Little Terrapin Branch Unnamed Tributary Impoundment Lake is a highly nutrient-loaded hypereutrophic lake in Maury County, Tennessee. Water quality is graded F based on 1 sampling years through 2026. Compared to the 1 other monitored lakes in Maury County, Little Terrapin Branch Unnamed Tributary Impoundment Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Tennessee DNR, last sampled 2026-06-11. 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
No clarity data. Phosphorus level: 311 µg/L. Trophic State Index: 87.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 311 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 87 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Little Terrapin Branch Unnamed Tributary Impoundment Lake
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Fishing Little Terrapin Branch Unnamed Tributary Impoundment Lake
Location
County Ranking
Ranked #2 of 2 lakes in Maury County
Nearby Lakes in Maury County
Explore Little Terrapin Branch Unnamed Tributary Impoundment Lake across LakeGrade
More Tennessee Lake Rankings
Other Grade F 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: 2026-06-11
Monitoring stations: 1