Mesotrophic Lakes in Wisconsin

630 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. 630 lakes in Wisconsin sit in the mesotrophic band. About 15% 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	38 ft	41
3	Pike Lake	Polk	A	-	33 ft	42
4	Green Lake	Oconto	A	18.3 ft	25 ft	40
5	Deer Lake	Polk	A	16 ft	46 ft	41
6	Big Lake	Vilas	A	-	30 ft	45
7	Shell Lake	Washburn	A	16 ft	36 ft	40
8	Ward Lake	Burnett	A	-	21 ft	45
9	Viola Lake	Burnett	A	17 ft	34 ft	41
10	Perch Lake	Oneida	A	15 ft	56 ft	40
11	Blueberry Lake	Sawyer	A	14.9 ft	29 ft	41
12	Blueberry Lake	Vilas	A	-	-	42
13	Paddock Lake	Kenosha	A	15 ft	32 ft	41
14	Spring Lake	Waukesha	A	-	22 ft	40
15	Spring Lake	Washburn	A	-	24 ft	43
16	Ballard Lake	Vilas	A	15 ft	25 ft	41
17	Shay Lake	Oconto	A	15 ft	36 ft	40
18	Lost Lake	Marinette	A	-	18 ft	41
19	Unnamed Lake	Ozaukee	A	-	-	40
20	Mercer Lake	Oneida	A	-	23 ft	43
21	Mission Lake	Shawano	A	17.5 ft	44 ft	40
22	Pope Lake	Waupaca	A	16 ft	40 ft	40
23	Gates Lake	Ashland	A	-	17 ft	44
24	Smith Lake	Marinette	A	-	11 ft	44
25	Townsend Flowage Lake	Oconto	A	-	-	42
26	Cloud Lake	Forest	A	-	25 ft	41
27	Tea Lake	Ashland	A	-	48 ft	46
28	Trout Bog Lake	Vilas	A	-	24 ft	45
29	Crystal Bog Lake	Vilas	A	-	8 ft	41
30	Billy Boy Flowage Lake	Sawyer	A	-	46 ft	43
31	Little Trout Lake	Vilas	A	-	98 ft	41
32	Lake Helen	Portage	A	-	20 ft	44
33	Mosslake_deep	Vilas	A	-	29 ft	44
34	Little Mccall Lake	Marinette	A	-	21 ft	42
35	Park Creek Pond	Douglas	A	-	7 ft	46
36	Round Lake Northeast Site	Chippewa	A	-	18 ft	46
37	Sanborn Lake	Vilas	A	-	13 ft	44
38	Moss Lake East	Vilas	A	-	29 ft	44
39	Amy Bell Lake	Washington	A	-	37 ft	46
40	Trego Lake	Washburn	A	-	36 ft	46
41	Little Archibald Lake	Oconto	A	-	65 ft	43
42	Tambling Lake	Vilas	A	-	11 ft	41
43	Moldenhauer Lake	Ozaukee	A	-	32 ft	40
44	Brekke Lake	Waupaca	A	-	25 ft	43
45	Greater Bass Lake	Langlade	A	-	25 ft	43
46	Christner Lake	Sawyer	A	12 ft	16 ft	41
47	Ashegon Lake	Sawyer	A	10.5 ft	56 ft	45
48	Lost Lake	Sawyer	A	10.6 ft	13 ft	44
49	Big Cedar Lake-North Site-Near West Bend	Washington	A	11.8 ft	105 ft	43
50	Big Cedar Lake-South Site-Near West Bend	Washington	A	12.6 ft	105 ft	42
51	Lake Beulah	Walworth	A	11 ft	58 ft	42
52	Okauchee Lake	Waukesha	A	11.3 ft	90 ft	44
53	Powers Lake	Kenosha	A	10 ft	33 ft	44
54	Silver Lake	Waukesha	A	10 ft	40 ft	42
55	Silver Lake	Waushara	A	14.5 ft	56 ft	41
56	Silver Lake	Barron	A	13 ft	91 ft	40
57	Silver Lake	Waushara	A	10.2 ft	50 ft	43
58	Silver Lake	Vilas	A	12.1 ft	19 ft	43
59	Cedar Lake	Manitowoc	A	10.2 ft	-	45
60	Mirror Lake	Waupaca	A	13 ft	43 ft	41
61	Bass Lake	Florence	A	12 ft	16 ft	40
62	Bass Lake	St. Croix	A	10 ft	-	43
63	Bass Lake	Barron	A	10 ft	14 ft	44
64	Bass Lake	Vilas	A	12.8 ft	15 ft	43
65	Bass Lake	Lincoln	A	12.5 ft	40 ft	41
66	Kusel Lake	Waushara	A	11.5 ft	29 ft	43
67	Marl Lake	Waushara	A	12.2 ft	35 ft	42
68	Indian Lake	Oneida	A	11 ft	26 ft	42
69	Little Pickerel Lake	Oconto	A	11 ft	20 ft	44
70	Ottawa Lake	Waukesha	A	13 ft	16 ft	42
71	Spider Lake	Sawyer	A	10.5 ft	64 ft	43
72	Spider Lake	Vilas	A	10.5 ft	43 ft	43
73	Crooked Lake	Oconto	A	11 ft	37 ft	41
74	Towanda Lake	Vilas	A	10.5 ft	27 ft	42
75	Boulder Lake	Oconto	A	11 ft	11 ft	42
76	Beaver Dam Lake	Barron	A	11 ft	106 ft	42
77	Round Lake	Shawano	A	11 ft	39 ft	43
78	Ashippun Lake	Waukesha	A	10 ft	35 ft	42
79	Bear Lake	Waupaca	A	11 ft	62 ft	44
80	Long Lake	Waupaca	A	13 ft	76 ft	40
81	Long Lake	Chippewa	A	13 ft	101 ft	40
82	Legend Lake	Menominee	A	10 ft	-	43
83	Rock Lake	Kenosha	A	10 ft	33 ft	44
84	Rock Lake	Jefferson	A	12 ft	60 ft	44
85	North Lake	Waupaca	A	12.5 ft	33 ft	42
86	Pretty Lake	Waukesha	A	12.2 ft	31 ft	41
87	Pleasant Lake	Waushara	A	11.5 ft	24 ft	41
88	Pleasant Lake	Walworth	A	12 ft	29 ft	42
89	Anderson Lake	Oconto	A	10 ft	40 ft	44
90	Lake Morris	Waushara	A	11 ft	40 ft	44
91	Shadow Lake	Waupaca	A	12 ft	41 ft	41
92	Kelly Lake	Oconto	A	10 ft	41 ft	43
93	High Lake	Vilas	A	10 ft	36 ft	43
94	Green Lake	Walworth	A	11 ft	57 ft	40
95	Lilly Lake	Kenosha	A	13.5 ft	22 ft	41
96	Imogene Lake	Vilas	A	10 ft	41 ft	43
97	Crescent Lake	Oneida	A	14 ft	-	40
98	Red Cedar Lake	Barron	A	10.1 ft	53 ft	45
99	Big Sand Lake	Burnett	A	11 ft	55 ft	45
100	Velvet Lake	Oneida	A	12.9 ft	16 ft	42

All mesotrophic lakes →Minnesota 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 Wisconsin lakes →

Source: EPA National Aquatic Resource Surveys, 2026.