Long Run Lake
Jefferson County, Kentucky27 acresView mapDirections
Nutrients and algae sit mid-range for this region.
- Eutrophic
- #1 of 1 in the county
- Public access
Long Run Lake in Jefferson County, Kentucky has a water quality grade of C (Fair). Phosphorus: 30 µg/L. Surface area: 27 acres.
- Area
- 27 acres
- Type
- Eutrophic
- Phosphorus
- 30 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
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Watch Long Run Lake’s letter
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Long Run Lake is a 27-acre productive, nutrient-rich eutrophic lake in Jefferson 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.
Source: EPA Water Quality Portal sampling records, KY DOW, last sampled 2022-09-08. Grade methodology: LakeQuality methodology.
What Long Run 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. 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 | 27 acres |
| Public Access | Yes |
No bathymetric survey has been published for Long Run Lake, so its depth is not documented here.
Recreation & Access
- Long Run ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Long Run Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +2.5 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Long Run Lake is a man-made reservoir impounded by the Long Run Park Lake Dam (completed 1968), built primarily for recreation on the Floyds Fork; earth-type dam, 43 ft tall and 1,050 ft long.
- Surface area
- 27 ac
- Normal storage
- 352 ac-ft
- Max storage
- 475 ac-ft
- Drainage area
- 0.34 sq mi
- Hazard class
- Significant
- Owner
- LOUISVILLE METRO PARKS
Source: USACE National Inventory of Dams, NID ID KY00301 · Operator website · Matched by proximity (0.14 km)
County Ranking
Ranked #1 of 1 lakes in Jefferson County
Nearby Lakes in Jefferson County
Frequently asked questions about Long Run Lake
Where is Long Run Lake?
- Long Run Lake is a lake in Jefferson County, Kentucky. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Long Run Lake?
- Long Run Lake in Jefferson County, Kentucky has a water quality grade of C (Fair). Phosphorus: 30 µg/L. Surface area: 27 acres.
Is Long Run Lake safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Long Run Lake?
- Long Run Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Long Run Park. Public access is listed as yes.
Explore Long Run Lake across LakeQuality
More Kentucky Lake Rankings
Other Grade C Lakes in Kentucky
Eutrophic Lakes in Kentucky
Where this data comes from
18 measurements from 2 monitoring stations, 2014–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- KY WQX
21KY_WQX18 samples · 2014–2022
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
Named boat-access points from the USGS National Boat Ramps inventory