Hillsborough-Dead Lady Lake
Hillsborough-Dead Lady Lake in Hillsborough County, Florida has a water quality grade of B (Good). Water clarity: 5 ft visibility. Phosphorus: 40 µg/L.
- Clarity
- 5 ft
- Typical in August
- 83°F
- Type
- Eutrophic
- Trend
- ↑ Improving
Next lake in Hillsborough County
Swipe left or right on this bar to open the next or previous lake.
Hillsborough-Dead Lady Lake is a 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-Dead Lady Lake ranks #37 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-03-28. Grade methodology: LakeQuality methodology.
Watch Hillsborough-Dead Lady Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Grade onlyLow algae
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)
Murky, only visible to about 5 ft. Phosphorus level: 40 µg/L. Trophic State Index: 56.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5 ft | Not graded |
| Phosphorus | 40 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 56 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Hillsborough-Dead Lady Lake
Compare lakeside cabins, hotels, and vacation rentals near Hillsborough-Dead Lady 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-Dead Lady Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Florida’s top lakes →
Water Temperature
Hillsborough-Dead Lady Lake typically sits around 83°F at the surface in August. Summer average is about 83°F. Usually warmest in Aug (about 83°F) and coldest in Mar (about 64°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 35 field readings (2011–2017) via the EPA Water Quality Portal. See the full Hillsborough-Dead Lady Lake water temperature breakdown →
Fishing Hillsborough-Dead Lady Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.655 m/yr | 5 |
| Phosphorus | → Stable | -0.2 µg/L/yr | 5 |
EPA Impairment Status
Hillsborough-Dead Lady 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 FL1474W · Official waterbody report · Matched by proximity (0.01 km)
County Ranking
Ranked #37 of 124 lakes in Hillsborough County
Nearby Lakes in Hillsborough County
Frequently asked questions about Hillsborough-Dead Lady Lake
Where is Hillsborough-Dead Lady Lake?
- Hillsborough-Dead Lady 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-Dead Lady Lake?
- Hillsborough-Dead Lady Lake in Hillsborough County, Florida has a water quality grade of B (Good). Water clarity: 5 ft visibility. Phosphorus: 40 µg/L.
Is Hillsborough-Dead Lady Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Hillsborough-Dead Lady Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Hillsborough-Dead Lady Lake?
- Hillsborough-Dead Lady Lake typically sits around 83°F at the surface in August, from 35 EPA Water Quality Portal field readings (2011–2017). That is a typical value for the month, not a live reading.
Explore Hillsborough-Dead Lady Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
160 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_WQX160 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