Lake Blackshear is a productive, nutrient-rich eutrophic lake in Sumter County, Georgia. Water quality is graded C based on 1 sampling years through 2025. Compared to the 1 other monitored lakes in Sumter County, Lake Blackshear ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Georgia DNR, last sampled 2025-10-27. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Very murky, less than 2.9 ft of visibility. Chlorophyll-a: 10 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.9 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 10 µg/L | C |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Blackshear
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Fishing Lake Blackshear
Location
County Ranking
Ranked #1 of 2 lakes in Sumter County
Nearby Lakes in Sumter County
Explore Lake Blackshear 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: 2025-10-27
Monitoring stations: 1