Schoolcraft County Lake Quality
Wisconsin, 5 lakes, average grade B (Good)
Schoolcraft County has 5 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. With an average grade of B, Schoolcraft County sits comfortably above the Michigan median.
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 Twilight Lake (A); the most-stressed is Byers Lake (D).
Quick Answers for Schoolcraft County
Planning a trip? Check special fishing regulations for Twilight Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Schoolcraft County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Twilight Lake | A | 15.5 ft | - | - |
| 2 | Csmi 2015 Station 81220 Lake | A | - | - | - |
| 3 | Mi52b Lake | A | - | - | - |
| 4 | Big Island Lake | C | 9.2 ft | - | - |
| 5 | Byers Lake | D | 4.6 ft | - | - |
Source: EPA National Aquatic Resource Surveys, 2026.