Nla Lake is a highly nutrient-loaded hypereutrophic lake in Valley County, Montana. Water quality is graded F based on 3 sampling years through 2017. Compared to the 4 other monitored lakes in Valley County, Nla Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Montana DNR, last sampled 2017-07-11. 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
Very murky, less than 1 ft of visibility. Phosphorus level: 336.5 µg/L. Chlorophyll-a: 137 µg/L. Trophic State Index: 81.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1 ft | F |
| Phosphorus | 336.5 µg/L | F |
| Chlorophyll-a (Algae) | 137 µg/L | F |
| Trophic State Index (TSI) | 81 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
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Fishing Nla Lake
Location
County Ranking
Ranked #5 of 5 lakes in Valley County
Cleaner Lakes Within 30 Miles
Nla Lake holds Grade F. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Valley County
Explore Nla Lake across LakeGrade
More Montana Lake Rankings
Other Grade F 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: 2017-07-11
Monitoring stations: 1