Mesotrophic Lakes in Minnesota

906 mesotrophic lakes in Minnesota. Moderate nutrients, good water quality.

Most well-managed working lakes register as mesotrophic — the band that balances productivity with clarity. 906 lakes in Minnesota sit in the mesotrophic band. About 28% are deep (50+ ft); the rest are shallower basins where watershed management keeps nutrients from pushing the system into eutrophy.

Mesotrophic lakes tend to grade B or C on the LakeGrade rubric — the productive-but-clear band lines up with the middle of the letter grades.

#	Lake	County	Grade	Clarity	Depth	TSI
1	North Long Lake	Crow Wing	A	15.1 ft	97 ft	40
2	Clear Lake	Aitkin	A	15 ft	24 ft	41
3	Upper Maple Lake	Wright	A	17.2 ft	76 ft	41
4	Birch Lake	Wright	A	15 ft	52 ft	42
5	Little Toad Lake	Becker	A	15 ft	65 ft	42
6	Pelican Lake	Otter Tail	A	16.4 ft	55 ft	40
7	Alexander Lake	Morrison	A	16.5 ft	64 ft	40
8	Gull Lake	Cass	A	15 ft	80 ft	40
9	Union Lake	Polk	A	15 ft	-	40
10	Andrusia Lake	Beltrami	A	15.1 ft	60 ft	40
11	Island Lake	Becker	A	15 ft	38 ft	42
12	Island Lake	Crow Wing	A	-	36 ft	44
13	Mukooda Lake	St. Louis	A	16.6 ft	78 ft	41
14	George Lake	Kandiyohi	A	15 ft	34 ft	40
15	Brickyard Lake	Carver	A	15 ft	43 ft	41
16	Little Bass Lake	Clearwater	A	-	35 ft	43
17	Miltona Lake	Douglas	A	18.7 ft	105 ft	40
18	Pine Lake	Morrison	A	15.1 ft	59 ft	40
19	Pine Lake	Cass	A	16 ft	25 ft	40
20	Ember Lake	Wright	A	15.1 ft	45 ft	41
21	Midge Lake	Hubbard	A	18 ft	24 ft	41
22	Rose Lake	St. Louis	A	-	31 ft	45
23	Lougee Lake	Crow Wing	A	16.1 ft	53 ft	42
24	Clamshell Lake	Crow Wing	A	15.1 ft	44 ft	41
25	Bad Axe Lake	Hubbard	A	15.1 ft	39 ft	41
26	Lottie Lake	Douglas	A	16.1 ft	31 ft	40
27	Edward Lake	Crow Wing	A	15.5 ft	75 ft	40
28	Grass Lake	Ramsey	A	-	-	42
29	East Boot Lake	Washington	A	15 ft	27 ft	41
30	Cass Lake Allens Bay	Beltrami	A	16.6 ft	120 ft	41
31	Barnesville Lake	Clay	A	-	17 ft	45
32	Laxon Lake	Beltrami	A	-	-	42
33	Little Sandy Lake	St. Louis	A	-	-	47
34	Cabin Lake	Lake	A	-	3 ft	43
35	Cramer Lake	Lake	A	-	4 ft	42
36	First Silver Lake	Otter Tail	A	-	43 ft	44
37	Twin Lake	Washington	A	13 ft	-	41
38	Clear Lake	Washington	A	14 ft	27 ft	42
39	Big Lake	Carlton	A	10 ft	25 ft	42
40	Crooked Lake	Cass	A	12 ft	74 ft	42
41	Minnewashta Lake	Carver	A	11.5 ft	70 ft	41
42	Ames Lake	Itasca	A	10 ft	51 ft	42
43	Lac Lavon Lake	Dakota	A	12.1 ft	32 ft	41
44	Big Carnelian Lake	Washington	A	14.5 ft	66 ft	41
45	O'Brien Lake	Dakota	A	18 ft	-	43
46	Steamboat Lake	Cass	A	12 ft	93 ft	41
47	Taylor Lake Deep	Cook	A	10.6 ft	-	42
48	Trout Lake Deep	Cook	A	10.7 ft	-	42
49	Boxell Lake	Cass	A	14.5 ft	27 ft	41
50	Bush Lake	Hennepin	A	13 ft	28 ft	41
51	Jane Lake	Washington	A	13 ft	39 ft	43
52	Olson Lake	Washington	A	11.2 ft	15 ft	42
53	Mays Lake	Washington	A	11 ft	25 ft	44
54	West Boot Lake	Washington	A	14 ft	34 ft	40
55	Round Lake	Crow Wing	A	13.5 ft	51 ft	42
56	Round Lake	Otter Tail	A	11.2 ft	24 ft	44
57	Round Lake	Becker	A	10 ft	69 ft	44
58	Whitefish Lake	Crow Wing	A	14.4 ft	138 ft	40
59	Whitefish Lake	Beltrami	A	12.5 ft	30 ft	42
60	Long Lake	Stearns	A	13.5 ft	28 ft	43
61	Long Lake	Kandiyohi	A	10.5 ft	46 ft	42
62	Long Lake	Otter Tail	A	12.1 ft	88 ft	44
63	Long Lake	Beltrami	A	10 ft	83 ft	44
64	Long Lake	Otter Tail	A	11.6 ft	73 ft	43
65	Detroit Lake	Becker	A	14 ft	89 ft	42
66	Chippewa Lake	Douglas	A	14.8 ft	95 ft	40
67	Sullivan Lake	Morrison	A	10.8 ft	57 ft	43
68	Eagle Lake	Hubbard	A	11.2 ft	77 ft	43
69	Ida Lake	Wright	A	13.1 ft	60 ft	41
70	Fish Lake	Le Sueur	A	11.8 ft	55 ft	44
71	Little Pine Lake	Crow Wing	A	10 ft	36 ft	45
72	Grace Lake	Beltrami	A	15 ft	42 ft	43
73	Bass Lake	Crow Wing	A	13 ft	27 ft	43
74	Bass Lake	Becker	A	12.8 ft	48 ft	41
75	Bass Lake	Becker	A	11.2 ft	50 ft	41
76	Cedar Lake	Aitkin	A	11.1 ft	105 ft	42
77	East Loon Lake	Otter Tail	A	13.5 ft	105 ft	40
78	Clearwater Lake	Crow Wing	A	13 ft	54 ft	40
79	Clearwater Lake	Clearwater	A	10 ft	65 ft	44
80	Little Birch Lake	Todd	A	13 ft	89 ft	43
81	Maple Lake	Cass	A	13.3 ft	45 ft	40
82	Maple Lake	Douglas	A	14.1 ft	78 ft	41
83	Deer Lake	Beltrami	A	11 ft	42 ft	43
84	Deer Lake	Hubbard	A	12.8 ft	-	40
85	Five Island Lake	Itasca	A	13 ft	33 ft	40
86	Big Spunk Lake	Stearns	A	10 ft	38 ft	43
87	Marion Lake	Otter Tail	A	11 ft	62 ft	44
88	Darling Lake	Douglas	A	14 ft	62 ft	43
89	Mantrap Lake	Hubbard	A	12 ft	-	43
90	Sand Lake	Itasca	A	13.2 ft	60 ft	43
91	Green Lake	Kandiyohi	A	14.1 ft	110 ft	41
92	Island Lake	Hubbard	A	10.5 ft	65 ft	44
93	Island Lake	Clearwater	A	14.1 ft	58 ft	41
94	Portage Lake	Crow Wing	A	11.5 ft	37 ft	42
95	Turtle Lake	Beltrami	A	10.2 ft	45 ft	43
96	Spider Lake	Cass	A	10.2 ft	17 ft	42
97	Mitchell Lake	Sherburne	A	10 ft	33 ft	43
98	Sandy Lake	Beltrami	A	14 ft	32 ft	42
99	Pickerel Lake	Hubbard	A	11.1 ft	26 ft	42
100	Pickerel Lake	Itasca	A	10.2 ft	70 ft	45

All mesotrophic 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.