Cleanest Lakes in Lewis and Clark County, Montana
Lake Helena Outlet in Lewis and Clark County leads the rankings on measured clarity and nutrients. Below are the top 13 cleanest monitored lakes in Lewis and Clark County, Montana, ranked on EPA nutrient and algae measurements.
Ranked List
| # | Lake | County | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|
| 1 | Lake Helena Outlet | Lewis and Clark | - | 115.5 µg/L | - |
| 2 | Helena Valley Regulating Reservoir | Lewis and Clark | - | - | - |
| 3 | Heart Lake | Lewis and Clark | - | - | - |
| 4 | Gravelly Range Lake | Lewis and Clark | - | - | - |
| 5 | Chessman Reservoir | Lewis and Clark | - | - | - |
| 6 | Scott Reservoir | Lewis and Clark | - | - | - |
| 7 | Connors Lake | Lewis and Clark | - | - | - |
| 8 | Smith Lake | Lewis and Clark | - | - | - |
| 9 | Nilan Reservoir | Lewis and Clark | - | - | - |
| 10 | Anderson Lake | Lewis and Clark | - | - | - |
| 11 | Krone Lake | Lewis and Clark | - | - | - |
| 12 | Meyer Lake | Lewis and Clark | - | - | - |
| 13 | Bean Lake | Lewis and Clark | - | - | - |
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