What are mesotrophic lakes in Wisconsin?

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

What does mesotrophic mean?

Moderate nutrients, good water quality.

Mesotrophic Lakes in Wisconsin

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. 402 lakes in Wisconsin sit in the mesotrophic band. About 16% are deep (50+ ft); the rest are shallower basins where watershed management keeps nutrients from pushing the system into eutrophy.

Mesotrophic lakes sit in the middle of the phosphorus and chlorophyll-a range: productive but still clear, with readings that rarely reach the EPA's poorest condition class.

#	Lake	County	Clarity	Depth	TSI
1	Big Cedar Lake-North Site-Near West Bend	Washington	11.8 ft	105 ft	43
2	Green Lake	Green Lake	13.5 ft	236 ft	47
3	Lake Beulah	Walworth	10 ft	58 ft	42
4	Powers Lake	Kenosha	10 ft	33 ft	44
5	Lac Courte Oreilles Lake	Sawyer	12.2 ft	90 ft	40
6	Indian Lake	Sawyer	6.5 ft	9 ft	47
7	Big Sand Lake	Burnett	11 ft	55 ft	43
8	Big Lake	Shawano	8 ft	-	44
9	Christner Lake	Sawyer	12 ft	16 ft	42
10	Sand Lake	Barron	13 ft	-	41
11	Sand Lake	Sawyer	10 ft	50 ft	46
12	Ashegon Lake	Sawyer	10.5 ft	56 ft	43
13	Koonz Lake	Shawano	10.8 ft	40 ft	41
14	Lost Lake	Sawyer	10.6 ft	13 ft	42
15	Durphee Lake	Sawyer	8.1 ft	-	46
16	Malone Lake	Shawano	13.5 ft	31 ft	41
17	Sams Lake	Shawano	11 ft	13 ft	42
18	Bealeau Lake	Shawano	11.5 ft	24 ft	42
19	Mole Lake	Forest	8.5 ft	17 ft	41
20	Devil'S Lake	Forest	-	-	44
21	Wind Lake	Polk	10 ft	7 ft	45
22	Green Lake	Walworth	11 ft	57 ft	40
23	Green Lake	Washington	9 ft	37 ft	45
24	Boulder Lake	Oconto	11 ft	11 ft	42
25	Lake Noquebay	Marinette	7.3 ft	51 ft	48
26	Spider Lake	Iron	8.5 ft	-	44
27	Spider Lake	Sawyer	10.5 ft	64 ft	43
28	Spider Lake	Vilas	10.5 ft	43 ft	43
29	Pickerel Lake	Forest	10 ft	19 ft	46
30	Pickerel Lake	Oconto	8 ft	10 ft	45
31	Pickerel Lake	Lincoln	-	14 ft	48
32	Carpenter Lake	Vilas	7.5 ft	16 ft	47
33	Cranberry Lake	Burnett	8.8 ft	26 ft	44
34	Cranberry Lake	Bayfield	9 ft	12 ft	46
35	Beaver Dam Lake	Barron	11 ft	106 ft	42
36	North Turtle Lake	Vilas	8.5 ft	58 ft	45
37	Balsam Lake	Washburn	8.8 ft	-	46
38	Silver Lake	Kenosha	7.1 ft	44 ft	47
39	Silver Lake	Waukesha	10 ft	40 ft	42
40	Silver Lake	Waushara	14.8 ft	56 ft	41
41	Silver Lake	Barron	13 ft	91 ft	40
42	Silver Lake	Waupaca	7 ft	17 ft	48
43	Silver Lake	Waushara	10.2 ft	50 ft	43
44	Silver Lake	Vilas	12.1 ft	19 ft	43
45	Silver Lake	Forest	13 ft	20 ft	40
46	Whitefish Lake	Oneida	8.8 ft	33 ft	45
47	Round Lake	Shawano	11 ft	39 ft	43
48	Round Lake	Chippewa	8.4 ft	18 ft	46
49	Cedar Lake	Manitowoc	10.2 ft	21 ft	45
50	Cedar Lake	Iron	7.5 ft	21 ft	47
51	Mirror Lake	Waupaca	13 ft	43 ft	42
52	Deep Lake	Washburn	7.5 ft	25 ft	46
53	Bass Lake	Florence	12 ft	16 ft	40
54	Bass Lake	Oneida	6 ft	20 ft	50
55	Bass Lake	Price	8.8 ft	46 ft	44
56	Bass Lake	St. Croix	10 ft	-	43
57	Bass Lake	Barron	10 ft	14 ft	44
58	Bass Lake	Vilas	12.8 ft	15 ft	43
59	Bass Lake	Lincoln	12.5 ft	40 ft	41
60	Little Friess Lake	Washington	7.4 ft	34 ft	50
61	Ashippun Lake	Waukesha	10 ft	35 ft	43
62	Callahan Lake	Sawyer	10.6 ft	18 ft	46
63	Kusel Lake	Waushara	11.5 ft	29 ft	43
64	Berry Lake	Oconto	7.5 ft	27 ft	46
65	Spencer Lake	Waupaca	8.5 ft	53 ft	43
66	Pioneer Lake	Vilas	9.5 ft	27 ft	44
67	Bone Lake	Polk	8 ft	43 ft	47
68	Marl Lake	Waushara	12 ft	35 ft	43
69	Indian Lake	Oneida	11 ft	26 ft	42
70	Turtle Flambeau Flowage Lake	Iron	6 ft	-	49
71	Little Pickerel Lake	Oconto	11 ft	20 ft	44
72	Tom Doyle Lake	Oneida	7 ft	30 ft	45
73	Oxbow Lake	Vilas	8 ft	44 ft	45
74	Ottawa Lake	Waukesha	13 ft	16 ft	41
75	Two Island Lake	Chippewa	15.3 ft	38 ft	40
76	Bear Lake	Forest	5.6 ft	20 ft	49
77	Bear Lake	Oneida	8 ft	20 ft	46
78	Bear Lake	Barron	6.2 ft	87 ft	48
79	Bear Lake	Waupaca	11 ft	62 ft	44
80	Bear Lake	Oconto	9 ft	20 ft	44
81	Long Lake	Washburn	9.5 ft	-	45
82	Long Lake	Waupaca	13 ft	76 ft	40
83	Long Lake	Fond du Lac	9.1 ft	47 ft	46
84	Long Lake	Chippewa	13.1 ft	101 ft	40
85	Crooked Lake	Waukesha	8 ft	16 ft	46
86	Crooked Lake	Adams	9 ft	56 ft	45
87	Crooked Lake	Oconto	11 ft	37 ft	41
88	Towanda Lake	Vilas	10.5 ft	27 ft	42
89	Wilke Lake	Manitowoc	7 ft	21 ft	47
90	Birch Lake	Vilas	6.5 ft	45 ft	47
91	Legend Lake	Menominee	10 ft	-	43
92	Lilly Lake	Kenosha	13.5 ft	22 ft	41
93	East Alaska Lake	Kewaunee	9.5 ft	50 ft	44
94	Rock Lake	Kenosha	10 ft	33 ft	44
95	Rock Lake	Jefferson	12 ft	60 ft	44
96	North Lake	Waukesha	8 ft	78.4 ft	46
97	North Lake	Waupaca	12.5 ft	33 ft	42
98	Imogene Lake	Vilas	10 ft	41 ft	44
99	Pike Lake	Washington	7 ft	45 ft	48
100	Pleasant Lake	Waushara	11.5 ft	24 ft	41

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

Source: EPA National Aquatic Resource Surveys, 2026.