Arenac County Lake Quality
Wisconsin, 3 lakes, average grade C (Fair)
Only 3 lakes in Arenac County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. Arenac County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
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 Saginaw Bay About 9.5 Mi.Southeast Au Gres River Mouth Lake (B); the most-stressed is Saginaw Bay About 4 Mile Northe. of Pinconning River Lake (C).
Quick Answers for Arenac County
Planning a trip? Check special fishing regulations for Saginaw Bay About 9.5 Mi.Southeast Au Gres River Mouth Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Arenac County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Saginaw Bay About 9.5 Mi.Southeast Au Gres River Mouth Lake | B | 8.9 ft | - | - |
| 2 | Saginaw Bay About 9.5 Mi.S.E.Au Gres River Mouth Lake | B | 8.9 ft | - | - |
| 3 | Saginaw Bay About 4 Mile Northe. of Pinconning River Lake | C | 3.4 ft | - | - |
Source: EPA National Aquatic Resource Surveys, 2026.