Grapevine Lake
Hopkins County, Kentucky49 acresView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↑ up from C at the last regrade
- Mesotrophic
- #4 of 4 in the county
- 56 ft max depth
- Limited data
Grapevine Lake in Hopkins County, Kentucky has a water quality grade of B (Good). Phosphorus: 17.3 µg/L. Surface area: 48.5 acres.
- Max depth
- ~56 ft est.
- Area
- 49 acres
- Type
- Mesotrophic
- Phosphorus
- 17.3 µg/L
- Trend
- ↓ Declining
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Watch Grapevine Lake’s letter
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Grapevine Lake is a 49-acre mesotrophic lake in Hopkins County, Kentucky with an estimated average depth of about 56 feet. Water quality is graded B based on 1 sampling years through 2019. 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. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
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 B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: B (Good)
No clarity data. Phosphorus 17.3 µg/L. TSI 45. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 17.3 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~56 ft est. |
| Average Depth | ~12 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
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 Grapevine Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +4.07 µg/L/yr | 2 |
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
County Ranking
Ranked #4 of 4 lakes in Hopkins County
Nearby Lakes in Hopkins County
Frequently asked questions about Grapevine Lake
Where is Grapevine Lake?
- Grapevine Lake is a lake in Hopkins County, Kentucky. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Grapevine Lake?
- Grapevine Lake in Hopkins County, Kentucky has a water quality grade of B (Good). Phosphorus: 17.3 µg/L. Surface area: 48.5 acres.
Is Grapevine Lake safe to swim in?
- The B is nutrients and algae, 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
More Kentucky Lake Rankings
Other Grade B 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)
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
Lake size & watershed from HydroLAKES (HydroSHEDS)