Cleanest Lakes in Oregon
Odell Lake in Klamath County leads the rankings with a water quality grade of A and 22.3 ft of clarity. Below are the top 25 cleanest monitored lakes in Oregon, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Odell Lake | Klamath | A | 22.3 ft | - | 1.1 µg/L |
| 2 | Crescent Lake | Klamath | A | 42.2 ft | - | 0.7 µg/L |
| 3 | Odell Lake | Klamath | A | 18.7 ft | - | 1.3 µg/L |
| 4 | Crescent Lake | Klamath | A | 51.7 ft | - | 0.5 µg/L |
| 5 | Lava Lake | Deschutes | A | 17.6 ft | - | 7.4 µg/L |
| 6 | Wickiup Reservoir | Deschutes | A | 11.2 ft | - | 2.7 µg/L |
| 7 | Billy Chinook Reservoir | Jefferson | B | 8.4 ft | - | 2.4 µg/L |
| 8 | Crane Prairie Reservoir | Deschutes | B | 8.4 ft | - | 3.7 µg/L |
| 9 | Crane Prairie Reservoir | Deschutes | B | 12.5 ft | - | 5.1 µg/L |
| 10 | Deschutes River Arm Lake | Jefferson | B | 4.6 ft | - | 4.4 µg/L |
| 11 | Billy Chinook Reservoir | Jefferson | B | 4.4 ft | - | 1.9 µg/L |
| 12 | Phillips Lake | Baker | B | 5.9 ft | 17.5 µg/L | - |
| 13 | Wickiup Reservoir | Deschutes | B | 8.2 ft | - | 7 µg/L |
| 14 | Lava Lake | Deschutes | C | 6.6 ft | - | 5.2 µg/L |
| 15 | Bully Creek Lake | Malheur | D | 4.9 ft | 110 µg/L | - |
| 16 | Mckay Lake | Umatilla | F | 3.3 ft | 121.5 µg/L | - |
| 17 | Howard Prairie Reservoir | Jackson | F | 2.3 ft | 124 µg/L | - |
| 18 | Williamson River Outlet Lake | Klamath | F | - | 165 µg/L | 70.5 µg/L |
| 19 | Malheur Lake | Harney | F | - | 807.5 µg/L | 45.5 µg/L |
| 20 | Mid-Trench Lake | Klamath | F | - | 240 µg/L | 80.6 µg/L |
| 21 | Agency Lake South | Klamath | F | - | 110 µg/L | 61.6 µg/L |
| 22 | Shoalwater Bay Lake | Klamath | F | - | 220 µg/L | 147 µg/L |
| 23 | Upper Klamath Lake | Klamath | F | - | 195 µg/L | 117 µg/L |
| 24 | Rattlesnake Point Lake | Klamath | F | - | 185 µg/L | 124.5 µg/L |
| 25 | Mid-North Lake | Klamath | F | - | 180 µg/L | 82.7 µg/L |