Lake Sidney Lanier is a productive, nutrient-rich eutrophic lake in Hall County, Georgia. Water quality is graded C based on 1 sampling years through 2025. Compared to the 3 other monitored lakes in Hall County, Lake Sidney Lanier ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Georgia DNR, last sampled 2025-10-01. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 6.6 ft. Chlorophyll-a: 13 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.6 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 13 µg/L | C |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Sidney Lanier
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Fishing Lake Sidney Lanier
Location
County Ranking
Ranked #3 of 4 lakes in Hall County
Nearby Lakes in Hall County
Explore Lake Sidney Lanier across LakeGrade
More Georgia Lake Rankings
Other Grade C Lakes in Georgia
Eutrophic Lakes in Georgia
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: 2025-10-01
Monitoring stations: 2