Cleanest Lakes in Broadwater County, Montana
Island Park Reservoir in Broadwater County leads the rankings with a water quality grade of B. Below are the top 3 cleanest monitored lakes in Broadwater County, Montana, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Island Park Reservoir | Broadwater | B | - | 23.5 µg/L | 6.3 µg/L |
| 2 | Canyon Ferry Lake | Broadwater | C | 8.9 ft | 34 µg/L | - |
| 3 | Canyon Ferry Lake | Broadwater | C | 4.3 ft | 27 µg/L | - |