Nla Lake is a highly nutrient-loaded hypereutrophic lake in Blaine County, Montana. Water quality is graded F based on 3 sampling years through 2017. Compared to the 3 other monitored lakes in Blaine County, Nla Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Montana DNR, last sampled 2017-09-06. 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 0.5 ft of visibility. Phosphorus level: 485.3 µg/L. Chlorophyll-a: 367.2 µg/L. Trophic State Index: 90.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.5 ft | F |
| Phosphorus | 485.3 µg/L | F |
| Chlorophyll-a (Algae) | 367.2 µg/L | F |
| Trophic State Index (TSI) | 90 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
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Fishing Nla Lake
Location
County Ranking
Ranked #3 of 4 lakes in Blaine County
Cleaner Lakes Within 30 Miles
Nla Lake holds Grade F. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Blaine County
Explore Nla Lake 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: 2017-09-06
Monitoring stations: 1