Shiawassee County Lake Quality
Michigan, 6 lakes, average grade C (Fair)
Shiawassee County has 6 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 average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
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 Aginaw Lake (C); the most-stressed is Rose Lake (D).
Quick Answers for Shiawassee County
Planning a trip? Check special fishing regulations for Aginaw Lake — or check the official Michigan fishing regulations.
Fishing in Shiawassee County
All Lakes in Shiawassee County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Aginaw Lake | C | 8 ft | - |
| 2 | Rose Lake | C | 5 ft | - |
| 3 | Round Lake | C | 6 ft | - |
| 4 | Rose Lake | D | 5.5 ft | - |
| 5 | Round Lake | D | 6.5 ft | - |
Other Counties in Michigan
See how Shiawassee County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 15 states.
Where to stay near Shiawassee County
Top-rated places to stay near Shiawassee County
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Shiawassee County?
Get lake water-quality report cards plus the best cabin & lodging deals near Shiawassee County — straight to your inbox. No spam, unsubscribe anytime.
Source: EPA National Aquatic Resource Surveys, 2026.