Nla Lake is a highly nutrient-loaded hypereutrophic lake in Polk County, Tennessee. Water quality is graded C based on 2 sampling years through 2012. Compared to the 2 other monitored lakes in Polk County, Nla Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Tennessee DNR, last sampled 2012-09-19. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Crystal clear, you can see 16.4 ft down. Phosphorus level: 21000 µg/L. Chlorophyll-a: 2.4 µg/L. Trophic State Index: 74.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 16.4 ft | A |
| Phosphorus | 21000 µg/L | F |
| Chlorophyll-a (Algae) | 2.4 µg/L | A |
| Trophic State Index (TSI) | 74 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
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Fishing Nla Lake
Location
County Ranking
Ranked #3 of 3 lakes in Polk County
Cleaner Lakes Within 30 Miles
Nla Lake holds Grade C. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Polk County
Explore Nla Lake across LakeGrade
More Tennessee Lake Rankings
Other Grade C Lakes in Tennessee
Hypereutrophic Lakes in Tennessee
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: 2012-09-19
Monitoring stations: 1