Long Run Lake
Jefferson County, Kentucky27 acresView mapDirections
Kentucky DOW publishes the water-quality measurements for Long Run Lake. Here is what has been measured.
- Eutrophic
- Public access
Long Run Lake in Jefferson County, Kentucky has water-quality measurements published by Kentucky DOW, shown here as reported. Phosphorus: 30 µg/L. Surface area: 27 acres.
Long Run Lake is a 27-acre productive, nutrient-rich eutrophic lake in Jefferson County, Kentucky. 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. Methodology: how these readings are compared.
What Long Run Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
Readings onlyModerate algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Long Run Lake is safe to swim in today is a call for the Kentucky Division of Water and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Long Run Lake
These are the measurements Kentucky DOW publishes for Long Run Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 30 µg/L. TSI 53.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 30µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 53 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Long Run Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
27 acres
Public access
Yes
Listed by Kentucky DOW
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
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Stays near Long Run Lake
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Fishing Long Run Lake
Water quality readings over time
2 seasons of samples on record (2014–2022). Calling a direction takes at least 4 years of the same measurement.
Phosphorus
Worsening+2.5 µg/L/yr2 years
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)
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. Its water-quality measurements are published by Kentucky DOW and shown on this page as reported.
What is the water quality of Long Run Lake?
- Long Run Lake in Jefferson County, Kentucky has water-quality measurements published by Kentucky DOW, shown here as reported. Phosphorus: 30 µg/L. Surface area: 27 acres.
Is Long Run Lake safe to swim in?
- Nutrient and algae readings are 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.
Can I fish at Long Run Lake?
- Long Run Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Kentucky's fish and wildlife agency, so check its current regulations before you go.
Explore Long Run Lake across LakeQuality
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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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory