Hypereutrophic Lakes in Michigan
3 hypereutrophic lakes in Michigan. Very high nutrients, dense algae, poor clarity.
Hypereutrophic lakes (TSI above 70) are at the upper end of the productivity scale: visible algal blooms most weeks of summer, clarity often under 3 feet, and meaningful risk of harmful-algal-bloom toxin events. 3 hypereutrophic lakes are on the Michigan books. Almost none of them are deep — 0% break 50 feet. Shallow basin plus heavy nutrient input is the consistent recipe.
Hypereutrophic lakes overwhelmingly grade D or F — the trophic class and the grade are measuring closely-related dimensions of the same underlying nutrient regime.
| # | Lake | County | Grade | Clarity | Depth | TSI |
|---|---|---|---|---|---|---|
| 1 | Fox Lake Central Basin; Dalton Township | Muskegon | D | 1 ft | - | 70 |
| 2 | Fox Lake | Muskegon | F | 1 ft | - | 77 |
| 3 | Sassafras Lake | Van Buren | F | - | - | 74 |
All hypereutrophic lakes →Minnesota version →Wisconsin version →Illinois version →Iowa version →Ohio version →Pennsylvania version →New York version →Missouri version →Indiana version →North Dakota version →South Dakota version →All Michigan lakes →
Source: EPA National Aquatic Resource Surveys, 2026.