Putnam-Fanny Lake
Putnam-Fanny Lake in Putnam County, Florida has a water quality grade of B (Good). Water clarity: 11.5 ft visibility. Phosphorus: 8 µg/L.
- Clarity
- 11.5 ft
- Typical in July
- 82°F
- Max depth
- ~51 ft est.
- Type
- Oligotrophic
- Trend
- ↓ Declining
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Putnam-Fanny Lake is a cold, clear oligotrophic lake in Putnam County, Florida with an estimated average depth of about 51 feet. Water quality is graded B based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. Compared to the 27 other monitored lakes in Putnam County, Putnam-Fanny Lake ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-03-22. 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)
Good clarity, visible to about 11.5 ft. Phosphorus level: 8 µg/L. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.5 ft | Not graded |
| Phosphorus | 8 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Putnam-Fanny Lake
Compare lakeside cabins, hotels, and vacation rentals near Putnam-Fanny Lake 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.
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Water Temperature
Putnam-Fanny Lake typically sits around 82°F at the surface in July. Summer average is about 82°F. Usually warmest in Oct (about 83°F) and coldest in Jan (about 55°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 12 field readings (2018–2019) via the EPA Water Quality Portal. See the full Putnam-Fanny Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~51 ft est. |
| Average Depth | ~11 ft est. |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Florida has not published bathymetry for Putnam-Fanny Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Putnam-Fanny Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.04 m/yr | 5 |
| Phosphorus | ↓ Declining | +0.5 µg/L/yr | 5 |
EPA Impairment Status
Putnam-Fanny Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4C).
Causes of impairment
Source: EPA ATTAINS assessment unit FL2732X · Official waterbody report · Matched by proximity (0.04 km)
County Ranking
Ranked #9 of 28 lakes in Putnam County
Nearby Lakes in Putnam County
Frequently asked questions about Putnam-Fanny Lake
Where is Putnam-Fanny Lake?
- Putnam-Fanny Lake is a lake in Putnam County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Putnam-Fanny Lake?
- Putnam-Fanny Lake in Putnam County, Florida has a water quality grade of B (Good). Water clarity: 11.5 ft visibility. Phosphorus: 8 µg/L.
Is Putnam-Fanny Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Putnam-Fanny Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Putnam-Fanny Lake?
- Putnam-Fanny Lake typically sits around 82°F at the surface in July, from 12 EPA Water Quality Portal field readings (2018–2019). That is a typical value for the month, not a live reading.
How deep is Putnam-Fanny Lake?
- No published bathymetric survey covers Putnam-Fanny Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 51 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Putnam-Fanny Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Oligotrophic Lakes in Florida
Where this data comes from
331 measurements from 3 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX331 samples · 2020–2025
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
Lake size & watershed from HydroLAKES (HydroSHEDS)