Kent County Lake Quality

Wisconsin, 18 lakes, average grade C (Fair)

Kent County's 18 graded lakes fall in the moderate-density bracket for Michigan. The county-level average smooths over real differences — a single agricultural watershed near the southwest corner can pull the average down even if the rest of the county runs clean. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.

Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Murray Lake East Basin; Grattan Township (B) is the cleanest in the county.

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Quick Answers for Kent County

Cleanest lakes in Kent County →Cleanest lakes in Wisconsin →Safest swimming lakes in Wisconsin →

Planning a trip? Check special fishing regulations for Murray Lake East Basin; Grattan Township, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.

All Lakes in Kent County

Rank	Lake	Grade	Clarity	Max Depth	Phosphorus
1	Murray Lake East Basin; Grattan Township	B	7.2 ft	-	-
2	Big Pine Island Lake North Central Basin	B	10 ft	-	-
3	Big Crooked Lake South Basin; Grattan Township	B	11.5 ft	-	-
4	Scram Lake East Basin; Oakfield Township	B	11.5 ft	-	-
5	Emerald Lake	B	12 ft	-	-
6	Big Crooked Lake	B	11.5 ft	-	-
7	Scram Lake	B	10.5 ft	-	-
8	Emerald Lake	B	12.3 ft	-	-
9	Maston Lake Northeast Basin; Spencer Township	B	14.5 ft	-	-
10	Murray Lake	C	7 ft	-	-
11	Big Pine Island Lake	C	9.5 ft	-	-
12	Round Lake	C	8 ft	-	-
13	Round Lake Central Basin; Grattan Township	C	8 ft	-	-
14	Maston Lake	C	9 ft	-	-
15	Nelson Lake	C	7 ft	-	-
16	Meek Lake	C	9 ft	-	-
17	High Lake Central Basin; Aloma Township	D	6.3 ft	-	-
18	High Lake	D	6.3 ft	-	-

Source: EPA National Aquatic Resource Surveys, 2026.