Mesotrophic Lakes in Wisconsin

644 mesotrophic lakes in Wisconsin. Moderate nutrients, good water quality.

Mesotrophic lakes are the productive middle of the trophic scale — TSI between 40 and 50. Clear enough to be inviting, productive enough to support a strong fishery, with moderate phosphorus and a modest algal community that does not dominate the optical signal. 644 lakes in Wisconsin 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	Explosion Lake	Oconto	A	17 ft	-	40
2	Two Island Lake	Chippewa	A	15.3 ft	-	41
3	Pike Lake	Polk	A	-	-	42
4	Green Lake	Oconto	A	18.3 ft	-	40
5	Big Lake	Vilas	A	-	-	45
6	Deer Lake	Polk	A	16 ft	-	41
7	Shell Lake	Washburn	A	16 ft	-	40
8	Ward Lake	Burnett	A	-	-	45
9	Viola Lake	Burnett	A	17 ft	-	41
10	Perch Lake	Oneida	A	15 ft	-	40
11	Blueberry Lake	Vilas	A	-	-	42
12	Paddock Lake	Kenosha	A	15 ft	-	41
13	Spring Lake	Waukesha	A	-	-	40
14	Spring Lake	Washburn	A	-	-	43
15	Ballard Lake	Vilas	A	15 ft	-	41
16	Shay Lake	Oconto	A	15 ft	-	40
17	Lost Lake	Marinette	A	-	-	41
18	Unnamed Lake	Ozaukee	A	-	-	40
19	Mercer Lake	Oneida	A	-	-	43
20	Mission Lake	Shawano	A	17.5 ft	-	40
21	Pope Lake	Waupaca	A	16 ft	-	40
22	Gates Lake	Ashland	A	-	-	44
23	Smith Lake	Marinette	A	-	-	44
24	Townsend Flowage Lake	Oconto	A	-	-	42
25	Okauchee Lake-Site No. 4-at Okauchee	Waukesha	A	-	-	45
26	Okauchee Lake-Site No. 3-at Okauchee	Waukesha	A	-	-	45
27	Lk Superior .09 Mi N of Poplar Creek Mouth Lake	Douglas	A	-	-	44
28	Cloud Lake	Forest	A	-	-	41
29	Tea Lake	Ashland	A	-	-	46
30	Trout Bog Lake	Vilas	A	-	-	45
31	Crystal Bog Lake	Vilas	A	-	-	41
32	Billy Boy Flowage Lake	Sawyer	A	-	-	43
33	Little Trout Lake	Vilas	A	-	-	41
34	Lake Helen	Portage	A	-	-	44
35	Little Mccall Lake	Marinette	A	-	-	42
36	Park Creek Pond	Douglas	A	-	-	46
37	Round Lake Northeast Site	Chippewa	A	-	-	46
38	Sanborn Lake	Vilas	A	-	-	44
39	Moss Lake East	Vilas	A	-	-	44
40	Amy Bell Lake	Washington	A	-	-	47
41	Trego Lake	Washburn	A	-	-	45
42	Little Archibald Lake	Oconto	A	-	-	43
43	Tambling Lake	Vilas	A	-	-	43
44	Moldenhauer Lake	Ozaukee	A	-	-	40
45	Greater Bass Lake	Langlade	A	-	-	41
46	Csmi 2015 Station Q Lake	Milwaukee	A	-	-	41
47	Christner Lake	Sawyer	A	12 ft	-	41
48	Ashegon Lake	Sawyer	A	10.5 ft	-	45
49	Blueberry Lake	Sawyer	A	14.8 ft	-	41
50	Lost Lake	Sawyer	A	10.6 ft	-	44
51	Big Cedar Lake-North Site-Near West Bend	Washington	A	11.8 ft	-	43
52	Oconomowoc Lake No. 1	Waukesha	A	13.8 ft	-	42
53	Big Cedar Lake-South Site-Near West Bend	Washington	A	12.6 ft	-	42
54	Lake Beulah Station 2	Walworth	A	10.8 ft	-	44
55	Lake Beulah	Walworth	A	11 ft	-	42
56	Okauchee Lake	Waukesha	A	11.3 ft	-	44
57	Oconomowoc Lake 2	Waukesha	A	14.2 ft	-	41
58	Powers Lake	Kenosha	A	10 ft	-	44
59	Boulder Lake	Oconto	A	11 ft	-	42
60	Spider Lake	Sawyer	A	10.5 ft	-	43
61	Spider Lake	Vilas	A	10.5 ft	-	43
62	Beaver Dam Lake	Barron	A	11 ft	-	42
63	Silver Lake	Waukesha	A	10 ft	-	42
64	Silver Lake	Waushara	A	14.5 ft	-	41
65	Silver Lake	Barron	A	13 ft	-	40
66	Silver Lake	Waushara	A	10.2 ft	-	43
67	Silver Lake	Vilas	A	12.1 ft	-	43
68	Round Lake	Shawano	A	11 ft	-	43
69	Cedar Lake	Manitowoc	A	10.2 ft	-	44
70	Mirror Lake	Waupaca	A	13 ft	-	41
71	Bass Lake	Florence	A	12 ft	-	40
72	Bass Lake	St. Croix	A	10 ft	-	43
73	Bass Lake	Vilas	A	12.8 ft	-	43
74	Bass Lake	Lincoln	A	12.5 ft	-	41
75	Ashippun Lake	Waukesha	A	10 ft	-	42
76	Kusel Lake	Waushara	A	11.5 ft	-	43
77	Marl Lake	Waushara	A	12.2 ft	-	42
78	Indian Lake	Oneida	A	11 ft	-	42
79	Little Pickerel Lake	Oconto	A	11 ft	-	44
80	Ottawa Lake	Waukesha	A	13 ft	-	42
81	Bear Lake	Waupaca	A	11 ft	-	44
82	Long Lake	Waupaca	A	13 ft	-	40
83	Long Lake	Chippewa	A	12.7 ft	-	40
84	Crooked Lake	Oconto	A	11 ft	-	41
85	Towanda Lake	Vilas	A	10.5 ft	-	42
86	Legend Lake	Menominee	A	10 ft	-	43
87	Lilly Lake	Kenosha	A	13.5 ft	-	41
88	Rock Lake	Kenosha	A	10 ft	-	44
89	Rock Lake	Jefferson	A	12.5 ft	-	43
90	North Lake	Waupaca	A	12.5 ft	-	42
91	Imogene Lake	Vilas	A	10 ft	-	43
92	Pleasant Lake	Waushara	A	11.5 ft	-	41
93	Pleasant Lake	Walworth	A	12 ft	-	42
94	Pretty Lake	Waukesha	A	12.2 ft	-	41
95	Crescent Lake	Oneida	A	14 ft	-	40
96	Anderson Lake	Oconto	A	10 ft	-	44
97	Lake Morris	Waushara	A	11 ft	-	44
98	Red Cedar Lake	Barron	A	10.1 ft	-	45
99	Big Sand Lake	Burnett	A	10.5 ft	-	44
100	Velvet Lake	Oneida	A	12.9 ft	-	42

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

Source: EPA National Aquatic Resource Surveys, 2026.