Corbin City Reservoir
Laurel County, KentuckyView mapDirections
Nutrients and algae sit mid-range for this region.
- Eutrophic
- Impaired · Nutrients (phosphorus, nitrogen)
- #1 of 2 in the county
Corbin City Reservoir in Laurel County, Kentucky has a water quality grade of C (Fair). Phosphorus: 30 µg/L.
- Type
- Eutrophic
- Phosphorus
- 30 µg/L
- Trend
- ↓ Declining
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Watch Corbin City Reservoir’s letter
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Corbin City Reservoir is a productive, nutrient-rich eutrophic lake in Laurel County, Kentucky. Water quality is graded C based on 1 sampling years through 2023. Overall water quality is declining over recent sampling years. Compared to the 1 other monitored lakes in Laurel County, Corbin City Reservoir ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, KY DOW, last sampled 2023-09-20. 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. Corbin City Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), oxygen depletion (low DO). 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
Fishing Corbin City Reservoir
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | → Stable | +0.33 µg/L/yr | 4 |
| Chlorophyll-a | ↓ Declining | +14.8 µg/L/yr | 2 |
EPA Impairment Status
Corbin City 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-2690 · Official waterbody report
County Ranking
Ranked #1 of 2 lakes in Laurel County
Nearby Lakes in Laurel County
Frequently asked questions about Corbin City Reservoir
Where is Corbin City Reservoir?
- Corbin City Reservoir is a lake in Laurel County, Kentucky. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Corbin City Reservoir?
- Corbin City Reservoir in Laurel County, Kentucky has a water quality grade of C (Fair). Phosphorus: 30 µg/L.
Is Corbin City Reservoir safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Corbin City Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), oxygen depletion (low DO). Check local advisories before you swim.
Explore Corbin City Reservoir across LakeQuality
3 documented falls within 15.8 mi, nearest Vanhook Falls
Species activity outlook by water temperature and season
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High nutrients, frequent algae, reduced clarity
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Where this data comes from
30 measurements from 2 monitoring stations, 2015–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- KY WQX
21KY_WQX30 samples · 2015–2023
Analytical methods
- Phosphorus by Colorimetry
- Total Phosphorus After Block Digestion
- Turbidity by Nephelometry
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
Impairment status from EPA ATTAINS 303(d) database