Rockcastle County, Kentucky · 37.39°N · Water Quality Report Card
Lake Linville
Lake Linville in Rockcastle County, Kentucky has a water quality grade of C (Fair). Phosphorus: 30 µg/L.
- Mean depth
- ~37 ft est.
- Type
- Eutrophic
- Trend
- ↓ Declining
Lake Linville is a productive, nutrient-rich eutrophic lake in Rockcastle County, Kentucky with an estimated average depth of about 37 feet. Water quality is graded C based on 1 sampling years through 2021. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, KY DOW, last sampled 2021-10-27. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
No clarity data. Phosphorus level: 30 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 30 µg/L | Fair |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~37 ft est. |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Kentucky has not published bathymetry for Lake Linville.
Where to stay near Lake Linville
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Fishing Lake Linville
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.08 m/yr | 2 |
| Phosphorus | ↓ Declining | +2.31 µg/L/yr | 3 |
Location
County Ranking
Ranked #1 of 1 lakes in Rockcastle County
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Explore Lake Linville across LakeGrade
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More records, surveys & data sources
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.
Where this data comes from
115 measurements from 6 monitoring stations, 2013–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- KY WQX
21KY_WQX115 samples · 2013–2021
Analytical methods
- Phosphorus by Colorimetry
- Total Phosphorus After Block Digestion
- Turbidity by Nephelometry
Monitoring station identifiers (6)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2021-10-27
Monitoring stations: 6