Rosslake
Rosslake in Putnam County, Florida has a water quality grade of D (Nutrient-rich). Water clarity: 1.3 ft visibility. Phosphorus: 100 µg/L.
- Clarity
- 1.3 ft
- Typical in August
- 81°F
- Type
- Hypereutrophic
- Trend
- → Stable
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Rosslake →
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Rosslake is a highly nutrient-loaded hypereutrophic lake in Putnam County, Florida. Water quality is graded D based on 1 sampling years through 2020. 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. 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.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 1.3 ft of visibility. Phosphorus level: 100 µg/L. Trophic State Index: 72.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.3 ft | Not graded |
| Phosphorus | 100 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 72 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay 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 grade measures nutrients and algae, not lodging — cabins and rentals around Rosslake are listed below.
Top-rated places to stay near Rosslake
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Planning a whole trip? See where to stay at Florida’s top lakes →
Water Temperature
Rosslake typically sits around 81°F at the surface in August. 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.
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 →
Fishing Rosslake
Water Quality Trend: → Stable
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.15 m/yr | 5 |
| Phosphorus | ↑ Improving | -1.1 µg/L/yr | 5 |
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
Source: EPA ATTAINS assessment unit FL2543F · Official waterbody report · Matched by proximity (0.16 km)
County Ranking
Ranked #24 of 28 lakes in Putnam County
Nearby Lakes With Higher Grades
Rosslake holds Grade D. 3 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Putnam County
Frequently asked questions about Rosslake
Where is Rosslake?
- Rosslake is a lake in Putnam County, Florida. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Rosslake?
- Rosslake in Putnam County, Florida has a water quality grade of D (Nutrient-rich). Water clarity: 1.3 ft visibility. Phosphorus: 100 µg/L.
Is Rosslake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Rosslake has a water quality grade of D (Nutrient-rich). Always check local health department advisories before swimming.
What is the water temperature of Rosslake?
- Rosslake typically sits around 81°F at the surface in August, 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
More Florida Lake Rankings
Other Grade D Lakes in Florida
Hypereutrophic Lakes in Florida
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)
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