Genesee County Lake Quality
Michigan, 9 lakes, average grade C (Fair)
Genesee County has 9 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. Genesee 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 Byram Lake West Central Basin; Fenton Township (B); the most-stressed is Thread Lake (F).
Quick Answers for Genesee County
Planning a trip? Check special fishing regulations for Byram Lake West Central Basin; Fenton Township — or check the official Michigan fishing regulations.
All Lakes in Genesee County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Byram Lake West Central Basin; Fenton Township | B | 10 ft | - |
| 2 | Byram Lake | B | 10 ft | - |
| 3 | Silver Lake Central Basin | B | 12 ft | - |
| 4 | Silver Lake | B | 12 ft | - |
| 5 | Lobdell Lake West Basin; Argentine Township | C | 9 ft | - |
| 6 | Flint Park Lake | C | 3.8 ft | - |
| 7 | Thread Lake Central Basin | C | 1.8 ft | - |
| 8 | Flint Park Lake | D | 3.8 ft | - |
| 9 | Thread Lake | F | 1.8 ft | - |
Other Counties in Michigan
See how Genesee 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 Genesee County
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Source: EPA National Aquatic Resource Surveys, 2026.