Hypereutrophic Lakes in Alabama
4 hypereutrophic lakes in Alabama. 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. 4 hypereutrophic lakes are on the {{stateName}} 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 | Nla Lake | Mobile | C | 4.8 ft | - | 81 |
| 2 | Nla Lake | Clay | C | 5.5 ft | - | 84 |
| 3 | Nla Lake | Cullman | D | 2.2 ft | - | 86 |
| 4 | Nla Lake | Calhoun | D | 2.1 ft | - | 96 |
All hypereutrophic lakes →Minnesota version →Wisconsin version →Illinois version →Michigan version →Iowa version →Ohio version →Pennsylvania version →New York version →Missouri version →Indiana version →North Dakota version →South Dakota version →Florida version →Colorado version →North Carolina version →Vermont version →Texas version →Oregon version →Arkansas version →Oklahoma version →Kansas version →Nebraska version →Nevada version →Arizona version →Idaho version →Montana version →New Mexico version →Tennessee version →Virginia version →Kentucky version →Utah version →Washington version →Wyoming version →All Alabama lakes →
Source: EPA National Aquatic Resource Surveys, 2026.