Blanch Lake
Lake County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Blanch Lake. Here is what has been measured.
- 35 ft max depth
- Limited data
Blanch Lake in Lake County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Phosphorus: 40.4 µg/L.
Blanch Lake is a lake in Lake County, Florida with an estimated average depth of about 35 feet.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-04-29. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Blanch 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 Blanch Lake
These are the measurements Florida DEP publishes for Blanch Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 40.4 µg/L. TSI 57.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 40.4µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| 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. | 57 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Blanch Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Blanch Lake typically sits around 81°F at the surface in October. Summer average is about 84°F. Usually warmest in Jul (about 88°F) and coldest in Feb (about 59°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (59°F) to its warmest (88°F).
Typical surface water temperature by month, from 30 field readings (2010–2025) via the EPA Water Quality Portal. See the full Blanch Lake water temperature breakdown →
Lake Details
Max depth
~35 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 Blanch Lake.
Lake Size & Watershed
Watershed (drainage) area
2 sq mi
HydroLAKES / HydroSHEDS
Surface area
106 acres
HydroLAKES / HydroSHEDS
Shoreline
1.6 mi
HydroLAKES / HydroSHEDS
Elevation
56 ft
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.
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Stays near Blanch Lake
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Fishing Blanch Lake
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Frequently asked questions about Blanch Lake
Where is Blanch Lake?
- Blanch Lake is a lake in Lake County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Blanch Lake?
- Blanch Lake in Lake County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Phosphorus: 40.4 µg/L.
Is Blanch 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 Blanch Lake?
- Blanch Lake typically sits around 81°F at the surface in October, from 30 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
How deep is Blanch Lake?
- No published bathymetric survey covers Blanch Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 35 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
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Where this data comes from
7 measurements from 1 monitoring station, 2023–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples7 samples · 2023–2025
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
Lake size & watershed from HydroLAKES (HydroSHEDS)