Cleanest Lakes in Polk County, Iowa
Terra Park Lake in Polk County leads the rankings with a water quality grade of A and 11.5 ft of clarity. Below are the top 10 cleanest monitored lakes in Polk County, Iowa, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Terra Park Lake | Polk | A | 11.5 ft | 20 µg/L | 4.7 µg/L |
| 2 | Lake Petocka | Polk | C | 3.3 ft | 39.5 µg/L | 9.3 µg/L |
| 3 | Thomas Mitchell Lake | Polk | C | 3.3 ft | 87 µg/L | 13.2 µg/L |
| 4 | Easter Lake | Polk | D | 2.9 ft | 49.5 µg/L | 22.8 µg/L |
| 5 | Big Creek Lake | Polk | F | 2.6 ft | 80 µg/L | 35.7 µg/L |
| 6 | Grays Lake | Polk | F | 1.6 ft | 103 µg/L | 46.5 µg/L |
| 7 | Blue Heron Lake | Polk | F | 2.2 ft | 78.5 µg/L | 57.9 µg/L |
| 8 | Fort des Moines Park Pond | Polk | F | 2.8 ft | 68 µg/L | 32.6 µg/L |
| 9 | Brenton Slough | Polk | NR | - | - | - |
| 10 | Saylorville Lake | Polk | NR | - | - | - |
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