Nla Lake is a productive, nutrient-rich eutrophic lake in Marshall County, Tennessee. Water quality is graded F based on 2 sampling years through 2017.
Source: EPA Water Quality Portal sampling records, Tennessee DNR, last sampled 2017-08-25. 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 2.1 ft of visibility. Phosphorus level: 107.8 µg/L. Chlorophyll-a: 60.3 µg/L. Trophic State Index: 70.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.1 ft | F |
| Phosphorus | 107.8 µg/L | F |
| Chlorophyll-a (Algae) | 60.3 µg/L | F |
| Trophic State Index (TSI) | 70 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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Location
County Ranking
Ranked #1 of 1 lakes in Marshall County
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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: 2017-08-25
Monitoring stations: 1