Hillsborough-Armistead Lake
Hillsborough-Armistead Lake in Hillsborough County, Florida has a water quality grade of B (Good). Water clarity: 5.7 ft visibility. Phosphorus: 21.5 µg/L. Surface area: 33.12 acres.
- Clarity
- 5.7 ft
- Typical in August
- 87°F
- Area
- 33 acres
- Type
- Eutrophic
- Trend
- ↓ Declining
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Hillsborough-Armistead Lake is a 33-acre productive, nutrient-rich eutrophic lake in Hillsborough County, Florida. Water quality is graded B based on 1 sampling years through 2024. Overall water quality is declining over recent sampling years. Compared to the 123 other monitored lakes in Hillsborough County, Hillsborough-Armistead Lake ranks #33 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-11-21. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLimited data
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 5.7 ft. Phosphorus level: 21.5 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.7 ft | Not graded |
| Phosphorus | 21.5 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 50 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Hillsborough-Armistead Lake
Compare lakeside cabins, hotels, and vacation rentals near Hillsborough-Armistead 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.
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Water Temperature
Hillsborough-Armistead Lake typically sits around 87°F at the surface in August. Summer average is about 86°F. Usually warmest in Aug (about 87°F) and coldest in Mar (about 69°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 63 field readings (2015–2019) via the EPA Water Quality Portal. See the full Hillsborough-Armistead Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 33 acres |
No bathymetric survey has been published for Hillsborough-Armistead Lake, so its depth is not documented here.
Fishing Hillsborough-Armistead Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.27 m/yr | 5 |
| Phosphorus | ↓ Declining | +4.15 µg/L/yr | 5 |
Reservoir Info (USACE NID)
Hillsborough-Armistead Lake is a man-made reservoir impounded by the Lake Armistead (completed 1972), built primarily for flood risk reduction on the Lake Armistead/ROCKY CREEK; other-type dam, 7 ft tall and 35.7 ft long.
- Surface area
- 33.12 ac
- Normal storage
- 4,785 ac-ft
- Max storage
- 6,000 ac-ft
- Drainage area
- 0 sq mi
- Hazard class
- Significant
- Owner
- SWFWMD
Source: USACE National Inventory of Dams, NID ID FL12009 · Operator website · Matched by proximity (0.18 km)
EPA Impairment Status
Hillsborough-Armistead 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 FL1519C · Official waterbody report · Matched by proximity (0.04 km)
County Ranking
Ranked #33 of 124 lakes in Hillsborough County
Nearby Lakes in Hillsborough County
Frequently asked questions about Hillsborough-Armistead Lake
Where is Hillsborough-Armistead Lake?
- Hillsborough-Armistead 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-Armistead Lake?
- Hillsborough-Armistead Lake in Hillsborough County, Florida has a water quality grade of B (Good). Water clarity: 5.7 ft visibility. Phosphorus: 21.5 µg/L. Surface area: 33.12 acres.
Is Hillsborough-Armistead Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Hillsborough-Armistead Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Hillsborough-Armistead Lake?
- Hillsborough-Armistead Lake typically sits around 87°F at the surface in August, from 63 EPA Water Quality Portal field readings (2015–2019). That is a typical value for the month, not a live reading.
Explore Hillsborough-Armistead Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
83 measurements from 3 monitoring stations, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX83 samples · 2020–2024
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