South Deep Creek @ E Longtown Lake is a productive, nutrient-rich eutrophic lake in Yadkin County, North Carolina. Water quality is graded D based on 1 sampling years through 2024. Compared to the 4 other monitored lakes in Yadkin County, South Deep Creek @ E Longtown Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, North Carolina DNR, last sampled 2024-03-07. 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: 80 µg/L. Trophic State Index: 67.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 80 µg/L | D |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 67 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near South Deep Creek @ E Longtown Lake
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Fishing South Deep Creek @ E Longtown Lake
Location
County Ranking
Ranked #5 of 5 lakes in Yadkin County
Cleaner Lakes Within 30 Miles
South Deep Creek @ E Longtown Lake holds Grade D. One nearby lake has a higher grade.
Nearby Lakes in Yadkin County
Explore South Deep Creek @ E Longtown Lake across LakeGrade
More North Carolina Lake Rankings
Top 25 by overall water quality score
Top 25 by Secchi water clarity
Grade A/B + low algae filter
Panfish-rich, public access
Full state directory
Other Grade D Lakes in North Carolina
Eutrophic Lakes in North Carolina
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: 2024-03-07
Monitoring stations: 1