Lakes With Algae Problems in North Dakota
29 lakes in North Dakota 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 | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Buffalo Lake | Pierce | F | 0.3 ft | - | 219.5 µg/L |
| 2 | Juanita Lake | Foster | NR | 1 ft | - | 154.2 µg/L |
| 3 | Mchugh Slough Lake | Nelson | F | 1.6 ft | 416 µg/L | 88.7 µg/L |
| 4 | Morrison Lake | Ramsey | F | 1.9 ft | 548.5 µg/L | 85.9 µg/L |
| 5 | Kalmbach Lake | LaMoure | NR | 0.7 ft | - | 73.8 µg/L |
| 6 | Sweetbriar Dam Lake | Morton | F | 3 ft | 353 µg/L | 54 µg/L |
| 7 | Cedar Lake | Slope | C | 1.3 ft | 136.5 µg/L | 53.4 µg/L |
| 8 | Harmon Lake | Morton | F | - | 20 µg/L | 48.5 µg/L |
| 9 | Antelope Lake | Pierce | F | 3.5 ft | - | 43.6 µg/L |
| 10 | Sprague Lake | Sargent | NR | 1.6 ft | - | 43.4 µg/L |
| 11 | Eastern Stump Lake | Nelson | F | 4.7 ft | 148.5 µg/L | 39.1 µg/L |
| 12 | East Stump Lake | Nelson | NR | 8.5 ft | - | 37.9 µg/L |
| 13 | Froelich Dam Lake | Sioux | D | 3.9 ft | 311.5 µg/L | 37.5 µg/L |
| 14 | Sweet Briar Dam-Mid Reservoir | Morton | F | 3 ft | 239.5 µg/L | 36.9 µg/L |
| 15 | Western Stump Lake | Nelson | F | 4.3 ft | 165.5 µg/L | 36.7 µg/L |
| 16 | Dead Colt Creek Dam Lake | Ransom | NR | 3.3 ft | - | 32.3 µg/L |
| 17 | Mirror Lake | Adams | F | 2.1 ft | 388 µg/L | 31.6 µg/L |
| 18 | Brewer Lake | Cass | NR | 4.3 ft | - | 31.1 µg/L |
| 19 | Odland Dam Lake | Golden Valley | D | 1.5 ft | 135.5 µg/L | 29.6 µg/L |
| 20 | Warsing Dam Lake | Eddy | D | 2.3 ft | - | 25.7 µg/L |
| 21 | Nygren Dam Lake | Morton | D | 2.6 ft | 73 µg/L | 24.7 µg/L |
| 22 | Castle Rock Dam Lake | Hettinger | D | 3.8 ft | 148 µg/L | 24.3 µg/L |
| 23 | Barnes Lake | Stutsman | NR | 6.4 ft | - | 24 µg/L |
| 24 | Nelson Lake | Oliver | C | 1.3 ft | 275 µg/L | 23.1 µg/L |
| 25 | Lake Laretta | Nelson | D | 3.3 ft | 253.5 µg/L | 21.7 µg/L |
| 26 | Pelican Lake | Ramsey | D | 3.7 ft | 396 µg/L | 21.2 µg/L |
| 27 | Epping-Springbrook Dam-Deepest Lake | Williams | D | 4.9 ft | 689.5 µg/L | 20.4 µg/L |
| 28 | West Stump Lake | Nelson | NR | 9.8 ft | - | 20.1 µg/L |
| 29 | Tioga Dam Lake | Williams | D | 2.2 ft | 182 µg/L | 20 µg/L |