Allegan County Lake Quality
Michigan, 12 lakes, average grade C (Fair)
Only 12 lakes in Allegan 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. Allegan 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 Eagle Lake North Central Basin (A); the most-stressed is Swan Lake West Central Basin,Cheshire Township (F).
Quick Answers for Allegan County
Planning a trip? Check special fishing regulations for Eagle Lake North Central Basin — or check the official Michigan fishing regulations.
Fishing in Allegan County
All Lakes in Allegan County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Eagle Lake North Central Basin | A | 14 ft | - |
| 2 | Eagle Lake | B | 14 ft | - |
| 3 | Miner Lake West Central Basin,Allegan Township | B | 10.5 ft | - |
| 4 | Ingerson Lake | B | 9 ft | 41.5 µg/L |
| 5 | Osterhout Lake | C | 9 ft | - |
| 6 | Osterhout Lake Northern Basin | C | 8.5 ft | - |
| 7 | Green Lake | C | 8 ft | - |
| 8 | Green Lake Southwest Basin; Leighton Township | C | 8 ft | - |
| 9 | Moore Lake | C | 6.2 ft | 38 µg/L |
| 10 | Swan Lake West Central Basin,Cheshire Township | F | 3 ft | - |
Other Counties in Michigan
See how Allegan 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 Allegan County
Top-rated places to stay near Allegan 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 Allegan County?
Get lake water-quality report cards plus the best cabin & lodging deals near Allegan County — straight to your inbox. No spam, unsubscribe anytime.
Source: EPA National Aquatic Resource Surveys, 2026.