Hillsborough-Long Pond
Hillsborough-Long Pond in Hillsborough County, Florida has a water quality grade of C (Fair). Water clarity: 2 ft visibility. Phosphorus: 50.5 µg/L.
- Clarity
- 2 ft
- Typical in August
- 88°F
- Max depth
- ~54 ft est.
- Type
- Eutrophic
- Trend
- → Stable
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Hillsborough-Long Pond is a productive, nutrient-rich eutrophic lake in Hillsborough County, Florida with an estimated average depth of about 54 feet. Water quality is graded C based on 1 sampling years through 2025. Water clarity is improving over recent sampling years. Compared to the 123 other monitored lakes in Hillsborough County, Hillsborough-Long Pond ranks #81 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-02-15. Grade methodology: LakeQuality methodology.
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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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Very murky, less than 2 ft of visibility. Phosphorus level: 50.5 µg/L. Trophic State Index: 64.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2 ft | Not graded |
| Phosphorus | 50.5 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 64 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Hillsborough-Long Pond
Compare lakeside cabins, hotels, and vacation rentals near Hillsborough-Long Pond 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.
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Water Temperature
Hillsborough-Long Pond typically sits around 88°F at the surface in August. Summer average is about 87°F. Usually warmest in Aug (about 88°F) and coldest in Feb (about 65°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 32 field readings (2010–2019) via the EPA Water Quality Portal. See the full Hillsborough-Long Pond water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~54 ft est. |
| Average Depth | ~9 ft est. |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Florida has not published bathymetry for Hillsborough-Long Pond.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Hillsborough-Long Pond
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.607 m/yr | 3 |
| Phosphorus | ↓ Declining | +8.69 µg/L/yr | 6 |
EPA Impairment Status
Hillsborough-Long Pond 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 FL1547B · Official waterbody report · Matched by proximity (0.07 km)
County Ranking
Ranked #81 of 124 lakes in Hillsborough County
Nearby Lakes in Hillsborough County
Frequently asked questions about Hillsborough-Long Pond
Where is Hillsborough-Long Pond?
- Hillsborough-Long Pond is a lake in Hillsborough County, Florida. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Hillsborough-Long Pond?
- Hillsborough-Long Pond in Hillsborough County, Florida has a water quality grade of C (Fair). Water clarity: 2 ft visibility. Phosphorus: 50.5 µg/L.
Is Hillsborough-Long Pond safe to swim in?
- Generally safe for swimming, moderate water quality. Hillsborough-Long Pond has a water quality grade of C (Fair). Always check local health department advisories before swimming.
What is the water temperature of Hillsborough-Long Pond?
- Hillsborough-Long Pond typically sits around 88°F at the surface in August, from 32 EPA Water Quality Portal field readings (2010–2019). That is a typical value for the month, not a live reading.
How deep is Hillsborough-Long Pond?
- No published bathymetric survey covers Hillsborough-Long Pond, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 54 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Hillsborough-Long Pond across LakeQuality
2.4 mi away · cable-pulled, no boat wake
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High nutrients, frequent algae, reduced clarity
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Where this data comes from
194 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_WQX194 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
Lake size & watershed from HydroLAKES (HydroSHEDS)