Greenbo Lake
Greenup County, Kentucky181 acresView mapDirections
Nutrients and algae sit mid-range for this region.
↑ up from D at the last regrade
- Eutrophic
- #1 of 1 in the county
- Public access
Greenbo Lake in Greenup County, Kentucky has a water quality grade of C (Fair). Phosphorus: 30 µg/L. Surface area: 180.8 acres.
- Area
- 181 acres
- Type
- Eutrophic
- Phosphorus
- 30 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
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Watch Greenbo Lake’s letter
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Greenbo Lake is a 181-acre productive, nutrient-rich eutrophic lake in Greenup County, Kentucky. Water quality is graded C based on 1 sampling years through 2023. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, KY DOW, last sampled 2023-09-27. Grade methodology: LakeQuality methodology.
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)
No clarity data. Phosphorus 30 µg/L. TSI 53. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 30 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 181 acres |
| Public Access | Yes |
No bathymetric survey has been published for Greenbo Lake, so its depth is not documented here.
Fishing Greenbo Lake
Water Quality Trend: ↓ Declining
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +0.99 µg/L/yr | 3 |
Reservoir Info (USACE NID)
Greenbo Lake is a man-made reservoir impounded by the Greenbo Lake Dam (completed 1955), built primarily for recreation on the Clay Lick Creek; earth-type dam, 70 ft tall and 520 ft long.
- Surface area
- 180.8 ac
- Normal storage
- 5,002 ac-ft
- Max storage
- 8,329 ac-ft
- Drainage area
- 5.45 sq mi
- Hazard class
- High
- Owner
- COMMONWEALTH OF KENTUCKY
Source: USACE National Inventory of Dams, NID ID KY00039 · Operator website
County Ranking
Ranked #1 of 1 lakes in Greenup County
Nearby Lakes in Greenup County
Frequently asked questions about Greenbo Lake
Where is Greenbo Lake?
- Greenbo Lake is a lake in Greenup County, Kentucky. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Greenbo Lake?
- Greenbo Lake in Greenup County, Kentucky has a water quality grade of C (Fair). Phosphorus: 30 µg/L. Surface area: 180.8 acres.
Is Greenbo Lake safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Greenbo Lake across LakeQuality
More Kentucky Lake Rankings
Other Grade C Lakes in Kentucky
Eutrophic Lakes in Kentucky
Where this data comes from
48 measurements from 3 monitoring stations, 2012–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- KY WQX
21KY_WQX48 samples · 2012–2023
Analytical methods
- Phosphorus by Colorimetry
- Total Phosphorus After Block Digestion
- Turbidity by Nephelometry
Monitoring station identifiers (3)
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.