Clark Canyon Reservoir South of Island is a productive, nutrient-rich eutrophic lake in Beaverhead County, Montana. Water quality is graded D based on 1 sampling years through 2016. Compared to the 4 other monitored lakes in Beaverhead County, Clark Canyon Reservoir South of Island ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Montana DNR, last sampled 2016-06-17. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 4.9 ft. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.9 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Clark Canyon Reservoir South of Island
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Fishing Clark Canyon Reservoir South of Island
Location
County Ranking
Ranked #5 of 5 lakes in Beaverhead County
Cleaner Lakes Within 30 Miles
Clark Canyon Reservoir South of Island holds Grade D. One nearby lake has a higher grade.
Nearby Lakes in Beaverhead County
Explore Clark Canyon Reservoir South of Island across LakeGrade
More Montana Lake Rankings
Other Grade D Lakes in Montana
Eutrophic 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: 2016-06-17
Monitoring stations: 1