Greenbrier Creek Reservoir
Montgomery County, KentuckyView mapDirections
Kentucky DOW publishes the water-quality measurements for Greenbrier Creek Reservoir. Here is what has been measured.
- Eutrophic
- 32 ft max depth
Greenbrier Creek Reservoir in Montgomery County, Kentucky has water-quality measurements published by Kentucky DOW, shown here as reported. Phosphorus: 30 µg/L.
Greenbrier Creek Reservoir is a productive, nutrient-rich eutrophic lake in Montgomery County, Kentucky with an estimated average depth of about 32 feet. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, KY DOW, last sampled 2022-09-06. Methodology: how these readings are compared.
Swimming conditions
Readings onlyModerate algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Greenbrier Creek Reservoir is safe to swim in today is a call for the Kentucky Division of Water and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Greenbrier Creek Reservoir
These are the measurements Kentucky DOW publishes for Greenbrier Creek Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 30 µg/L. TSI 53.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 30µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 53 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Greenbrier Creek Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~32 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
Watershed (drainage) area
5 sq mi
HydroLAKES / HydroSHEDS
Surface area
106 acres
HydroLAKES / HydroSHEDS
Shoreline
4 mi
HydroLAKES / HydroSHEDS
Elevation
843 ft
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.
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Fishing Greenbrier Creek Reservoir
Water quality readings over time
2 seasons of samples on record (2014–2022). Calling a direction takes at least 4 years of the same measurement.
Phosphorus
Worsening+3.46 µg/L/yr2 years
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. Its water-quality measurements are published by Kentucky DOW and shown on this page as reported.
What is the water quality of Greenbrier Creek Reservoir?
- Greenbrier Creek Reservoir in Montgomery County, Kentucky has water-quality measurements published by Kentucky DOW, shown here as reported. Phosphorus: 30 µg/L.
Is Greenbrier Creek Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. 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.
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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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)