Corinth Lake
Grant County, Kentucky96 acresView mapDirections
Nutrients and algae sit mid-range for this region.
- Eutrophic
- Impaired · Mercury
- #1 of 3 in the county
- Public access
Corinth Lake in Grant County, Kentucky has a water quality grade of C (Fair). Phosphorus: 30 µg/L. Surface area: 95.5 acres.
- Area
- 96 acres
- Type
- Eutrophic
- Phosphorus
- 30 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
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Watch Corinth Lake’s letter
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Corinth Lake is a 96-acre productive, nutrient-rich eutrophic lake in Grant County, Kentucky. Water quality is graded C based on 1 sampling years through 2022. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 2 other monitored lakes in Grant County, Corinth Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, KY DOW, last sampled 2022-09-07. Grade methodology: LakeQuality methodology.
What Corinth Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
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. Corinth Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, nutrients (phosphorus, nitrogen). 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
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 96 acres |
| Public Access | Yes |
No bathymetric survey has been published for Corinth Lake, so its depth is not documented here.
Recreation & Access
- Corinth LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Corinth Lake
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +2.72 µg/L/yr | 4 |
Reservoir Info (USACE NID)
Corinth Lake is a man-made reservoir impounded by the Corinth Lake Dam (completed 1962), built primarily for recreation on the Eagle Creek; earth-type dam, 67 ft tall and 1,100 ft long.
- Surface area
- 95.5 ac
- Normal storage
- 1,612.5 ac-ft
- Max storage
- 3,300 ac-ft
- Drainage area
- 1.2 sq mi
- Hazard class
- High
- Owner
- KENTUCKY TRANSPORTATION CABINET
Source: USACE National Inventory of Dams, NID ID KY00051 · Operator website
EPA Impairment Status
Corinth Lake 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-34 · Official waterbody report
County Ranking
Ranked #1 of 3 lakes in Grant County
Nearby Lakes in Grant County
Frequently asked questions about Corinth Lake
Where is Corinth Lake?
- Corinth Lake is a lake in Grant County, Kentucky. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Corinth Lake?
- Corinth Lake in Grant County, Kentucky has a water quality grade of C (Fair). Phosphorus: 30 µg/L. Surface area: 95.5 acres.
Is Corinth Lake safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Corinth Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Are there boat ramps on Corinth Lake?
- Corinth Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Corinth Lake. Public access is listed as yes.
Explore Corinth Lake across LakeQuality
More Kentucky Lake Rankings
Other Grade C Lakes in Kentucky
Eutrophic Lakes in Kentucky
Where this data comes from
22 measurements from 2 monitoring stations, 2013–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- KY WQX
21KY_WQX22 samples · 2013–2022
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
Named boat-access points from the USGS National Boat Ramps inventory