Lake Sinclair
Baldwin County, Georgia15,330 acresView mapDirections
Nutrients and algae sit mid-range for this region.
- Eutrophic
- #1 of 1 in the county
Lake Sinclair in Baldwin County, Georgia has a water quality grade of C (Fair). Water clarity: 4.9 ft visibility. Phosphorus: 25 µg/L. Chlorophyll-a (algae): 12 µg/L. Surface area: 15330 acres.
- Clarity
- 4.9 ft
- Area
- 15,330 acres
- Type
- Eutrophic
- Phosphorus
- 25 µg/L
- Chlorophyll-a
- 12 µg/L
- Trend
- ↓ Declining
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Watch Lake Sinclair’s letter
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Lake Sinclair is a 15,330-acre productive, nutrient-rich eutrophic lake in Baldwin County, Georgia. Water quality is graded C based on 2 sampling years through 2025. Overall water quality is declining over recent sampling years. Public access is available with 6 public boat landings.
Source: EPA Water Quality Portal sampling records, Georgia EPD, last sampled 2025-10-09. Grade methodology: LakeQuality methodology.
What Lake Sinclair is good for
From access and monitoring records, not editorial picks.
- Boat launch6 documented ramps
- Big water15,330 acres
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 4.9 ft. Phosphorus 25 µg/L. Chlorophyll-a 12 µg/L. TSI 53. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.9 ft | Not graded |
| Phosphorus | 25 µg/L | Fair |
| Chlorophyll-a (Algae) | 12 µg/L | Fair |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 15,330 acres |
No bathymetric survey has been published for Lake Sinclair, so its depth is not documented here.
Recreation & Access
- Little River Park MarinaSemi-private
- T D Cheek Public Fishing AreaSemi-private
- Sunset Marina and InnSemi-private
- Lake Side Bait and TackleSemi-private
- Jere Shai LakesideSemi-private
- Sinclair MarinaSemi-private
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Sinclair
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.035 m/yr | 5 |
| Phosphorus | ↓ Declining | +0.79 µg/L/yr | 5 |
| Chlorophyll-a | ↓ Declining | +1.04 µg/L/yr | 5 |
Reservoir Info (USACE NID)
Lake Sinclair is a man-made reservoir impounded by the Sinclair (completed 1953), built primarily for hydroelectric on the Oconee; gravity-type dam, 105 ft tall and 2,988 ft long.
- Surface area
- 15,330 ac
- Normal storage
- 333,000 ac-ft
- Max storage
- 490,000 ac-ft
- Drainage area
- 2,910 sq mi
- Hazard class
- High
- Owner
- Georgia Power Company
All listed purposes: Hydroelectric;Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID GA00836 · Operator website
County Ranking
Ranked #1 of 1 lakes in Baldwin County
Nearby Lakes in Baldwin County
Frequently asked questions about Lake Sinclair
Where is Lake Sinclair?
- Lake Sinclair is a lake in Baldwin 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 Sinclair?
- Lake Sinclair in Baldwin County, Georgia has a water quality grade of C (Fair). Water clarity: 4.9 ft visibility. Phosphorus: 25 µg/L. Chlorophyll-a (algae): 12 µg/L. Surface area: 15330 acres.
Is Lake Sinclair 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 Sinclair?
- Lake Sinclair has 6 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Little River Park Marina, T D Cheek Public Fishing Area, Sunset Marina and Inn, Lake Side Bait and Tackle, among others.
Explore Lake Sinclair across LakeQuality
More Georgia Lake Rankings
Other Grade C Lakes in Georgia
Eutrophic Lakes in Georgia
Where this data comes from
844 measurements from 4 monitoring stations, 2012–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Georgia DNR Environmental Protection Division
21GAEPD_WQX844 samples · 2012–2025
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- Turbidity by Nephelometry
Monitoring station identifiers (4)
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