Greenbrier Creek Reservoir
Montgomery County, KentuckyView mapDirections
Nutrients and algae sit mid-range for this region.
- Eutrophic
- Impaired · Nutrients (phosphorus, nitrogen)
- #1 of 1 in the county
- 32 ft max depth
Greenbrier Creek Reservoir in Montgomery County, Kentucky has a water quality grade of C (Fair). Phosphorus: 30 µg/L.
- Max depth
- ~32 ft est.
- Type
- Eutrophic
- Phosphorus
- 30 µg/L
- Trend
- ↓ Declining
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Watch Greenbrier Creek Reservoir’s letter
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Greenbrier Creek Reservoir is a productive, nutrient-rich eutrophic lake in Montgomery County, Kentucky with an estimated average depth of about 32 feet. Water quality is graded C based on 1 sampling years through 2022. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, KY DOW, last sampled 2022-09-06. 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. Greenbrier Creek Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). 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 |
|---|---|
| Maximum Depth | ~32 ft est. |
| Average Depth | ~14 ft est. |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Kentucky has not published bathymetry for Greenbrier Creek Reservoir.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Greenbrier Creek Reservoir
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +3.46 µg/L/yr | 2 |
EPA Impairment Status
Greenbrier Creek Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit KY-860 · Official waterbody report · Matched by proximity (0.42 km)
County Ranking
Ranked #1 of 1 lakes in Montgomery County
Nearby Lakes in Montgomery County
Frequently asked questions about Greenbrier Creek Reservoir
Where is Greenbrier Creek Reservoir?
- Greenbrier Creek Reservoir is a lake in Montgomery County, Kentucky. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Greenbrier Creek Reservoir?
- Greenbrier Creek Reservoir in Montgomery County, Kentucky has a water quality grade of C (Fair). Phosphorus: 30 µg/L.
Is Greenbrier Creek Reservoir safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Greenbrier Creek Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Greenbrier Creek Reservoir?
- No published bathymetric survey covers Greenbrier Creek Reservoir, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 32 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Greenbrier Creek Reservoir across LakeQuality
More Kentucky Lake Rankings
Other Grade C Lakes in Kentucky
Eutrophic Lakes in Kentucky
Where this data comes from
24 measurements from 3 monitoring stations, 2014–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- KY WQX
21KY_WQX24 samples · 2014–2022
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)