Grapevine Lake
Hopkins County, Kentucky49 acresView mapDirections
Kentucky DOW publishes the water-quality measurements for Grapevine Lake. Here is what has been measured.
- Mesotrophic
- 56 ft max depth
- Limited data
Grapevine Lake in Hopkins County, Kentucky has water-quality measurements published by Kentucky DOW, shown here as reported. Phosphorus: 17.3 µg/L. Surface area: 48.5 acres.
Grapevine Lake is a 49-acre mesotrophic lake in Hopkins County, Kentucky with an estimated average depth of about 56 feet. Overall water quality is declining over recent sampling years. Compared to the 3 other monitored lakes in Hopkins County, Grapevine Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, KY DOW, last sampled 2019-09-03. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
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 Grapevine Lake 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 Grapevine Lake
These are the measurements Kentucky DOW publishes for Grapevine Lake, 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 17.3 µg/L. TSI 45.
| 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 | 17.3µg/L | Good 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. | 45 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Grapevine Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~56 ft est.
Surface area
49 acres
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Kentucky has not published bathymetry for Grapevine Lake.
Lake Size & Watershed
Watershed (drainage) area
0 sq mi
HydroLAKES / HydroSHEDS
Shoreline
1.2 mi
HydroLAKES / HydroSHEDS
Elevation
459 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 Grapevine Lake
Water quality readings over time
2 seasons of samples on record (2016–2019). Calling a direction takes at least 4 years of the same measurement.
Phosphorus
Worsening+4.07 µg/L/yr2 years
Reservoir Info (USACE NID)
Grapevine Lake is a man-made reservoir impounded by the Madisonville Reservoir 3 Dam (completed 1930), built primarily for recreation on the Pond River; earth-type dam, 30 ft tall and 850 ft long.
- Surface area
- 48.5 ac
- Normal storage
- 429.9 ac-ft
- Max storage
- 459 ac-ft
- Drainage area
- 0.3 sq mi
- Hazard class
- Significant
- Owner
- CITY OF MADISONVILLE
Source: USACE National Inventory of Dams, NID ID KY00144 · Operator website
Nearby Lakes in Hopkins County
Frequently asked questions about Grapevine Lake
Where is Grapevine Lake?
- Grapevine Lake is a lake in Hopkins County, Kentucky. Its water-quality measurements are published by Kentucky DOW and shown on this page as reported.
What is the water quality of Grapevine Lake?
- Grapevine Lake in Hopkins County, Kentucky has water-quality measurements published by Kentucky DOW, shown here as reported. Phosphorus: 17.3 µg/L. Surface area: 48.5 acres.
Is Grapevine Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Grapevine Lake?
- No published bathymetric survey covers Grapevine Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 56 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 48.5 acres.
Explore Grapevine Lake across LakeQuality
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Other Lakes in Kentucky
Mesotrophic Lakes in Kentucky
Where this data comes from
10 measurements from 2 monitoring stations, 2016–2019. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- KY WQX
21KY_WQX10 samples · 2016–2019
Analytical methods
- Phosphorus by Colorimetry
- Total Phosphorus After Block Digestion
Monitoring station identifiers (2)
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)