South Deep Creek @ E Longtown Lake
Yadkin County, North CarolinaView 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
South Deep Creek @ E Longtown Lake in Yadkin County, North Carolina is not rated for water quality — its monitoring record does not meet the evidence bar.
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Watch South Deep Creek @ E Longtown Lake’s letter
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Why South Deep Creek @ E Longtown 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 South Deep Creek @ E Longtown Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
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 NCDEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
South Deep Creek @ E Longtown Lake is a lake in Yadkin County, North Carolina.
Source: EPA Water Quality Portal sampling records, NCDEQ, last sampled 2024-03-07. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for South Deep Creek @ E Longtown Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Fishing South Deep Creek @ E Longtown Lake
Graded lakes near South Deep Creek @ E Longtown Lake
South Deep Creek @ E Longtown Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Yadkin County
Frequently asked questions about South Deep Creek @ E Longtown Lake
Where is South Deep Creek @ E Longtown Lake?
- South Deep Creek @ E Longtown Lake is a lake in Yadkin County, North Carolina. 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 South Deep Creek @ E Longtown Lake?
- South Deep Creek @ E Longtown Lake in Yadkin County, North Carolina is not rated for water quality — its monitoring record does not meet the evidence bar.
Is South Deep Creek @ E Longtown Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore South Deep Creek @ E Longtown Lake across LakeQuality
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Where this data comes from
6 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North Carolina Dept of Environmental Quality NCDEQ-DWR WQX
21NC03WQ6 samples · 2024
Analytical methods
- Phosphorus by Colorimetry
- 2130 B ~ Nephelometric Method
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.