Highlands-Sirena Lake
Highlands-Sirena Lake in Highlands County, Florida has a water quality grade of B (Good). Water clarity: 16 ft visibility. Phosphorus: 8 µg/L.
- Clarity
- 16 ft
- Typical in June
- 88°F
- Type
- Oligotrophic
- Trend
- ↓ Declining
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Highlands-Sirena Lake is a cold, clear oligotrophic lake in Highlands 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 72 other monitored lakes in Highlands County, Highlands-Sirena Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-12-21. Grade methodology: LakeQuality methodology.
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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)
Crystal clear, you can see 16 ft down. Phosphorus level: 8 µg/L. Trophic State Index: 36.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 16 ft | Not graded |
| Phosphorus | 8 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 36 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Highlands-Sirena Lake
Compare lakeside cabins, hotels, and vacation rentals near Highlands-Sirena Lake in Highlands 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 Highlands-Sirena Lake
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Water Temperature
Highlands-Sirena Lake typically sits around 88°F at the surface in June. Summer average is about 88°F. Usually warmest in Jun (about 88°F) and coldest in Feb (about 63°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 13 field readings (2010–2016) via the EPA Water Quality Portal. See the full Highlands-Sirena Lake water temperature breakdown →
Fishing Highlands-Sirena Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.565 m/yr | 5 |
| Phosphorus | → Stable | +0.05 µg/L/yr | 5 |
EPA Impairment Status
Highlands-Sirena 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 FL1938I · Official waterbody report · Matched by proximity (2.12 km)
County Ranking
Ranked #1 of 73 lakes in Highlands County
Nearby Lakes in Highlands County
Frequently asked questions about Highlands-Sirena Lake
Where is Highlands-Sirena Lake?
- Highlands-Sirena Lake is a lake in Highlands County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Highlands-Sirena Lake?
- Highlands-Sirena Lake in Highlands County, Florida has a water quality grade of B (Good). Water clarity: 16 ft visibility. Phosphorus: 8 µg/L.
Is Highlands-Sirena Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Highlands-Sirena Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Highlands-Sirena Lake?
- Highlands-Sirena Lake typically sits around 88°F at the surface in June, from 13 EPA Water Quality Portal field readings (2010–2016). That is a typical value for the month, not a live reading.
Explore Highlands-Sirena Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Oligotrophic Lakes in Florida
Where this data comes from
55 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_WQX55 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