Lake Oconee
Greene County, GeorgiaView mapDirections
Nutrients and algae sit mid-range for this region.
- Eutrophic
- #1 of 2 in the county
- Public access
Lake Oconee in Greene County, Georgia has a water quality grade of C (Fair). Water clarity: 5.6 ft visibility. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 12.9 µg/L.
- Clarity
- 5.6 ft
- Type
- Eutrophic
- Phosphorus
- 20 µg/L
- Chlorophyll-a
- 12.9 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
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Watch Lake Oconee’s letter
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Lake Oconee is a productive, nutrient-rich eutrophic lake in Greene County, Georgia. Water quality is graded C based on 2 sampling years through 2025. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 2 public boat landings. Compared to the 1 other monitored lakes in Greene County, Lake Oconee ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Georgia EPD, last sampled 2025-10-08. Grade methodology: LakeQuality methodology.
What Lake Oconee is good for
From access and monitoring records, not editorial picks.
- Boat launch2 documented ramps
Swimming Safety
Grade onlyModerate
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The C is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: C (Fair)
Murky, only visible to about 5.6 ft. Phosphorus 20 µg/L. Chlorophyll-a 12.9 µg/L. TSI 52. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.6 ft | Not graded |
| Phosphorus | 20 µg/L | Fair |
| Chlorophyll-a (Algae) | 12.9 µg/L | Fair |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Recreation & Access
- Long ShoalsPublic
- Double BranchesPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Oconee
Water Quality Trend: ↓ Declining
Based on 13 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.024 m/yr | 13 |
| Phosphorus | → Stable | +0.3 µg/L/yr | 6 |
| Chlorophyll-a | ↓ Declining | +0.32 µg/L/yr | 13 |
County Ranking
Ranked #1 of 2 lakes in Greene County
Nearby Lakes in Greene County
Frequently asked questions about Lake Oconee
Where is Lake Oconee?
- Lake Oconee is a lake in Greene County, Georgia. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Oconee?
- Lake Oconee in Greene County, Georgia has a water quality grade of C (Fair). Water clarity: 5.6 ft visibility. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 12.9 µg/L.
Is Lake Oconee safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Lake Oconee?
- Lake Oconee has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Long Shoals, Double Branches. Public access is listed as yes.
Explore Lake Oconee across LakeQuality
More Georgia Lake Rankings
Other Grade C Lakes in Georgia
Eutrophic Lakes in Georgia
Where this data comes from
232 measurements from 1 monitoring station, 2012–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Georgia DNR Environmental Protection Division
21GAEPD_WQX232 samples · 2012–2025
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- Turbidity by Nephelometry
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.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory