Highlands-Sirena Lake
Highlands County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Highlands-Sirena Lake. Here is what has been measured.
- Oligotrophic
Highlands-Sirena Lake in Highlands County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 16 ft visibility. Phosphorus: 8 µg/L.
Highlands-Sirena Lake is a cold, clear oligotrophic lake in Highlands County, Florida. 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. Methodology: how these readings are compared.
What Highlands-Sirena Lake is good for
From access and monitoring records, not editorial picks.
- Clear water16 ft of visibility
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Highlands-Sirena Lake is safe to swim in today is a call for the Florida Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Highlands-Sirena Lake
These are the measurements Florida DEP publishes for Highlands-Sirena Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 16 ft down. Phosphorus 8 µg/L. TSI 36.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 16ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 8µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 36 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Highlands-Sirena Lake
Answers come straight from the public measurements and survey records on this page.
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.
Column height runs from this lake’s coldest month (63°F) to its warmest (88°F).
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 →
Stays via Stay22
Stays near Highlands-Sirena Lake
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Top-rated places to stay near Highlands-Sirena Lake
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Fishing Highlands-Sirena Lake
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2024).
Water clarity
Worsening5 years
Phosphorus
Stable+0.05 µg/L/yr5 years
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. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Highlands-Sirena Lake?
- Highlands-Sirena Lake in Highlands County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 16 ft visibility. Phosphorus: 8 µg/L.
Is Highlands-Sirena Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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
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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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.