Cleanest Lakes in Monona County, Iowa
Oldham Lake in Monona County leads the rankings with a water quality grade of C and 5.1 ft of clarity. Below are the top 2 cleanest monitored lakes in Monona County, Iowa, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Oldham Lake | Monona | C | 5.1 ft | - | 8.5 µg/L |
| 2 | Blue Lake | Monona | F | 0.9 ft | - | 37 µg/L |