Big Sandy River Lake is a productive, nutrient-rich eutrophic lake in Benton County, Tennessee. Water quality is graded D based on 1 sampling years through 2026.
Source: EPA Water Quality Portal sampling records, Tennessee DNR, last sampled 2026-04-20. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
No clarity data. Phosphorus level: 64 µg/L. Trophic State Index: 64.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 64 µg/L | D |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 64 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Big Sandy River Lake
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Location
County Ranking
Ranked #1 of 1 lakes in Benton County
Cleaner Lakes Within 30 Miles
Big Sandy River Lake holds Grade D. One nearby lake has a higher grade.
Nearby Lakes in Benton County
Explore Big Sandy River Lake across LakeGrade
More Tennessee Lake Rankings
Other Grade D Lakes in Tennessee
Eutrophic 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: 2026-04-20
Monitoring stations: 1