Hypereutrophic Lakes in Pennsylvania
10 hypereutrophic lakes in Pennsylvania. 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. 10 hypereutrophic lakes are on the Pennsylvania books. Almost none of them are deep — 0% break 50 feet. Shallow basin plus heavy nutrient input is the consistent recipe.
Hypereutrophic lakes carry the highest phosphorus and chlorophyll-a readings on record; the trophic class and the readings are measuring closely related dimensions of the same underlying nutrient regime.
| # | Lake | County | Clarity | Depth | TSI |
|---|---|---|---|---|---|
| 1 | Walker Lake | Snyder | - | 32.2 ft | - |
| 2 | Shawnee Lake | Bedford | - | 31 ft | - |
| 3 | Struble Lake | Chester | - | 30 ft | - |
| 4 | Green Lane Reservoir | Montgomery | - | - | - |
| 5 | Harris Pond | Luzerne | - | - | - |
| 6 | Lake Luxembourg | Bucks | - | 27.6 ft | - |
| 7 | Foster Joseph Sayers Lake | Centre | - | - | - |
| 8 | Colyer Lake | Centre | - | - | - |
| 9 | Canonsburg Lake | Washington | - | - | - |
| 10 | Middle Creek Reservoir | Lancaster | - | - | - |
All hypereutrophic lakes →Minnesota version →Wisconsin version →Illinois version →Michigan version →Iowa version →Ohio 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 →Alabama version →Virginia version →Kentucky version →Utah version →Washington version →Wyoming version →Georgia version →Massachusetts version →Ontario version →Québec version →Nova Scotia version →British Columbia version →Newfoundland and Labrador version →All Pennsylvania lakes →
Source: EPA National Aquatic Resource Surveys, 2026.