Nla Lake is a productive, nutrient-rich eutrophic lake in Powell County, Montana. Water quality is graded C based on 2 sampling years through 2017. Compared to the 1 other monitored lakes in Powell County, Nla Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Montana DNR, last sampled 2017-08-13. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
No clarity data. Phosphorus level: 115.9 µg/L. Chlorophyll-a: 4.9 µg/L. Trophic State Index: 59.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 115.9 µg/L | F |
| Chlorophyll-a (Algae) | 4.9 µg/L | A |
| Trophic State Index (TSI) | 59 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Nla Lake
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Fishing Nla Lake
Location
County Ranking
Ranked #2 of 2 lakes in Powell County
Cleaner Lakes Within 30 Miles
Nla Lake holds Grade C. 3 nearby lakes hold higher grades.
- AElbow LakePowell County · 0.8 mi · Two grade letters higher (C → A)
- ABig Sky Lake South HoleMissoula County · 8.7 mi · Two grade letters higher (C → A)
- ASalmon Lake Mid-North BasinMissoula County · 8.8 mi · Two grade letters higher (C → A)
Nearby Lakes in Powell County
Explore Nla Lake across LakeGrade
More Montana Lake Rankings
Other Grade C 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: 2017-08-13
Monitoring stations: 1