	1.2 ft	18 ft	78
22	Clear Lake	Martin	1 ft	7 ft	71
23	Eagle Lake	Carver	2 ft	14 ft	73
24	Fish Lake	Becker	1 ft	-	76
25	Wheeler North Lake	Kandiyohi	1 ft	-	80
26	Roberds Lake	Rice	2.5 ft	43 ft	75
27	Charlotte Lake	Stevens	0.9 ft	20 ft	79
28	Emily Lake	Chisago	1.6 ft	-	71
29	Rice Lake	Hennepin	2.3 ft	11.5 ft	77
30	Pokegama Lake	Pine	2 ft	25 ft	71
31	George Lake	Martin	2 ft	11 ft	71
32	Big Woods Lake	Carver	1.5 ft	-	76
33	Goose Lake	Ramsey	0.7 ft	6 ft	80
34	Goose Lake	Carver	1.2 ft	10 ft	77
35	Goose Lake	Goodhue	0.4 ft	5.7 ft	80
36	Goose Lake	Hennepin	0.8 ft	8 ft	77
37	Goose Lake	Washington	1.5 ft	-	71
38	Typo Lake	Anoka	1 ft	6 ft	77
39	Powderhorn Lake	Hennepin	1.5 ft	24 ft	72
40	Fountain Lake	Wright	1 ft	10 ft	78
41	Crystal Lake	Blue Earth	1.5 ft	8 ft	73
42	Benton Lake	Carver	1 ft	-	77
43	Foster Lake	Wright	1.6 ft	10 ft	75
44	Knife Lake	Kanabec	2 ft	15 ft	73
45	Diamond Lake	Hennepin	1.7 ft	8 ft	73
46	Ardmore Lake	Hennepin	1.3 ft	20 ft	79
47	Francis Lake	Isanti	2 ft	7 ft	71
48	Rebecca Lake	Dakota	2.6 ft	15 ft	71
49	Schultz Lake	Kandiyohi	1.3 ft	-	76
50	Alice Lake	Otter Tail	0.8 ft	-	86
51	Arvilla Lake	Meeker	1 ft	9 ft	75
52	Vadnais Lake	Ramsey	1 ft	9 ft	74
53	Victoria Lake	Hennepin	1.2 ft	-	70
54	Rose Lake	Washington	1.8 ft	11.3 ft	72
55	Circle Lake	Rice	1.5 ft	14 ft	79
56	Little Rock Lake	Benton	1.8 ft	17 ft	74
57	Hanska Lake	Brown	1 ft	16 ft	78
58	Fox Lake	Martin	1 ft	20 ft	76
59	Fox Lake	Murray	0.6 ft	8.5 ft	78
60	Cleary Lake	Scott	2.3 ft	9 ft	72
61	Hazeltine Lake	Carver	1 ft	-	77
62	Loon Lake	Jackson	0.9 ft	8 ft	80
63	Sylvan Lake	Hennepin	1.2 ft	-	78
64	Cameron Lake	Polk	1 ft	9 ft	76
65	Miller Lake	Carver	1.6 ft	14 ft	76
66	Mcknight Lake	Carver	2.2 ft	-	71
67	Parley Lake	Carver	1.8 ft	18 ft	70
68	Spring Lake	Hennepin	3.4 ft	-	76
69	French Lake	Rice	1.7 ft	56 ft	71
70	Amber Lake	Martin	2 ft	19 ft	70
71	Swede Lake	Carver	2 ft	12 ft	72
72	Augusta Lake	Dakota	0.7 ft	-	79
73	Malmedal Lake	Pope	1.6 ft	10 ft	74
74	Simon Lake	Pope	1.3 ft	-	72
75	Dean Lake	Wright	4.3 ft	20 ft	70
76	Lower Orono Lake	Sherburne	2.5 ft	18 ft	71
77	Unn Pond	Dakota	2 ft	-	70
78	Uhlenkolts Lake	Stearns	0.7 ft	18 ft	82
79	Cottonwood Lake	Lyon	1.8 ft	7 ft	72
80	Wells Lake	Rice	2 ft	4 ft	72
81	Pearl Lake	Jackson	1 ft	6 ft	77
82	Mccarthy Lake	Dakota	1 ft	19 ft	79
83	Stay Lake	Lincoln	1 ft	6 ft	74
84	East Toqua Lake	Big Stone	1.6 ft	9 ft	78
85	Indian Lake	Nobles	2.5 ft	6 ft	72
86	Maria Lake	Carver	0.8 ft	6 ft	86
87	Shakopee Lake	Chippewa	1.5 ft	-	79
88	Millstone Lake	Wright	0.8 ft	8.5 ft	77
89	Little Mary Lake	Wright	1.5 ft	-	74
90	Upper Sakatah Lake	Le Sueur	3 ft	12 ft	74
91	Albion Lake	Wright	1 ft	-	75
92	Wilhelm Lake	Wright	2 ft	-	71
93	Split Rock Reservoir	Pipestone	1.3 ft	16 ft	75
94	Little Waverly Lake	Wright	1.5 ft	12 ft	80
95	Northwood Lake	Hennepin	1.5 ft	-	75
96	Swartout Lake	Wright	4.6 ft	-	73
97	Henshaw Lake	Wright	1 ft	8 ft	74
98	Byllesby Lake	Dakota	3 ft	50 ft	70
99	Ocheda Lake	Nobles	1.6 ft	5 ft	76
100	Cowley Lake	Hennepin	0.8 ft	-	89

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 →Ontario version →Québec version →Nova Scotia version →British Columbia version →Newfoundland and Labrador version →All Minnesota lakes →

Source: EPA National Aquatic Resource Surveys, 2026.