Little Terrapin Branch Unnamed Tributary Impoundment Lake
Maury County, TennesseeView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Limited data
Little Terrapin Branch Unnamed Tributary Impoundment Lake in Maury County, Tennessee is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 311 µg/L.
- Phosphorus
- 311 µg/L
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Watch Little Terrapin Branch Unnamed Tributary Impoundment Lake’s letter
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Why Little Terrapin Branch Unnamed Tributary Impoundment Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Little Terrapin Branch Unnamed Tributary Impoundment Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by TDEC and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Little Terrapin Branch Unnamed Tributary Impoundment Lake is a lake in Maury County, Tennessee.
Source: EPA Water Quality Portal sampling records, TDEC, last sampled 2026-06-11. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
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Water quality measurements for Little Terrapin Branch Unnamed Tributary Impoundment Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 311 µg/L. TSI 87.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 311 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 87 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Fishing Little Terrapin Branch Unnamed Tributary Impoundment Lake
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Frequently asked questions about Little Terrapin Branch Unnamed Tributary Impoundment Lake
Where is Little Terrapin Branch Unnamed Tributary Impoundment Lake?
- Little Terrapin Branch Unnamed Tributary Impoundment Lake is a lake in Maury County, Tennessee. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Little Terrapin Branch Unnamed Tributary Impoundment Lake?
- Little Terrapin Branch Unnamed Tributary Impoundment Lake in Maury County, Tennessee is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 311 µg/L.
Is Little Terrapin Branch Unnamed Tributary Impoundment Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
1 measurement from 1 monitoring station, 2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- TDEC Division of Water Resources
TDECWR_WQX1 sample · 2026
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.