Lakes With Algae Readings in Pennsylvania
21 lakes in Pennsylvania report elevated algae levels (chlorophyll-a above 20 µg/L). These lakes are most likely to develop blue-green algae blooms during warm, calm summer weather. Avoid swimming during visible blooms and rinse pets after contact.
Ranked List
| # | Lake | County | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|
| 1 | Speedwell Forge Dam | Lancaster | - | 88 µg/L | 89.3 µg/L |
| 2 | Middle Creek Reservoir | Lancaster | - | 225 µg/L | 74.1 µg/L |
| 3 | Colyer Lake | Centre | - | 43 µg/L | 72 µg/L |
| 4 | Edinboro Lake | Erie | - | 27.5 µg/L | 48 µg/L |
| 5 | Lake Luxembourg | Bucks | - | 82.5 µg/L | 46.4 µg/L |
| 6 | Green Lane Reservoir | Montgomery | - | 146 µg/L | 45.6 µg/L |
| 7 | Struble Lake | Chester | - | 84 µg/L | 45.3 µg/L |
| 8 | Harris Pond | Luzerne | - | 54 µg/L | 44.5 µg/L |
| 9 | Lake Nessmuk | Tioga | - | 46 µg/L | 41.2 µg/L |
| 10 | Shawnee Lake | Bedford | - | 53 µg/L | 37.4 µg/L |
| 11 | Walker Lake | Snyder | - | 83 µg/L | 36.4 µg/L |
| 12 | Moon Lake | Luzerne | - | 44 µg/L | 35.5 µg/L |
| 13 | Canonsburg Lake | Washington | - | 75 µg/L | 35.4 µg/L |
| 14 | Foster Joseph Sayers Lake | Centre | - | 21.5 µg/L | 34.7 µg/L |
| 15 | Beechwood Lake | Tioga | - | 42.5 µg/L | 32.3 µg/L |
| 16 | Minks Pond | Pike | - | - | 30.7 µg/L |
| 17 | Black Moshannon Lake | Centre | - | 25 µg/L | 25.4 µg/L |
| 18 | Shohola Marsh Reservoir | Pike | - | 58 µg/L | 23.4 µg/L |
| 19 | Lake Chillisquaque | Montour | - | 70 µg/L | 23 µg/L |
| 20 | Fords Lake | Lackawanna | - | 61.5 µg/L | 20.5 µg/L |
| 21 | Opossum Lake | Cumberland | - | 28 µg/L | 20.1 µg/L |
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