Lake Helena Outlet is a highly nutrient-loaded hypereutrophic lake in Lewis and Clark County, Montana. Water quality is graded F based on 1 sampling years through 2023. Compared to the 11 other monitored lakes in Lewis and Clark County, Lake Helena Outlet ranks #12 for water quality.
Source: EPA Water Quality Portal sampling records, Montana DNR, last sampled 2023-10-17. Grade methodology: LakeGrade methodology.
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
No clarity data. Phosphorus level: 115.5 µg/L. Trophic State Index: 73.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 115.5 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 73 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Lake Helena Outlet
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Fishing Lake Helena Outlet
Location
County Ranking
Ranked #12 of 12 lakes in Lewis and Clark County
Cleaner Lakes Within 30 Miles
Lake Helena Outlet holds Grade F. One nearby lake has a higher grade.
Nearby Lakes in Lewis and Clark County
Explore Lake Helena Outlet across LakeGrade
More Montana Lake Rankings
Other Grade F Lakes in Montana
Hypereutrophic Lakes in Montana
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-10-17
Monitoring stations: 1