Oakland County Lake Quality

Wisconsin, 45 lakes, average grade B (Good)

Oakland County's 45 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-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.

The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Square Lake Central Basin; Bloomfield Township (A); the most-stressed is Lost Lake; Oakland Township; Section 4 (D).

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Quick Answers for Oakland County

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

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

All Lakes in Oakland County

Rank	Lake	Grade	Clarity	Max Depth	Phosphorus
1	Square Lake Central Basin; Bloomfield Township	A	25 ft	-	-
2	Square Lake	A	23 ft	-	-
3	Oxbow Lake	A	15 ft	-	-
4	Maceday Lake Central Basin; Waterford Township Section 7	A	13 ft	-	-
5	Cass Lake South Central Basin; W. Bloomfield Township Section 3	A	12 ft	-	-
6	Lake Orion East Central Basin; Orion Township Section 11	A	13 ft	-	-
7	Lotus Lake Southeast Basin; Waterford Township Section 5	A	10 ft	-	-
8	Oxbow Lake Southeast Basin; White Lake Township Section 26	A	14.3 ft	-	-
9	Long Lake	B	13 ft	-	-
10	Long Lake Central Basin	B	13 ft	-	-
11	Lake Orion	B	13 ft	-	-
12	Round Lake; Independence Township; Section 2	B	10 ft	-	-
13	Maceday Lake	B	13 ft	-	-
14	Lotus Lake	B	10.8 ft	-	-
15	Middle Straits Lake	B	11 ft	-	-
16	Round Lake	B	10 ft	-	-
17	Lakeville Lake Central Basin	B	9.5 ft	-	-
18	Cedar Is. Lake East Central Basin,White Lake Township	B	11 ft	-	-
19	Cedar Island Lake	B	10.5 ft	-	-
20	Otter Lake North Basin; Waterford Township	B	10 ft	-	-
21	Middle Straits Lake Central Basin; West Bloomfield Township	B	11 ft	-	-
22	Cass Lake	B	12 ft	-	-
23	Otter Lake	B	10 ft	-	-
24	Upper Long Lake Northwest Basin; Bloomfield Township	B	8 ft	-	-
25	Wormer Lake	B	10 ft	-	-
26	Mohawk Lake	B	11 ft	-	-
27	Woodhull Lake Central Basin; Waterford Township	B	12 ft	-	-
28	Woodhull Lake	B	14.8 ft	-	-
29	Seymour Lake; Brandon Township; Section 34	C	9 ft	-	-
30	Seymour Lake	C	9 ft	-	-
31	Lakeville Lake	C	8.8 ft	-	-
32	Dollar Lake	C	9 ft	-	-
33	Cranberry Lake; Center of Deepest Basin; Independence Township	C	8 ft	-	-
34	Sylvan Lake; Sylvan Lake Township	C	9.5 ft	-	-
35	Cranberry Lake	C	7.3 ft	-	-
36	Sylvan Lake	C	9.5 ft	-	-
37	Twin Lakes	C	5 ft	-	-
38	Pleasant Lake	C	9 ft	-	-
39	Pleasant Lake; West Bloomfield Township	C	9.5 ft	-	-
40	Upper Long Lake	C	8 ft	-	-
41	Twin Lake; Oakland Township; Section 14	C	4.5 ft	-	-
42	Dollar Lake; Independence Township; Section 2	C	9 ft	-	-
43	Twin Lakes	D	5 ft	-	-
44	Tull Lake Central Basin; White Lake Township	D	4.5 ft	-	-
45	Lost Lake; Oakland Township; Section 4	D	6 ft	-	-

Source: EPA National Aquatic Resource Surveys, 2026.