Cass County Lake Quality
Wisconsin, 23 lakes, average grade C (Fair)
There are 23 graded lakes in Cass County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. 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. Stone Lake Central Basin; Jefferson Township (A) is the cleanest in the county.
Quick Answers for Cass County
Planning a trip? Check special fishing regulations for Stone Lake Central Basin; Jefferson Township, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Cass County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Stone Lake Central Basin; Jefferson Township | A | 16 ft | - | - |
| 2 | Birch Lake Central Basin; Porter Township | A | 13 ft | - | - |
| 3 | Lmj-13 Lake | A | 10 ft | - | - |
| 4 | Long Lake | B | 10.5 ft | - | - |
| 5 | Long Lake South Central Basin | B | 10.5 ft | - | - |
| 6 | Robbins Lake; Porter Township; Section 33 | B | 11.8 ft | - | - |
| 7 | Birch Lake | B | 13 ft | - | - |
| 8 | Robbins Lake | B | 11.8 ft | - | - |
| 9 | Eagle Lake West Central Basin; Ontwa Township | B | 6.3 ft | - | - |
| 10 | Christiana Lake Central Basin; Ontwa Township | B | 7 ft | - | - |
| 11 | Shavehead Lake East Basin; Porter Township | C | 7 ft | - | - |
| 12 | Shavehead Lake | C | 7 ft | - | - |
| 13 | Harwood Lake | C | 8.3 ft | - | - |
| 14 | Painter Lake Central Basin; Jefferson Township; T7s R14w; Section 36 | C | 7 ft | - | - |
| 15 | Christiana Lake | C | 6.8 ft | - | - |
| 16 | Baldwin Lake Northwest Basin | C | 8 ft | - | - |
| 17 | Juno Lake Central Basin; Mason Township | C | 7 ft | - | - |
| 18 | Baldwins Lake | C | 8 ft | - | - |
| 19 | Eagle Lake | D | 6 ft | - | - |
| 20 | Juno Lake | D | 6.5 ft | - | - |
| 21 | Painter Lake | D | 6.5 ft | - | - |
| 22 | Rodgers Lake | D | - | - | 70 µg/L |
| 23 | Gage Lake | F | - | - | 90 µg/L |
Source: EPA National Aquatic Resource Surveys, 2026.