Rosslake
Putnam County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Rosslake. Here is what has been measured.
- Hypereutrophic
- Impaired · Metals (other than mercury)
- Limited data
Rosslake in Putnam County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 1.3 ft visibility. Phosphorus: 100 µg/L.
Rosslake is a highly nutrient-loaded hypereutrophic lake in Putnam County, Florida. Water clarity is declining over recent sampling years. Compared to the 27 other monitored lakes in Putnam County, Rosslake ranks #24 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2020-09-29. Methodology: how these readings are compared.
Swimming conditions
Readings onlyRecreation use not supported
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. Rosslake is listed impaired under Clean Water Act §303(d) (IR 5) for metals (other than mercury), nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Rosslake 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 Rosslake
These are the measurements Florida DEP publishes for Rosslake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1.3 ft of visibility. Phosphorus 100 µg/L. TSI 72.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 100µg/L | Poor 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. | 72 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Rosslake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Rosslake typically sits around 78°F at the surface in October. Summer average is about 81°F. Usually warmest in Jul (about 82°F) and coldest in Mar (about 65°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (65°F) to its warmest (82°F).
Typical surface water temperature by month, from 19 field readings (2018–2020) via the EPA Water Quality Portal. See the full Rosslake water temperature breakdown →
Stays via Stay22
Stays near Rosslake
Compare lakeside cabins, hotels, and vacation rentals near Rosslake in Putnam 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. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Rosslake are listed below.
Top-rated places to stay near Rosslake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
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Planning a whole trip? See where to stay at Florida’s top lakes →
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Fishing Rosslake
Water Quality Trend: Stable
Based on 5 years of monitoring (2020–2024).
Water clarity
Worsening5 years
Phosphorus
Improving-1.1 µg/L/yr5 years
EPA Impairment Status
Rosslake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Recreation.
Source: EPA ATTAINS assessment unit FL2543F · Official waterbody report
Nearby Lakes in Putnam County
Frequently asked questions about Rosslake
Where is Rosslake?
- Rosslake is a lake in Putnam County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Rosslake?
- Rosslake in Putnam County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 1.3 ft visibility. Phosphorus: 100 µg/L.
Is Rosslake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Rosslake is listed impaired under Clean Water Act §303(d) (IR 5) for metals (other than mercury), nutrients (phosphorus, nitrogen). Check local advisories before you swim.
What is the water temperature of Rosslake?
- Rosslake typically sits around 78°F at the surface in October, from 19 EPA Water Quality Portal field readings (2018–2020). That is a typical value for the month, not a live reading.
Explore Rosslake across LakeQuality
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Where this data comes from
8 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FL Dept. of Environmental Protection, Northeast District
21FLA_WQX8 samples · 2020
Monitoring station identifiers (1)
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database