Mesotrophic Lakes in Minnesota

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

Most well-managed working lakes register as mesotrophic — the band that balances productivity with clarity. 851 lakes in Minnesota sit in the mesotrophic band. About 0% 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	Pelican Lake	Otter Tail	A	16.1 ft	-	40
2	Birch Lake	Wright	A	15 ft	-	42
3	Whitefish Lake	Crow Wing	A	15.1 ft	-	40
4	Chippewa Lake	Douglas	A	15.1 ft	-	40
5	Little Toad Lake	Becker	A	15 ft	-	42
6	Island Lake	Crow Wing	A	-	-	44
7	Crooked Lake	Stearns	A	15 ft	-	40
8	Mukooda Lake	St. Louis	A	16.6 ft	-	41
9	Alexander Lake	Morrison	A	16.5 ft	-	41
10	George Lake	Kandiyohi	A	15 ft	-	40
11	Brickyard Lake	Carver	A	15.1 ft	-	40
12	Little Bass Lake	Clearwater	A	-	-	43
13	Little Hubert Lake	Crow Wing	A	18 ft	-	40
14	White Bear Lake	Washington	A	15 ft	-	41
15	Pine Lake	Cass	A	16 ft	-	40
16	Lougee Lake	Crow Wing	A	16 ft	-	41
17	Rose Lake	St. Louis	A	-	-	46
18	Clamshell Lake	Crow Wing	A	15.1 ft	-	42
19	Lottie Lake	Douglas	A	16.1 ft	-	40
20	Edward Lake	Crow Wing	A	15.5 ft	-	41
21	South Sugar Lake	Itasca	A	15 ft	-	41
22	Grass Lake	Ramsey	A	-	-	42
23	Cass Lake Allens Bay	Beltrami	A	16.6 ft	-	41
24	Barnesville Lake	Clay	A	-	-	45
25	Laxon Lake	Beltrami	A	-	-	42
26	Little Sandy Lake	St. Louis	A	-	-	47
27	Cramer Lake	Lake	A	-	-	42
28	Cabin Lake	Lake	A	-	-	42
29	Crooked Lake	Cass	A	12 ft	-	42
30	Ames Lake	Itasca	A	10 ft	-	42
31	Lower Birch Lake	Isanti	A	10.8 ft	-	41
32	Steamboat Lake	Cass	A	12 ft	-	41
33	Taylor Lake Deep	Cook	A	10.6 ft	-	42
34	Trout Lake Deep	Cook	A	10.7 ft	-	42
35	Boxell Lake	Cass	A	14.5 ft	-	41
36	East Hunter Lake	Sherburne	A	22.1 ft	-	43
37	Clearwater Lake	Crow Wing	A	13.1 ft	-	40
38	Clearwater Lake	Clearwater	A	10.3 ft	-	43
39	Little Birch Lake	Todd	A	14 ft	-	42
40	North Long Lake	Crow Wing	A	14.6 ft	-	40
41	Round Lake	Crow Wing	A	13.5 ft	-	42
42	Round Lake	Otter Tail	A	11.6 ft	-	44
43	Round Lake	Becker	A	10.8 ft	-	44
44	Long Lake	Kandiyohi	A	10.5 ft	-	42
45	Long Lake	Otter Tail	A	11.8 ft	-	44
46	Long Lake	Otter Tail	A	12.1 ft	-	44
47	Long Lake	Beltrami	A	10 ft	-	44
48	Long Lake	Otter Tail	A	10.8 ft	-	43
49	Maple Lake	Douglas	A	13.7 ft	-	41
50	Detroit Lake	Becker	A	14 ft	-	42
51	Deer Lake	Beltrami	A	11 ft	-	43
52	Deer Lake	Hubbard	A	12.8 ft	-	40
53	Big Spunk Lake	Stearns	A	10 ft	-	43
54	Marion Lake	Otter Tail	A	11 ft	-	44
55	Sullivan Lake	Morrison	A	10.8 ft	-	43
56	Eagle Lake	Hubbard	A	11.3 ft	-	43
57	Darling Lake	Douglas	A	14.7 ft	-	43
58	Mantrap Lake	Hubbard	A	12 ft	-	43
59	Ida Lake	Wright	A	13.3 ft	-	41
60	Fish Lake	Le Sueur	A	11.8 ft	-	44
61	Sand Lake	Itasca	A	13 ft	-	43
62	Little Pine Lake	Crow Wing	A	10.2 ft	-	45
63	Union Lake	Polk	A	14.5 ft	-	40
64	Green Lake	Kandiyohi	A	13.1 ft	-	41
65	Upper Gull Lake	Cass	A	10 ft	-	45
66	Grace Lake	Beltrami	A	15.5 ft	-	43
67	Bass Lake	Crow Wing	A	13 ft	-	44
68	Bass Lake	Becker	A	12.8 ft	-	41
69	Bass Lake	Becker	A	11.2 ft	-	41
70	Island Lake	Hubbard	A	10.5 ft	-	44
71	Island Lake	Clearwater	A	14.1 ft	-	41
72	Portage Lake	Crow Wing	A	11.5 ft	-	42
73	Cedar Lake	Wright	A	15 ft	-	44
74	Spider Lake	Cass	A	10.2 ft	-	42
75	Mitchell Lake	Sherburne	A	10 ft	-	43
76	Pickerel Lake	Itasca	A	10.2 ft	-	45
77	Pickerel Lake	Hubbard	A	11.2 ft	-	42
78	George Lake	Hubbard	A	12.6 ft	-	40
79	Gull Lake	Cass	A	14.5 ft	-	40
80	Ray Lake	Cass	A	10 ft	-	41
81	Lawrence Lake	Cass	A	10 ft	-	44
82	Silver Lake	Otter Tail	A	11.3 ft	-	43
83	Child Lake	Cass	A	11.3 ft	-	42
84	Roy Lake	Crow Wing	A	12 ft	-	40
85	Rock Lake	Clearwater	A	11.2 ft	-	43
86	Inguadona Lake	Cass	A	12.1 ft	-	42
87	Swan Lake	Otter Tail	A	12.1 ft	-	43
88	Swan Lake	Itasca	A	13.5 ft	-	43
89	Big Marine Lake	Washington	A	11.5 ft	-	42
90	Velvet Lake	Crow Wing	A	10.8 ft	-	43
91	Rush Island Lake	Itasca	A	10.8 ft	-	43
92	Ann Lake	Sherburne	A	11.6 ft	-	43
93	Pleasant Lake	St. Louis	A	10 ft	-	42
94	Trowbridge Lake	Otter Tail	A	11 ft	-	43
95	Poplar Lake	Cook	A	10.2 ft	-	41
96	Roosevelt Lake	Cass	A	11 ft	-	41
97	Rabbit Lake	Crow Wing	A	12.1 ft	-	42
98	Linka Lake	Pope	A	10.2 ft	-	45
99	Elk Lake	Clearwater	A	12.4 ft	-	44
100	Bemidji Lake	Beltrami	A	12.5 ft	-	43

All mesotrophic lakes (MN+WI) →Wisconsin version →All Minnesota lakes →

Source: EPA National Aquatic Resource Surveys, 2026.