Cheboygan County Lake Quality
Wisconsin, 7 lakes, average grade A (Excellent)
Cheboygan County has 7 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. The county's average grade is A — among the cleanest in Michigan. 5 lakes pull an A on their own, and almost none fall into the D or F brackets.
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. Burt Lake (A) is the cleanest in the county.
Quick Answers for Cheboygan County
Planning a trip? Check special fishing regulations for Burt Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Cheboygan County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Burt Lake | A | 15.5 ft | - | - |
| 2 | Silver Lake | A | 32 ft | - | - |
| 3 | Long Lake | A | 18 ft | - | - |
| 4 | Black Lake | A | 16 ft | - | - |
| 5 | Black Lake Southwest Basin; Grant Township | A | 13 ft | - | - |
| 6 | Mullett Lake | B | 13 ft | - | - |
| 7 | Douglas Lake | B | 12 ft | - | - |
Source: EPA National Aquatic Resource Surveys, 2026.