Allegan County Lake Quality
Michigan, 11 lakes, average grade B (Good)
Only 11 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. With an average grade of B, Allegan County sits comfortably above the Michigan median.
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 Osterhout Lake (A); the most-stressed is Moore Lake (C).
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Quick Answers for Allegan County
Planning a trip? Check special fishing regulations for Osterhout Lake — or check the official Michigan fishing regulations.
Fishing in Allegan County
All Lakes in Allegan County
11 lakes · 4 graded, 7 not rated4 graded lakes · 7 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|---|
| 1 | AOsterhout LakeAllegan | A | 9 ft | 14 µg/L | 2.8 µg/L | No recent samples | No recent samples | Not recorded |
| 2 | BHutchins LakeAllegan | B | 13 ft | 13.5 µg/L | No recent samples | No recent samples | No recent samples | Not recorded |
| 3 | CMoore LakeAllegan | C | 6.2 ft | 38 µg/L | No recent samples | No recent samples | No recent samples | Not recorded |
| 4 | CIngerson LakeAllegan | C | 9 ft | 39 µg/L | 1.4 µg/L | No recent samples | No recent samples | Not recorded |
| NREagle LakeAllegan | NR | 15 ft | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRKalamazoo LakeAllegan | NR | 2.4 ft | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRGreen LakeAllegan | NR | 8 ft | No recent samples | No recent samples | No recent samples | 60 ft | ✓ Public | |
| NRSwan LakeAllegan | NR | 3 ft | 65 µg/L | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRMiner LakeAllegan | NR | 10.5 ft | 14 µg/L | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRSelkirk LakeAllegan | NR | No recent samples | 17 µg/L | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRLongterm LakeAllegan | NR | No recent samples | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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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 49 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.