Hillsborough-Keene Lake
Hillsborough County, Florida32 acresView mapDirections
Florida DEP publishes the water-quality measurements for Hillsborough-Keene Lake. Here is what has been measured.
- Eutrophic
- Limited data
Hillsborough-Keene Lake in Hillsborough County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3.3 ft visibility. Phosphorus: 29.5 µg/L. Surface area: 32 acres.
Hillsborough-Keene Lake is a 32-acre productive, nutrient-rich eutrophic lake in Hillsborough County, Florida. Overall water quality is improving over recent sampling years. Compared to the 123 other monitored lakes in Hillsborough County, Hillsborough-Keene Lake ranks #41 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-04-20. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
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 Hillsborough-Keene Lake is safe to swim in today is a call for the Florida Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Hillsborough-Keene Lake
These are the measurements Florida DEP publishes for Hillsborough-Keene Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 3.3 ft of visibility. Phosphorus 29.5 µg/L. TSI 57.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 29.5µg/L | Good 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. | 57 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Hillsborough-Keene Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
32 acres
No bathymetric survey has been published for Hillsborough-Keene Lake, so its depth is not documented here.
Stays via Stay22
Stays near Hillsborough-Keene Lake
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Fishing Hillsborough-Keene Lake
Water Quality Trend: Improving
Based on 5 years of monitoring (2020–2024).
Water clarity
Improving5 years
Phosphorus
Improving-1.5 µg/L/yr5 years
Reservoir Info (USACE NID)
Hillsborough-Keene Lake is a man-made reservoir impounded by the Keene Lake Water Conservation Structure #2, built primarily for flood risk reduction on the Keene Lake; earth-type dam, 7 ft tall and 30 ft long.
- Surface area
- 32 ac
- Normal storage
- 17 ac-ft
- Max storage
- 1,750 ac-ft
- Hazard class
- Significant
- Owner
- SWFWMD
All listed purposes: Flood Risk Reduction;Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID FL12034 · Operator website · Matched by proximity (0.24 km)
Nearby Lakes in Hillsborough County
Frequently asked questions about Hillsborough-Keene Lake
Where is Hillsborough-Keene Lake?
- Hillsborough-Keene Lake is a lake in Hillsborough County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Hillsborough-Keene Lake?
- Hillsborough-Keene Lake in Hillsborough County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3.3 ft visibility. Phosphorus: 29.5 µg/L. Surface area: 32 acres.
Is Hillsborough-Keene Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
39 measurements from 3 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX39 samples · 2020–2025
Monitoring station identifiers (3)
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.