Hillsborough-Keene Lake
Hillsborough-Keene Lake in Hillsborough County, Florida has a water quality grade of B (Good). Water clarity: 3.3 ft visibility. Phosphorus: 29.5 µg/L. Surface area: 32 acres.
- Clarity
- 3.3 ft
- Area
- 32 acres
- Type
- Eutrophic
- Trend
- ↑ Improving
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Hillsborough-Keene Lake is a 32-acre productive, nutrient-rich eutrophic lake in Hillsborough County, Florida. Water quality is graded B based on 1 sampling years through 2025. 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. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyBacteria advisory
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.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Very murky, less than 3.3 ft of visibility. Phosphorus level: 29.5 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.3 ft | Not graded |
| Phosphorus | 29.5 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Hillsborough-Keene Lake
Compare lakeside cabins, hotels, and vacation rentals near Hillsborough-Keene Lake in Hillsborough County, Florida — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Hillsborough-Keene Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 32 acres |
No bathymetric survey has been published for Hillsborough-Keene Lake, so its depth is not documented here.
Fishing Hillsborough-Keene Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.4 m/yr | 5 |
| Phosphorus | ↑ Improving | -1.5 µg/L/yr | 5 |
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)
EPA Impairment Status
Hillsborough-Keene Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit FL1451 · Official waterbody report · Matched by proximity (0.94 km)
County Ranking
Ranked #41 of 124 lakes in Hillsborough County
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. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Hillsborough-Keene Lake?
- Hillsborough-Keene Lake in Hillsborough County, Florida has a water quality grade of B (Good). Water clarity: 3.3 ft visibility. Phosphorus: 29.5 µg/L. Surface area: 32 acres.
Is Hillsborough-Keene Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Hillsborough-Keene Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
Explore Hillsborough-Keene Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Eutrophic Lakes in Florida
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)
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