Clay-Johnson Lake
Clay County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Clay-Johnson Lake. Here is what has been measured.
- Mesotrophic
- 44 ft max depth
Clay-Johnson Lake in Clay County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 6 ft visibility. Phosphorus: 12 µg/L.
Clay-Johnson Lake is a mesotrophic lake in Clay County, Florida with an estimated average depth of about 44 feet. Overall water quality is improving over recent sampling years. Compared to the 16 other monitored lakes in Clay County, Clay-Johnson Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-04-09. Methodology: how these readings are compared.
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 Clay-Johnson 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 Clay-Johnson Lake
These are the measurements Florida DEP publishes for Clay-Johnson Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 6 ft. Phosphorus 12 µg/L. TSI 46.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 12µg/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. | 46 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Clay-Johnson Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~44 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 Clay-Johnson Lake.
Lake Size & Watershed
Watershed (drainage) area
6 sq mi
HydroLAKES / HydroSHEDS
Surface area
67 acres
HydroLAKES / HydroSHEDS
Shoreline
1.6 mi
HydroLAKES / HydroSHEDS
Elevation
92 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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Fishing Clay-Johnson Lake
Water Quality Trend: Improving
Based on 5 years of monitoring (2020–2024).
Water clarity
Improving5 years
Phosphorus
Improving-4.7 µg/L/yr5 years
Nearby Lakes in Clay County
Frequently asked questions about Clay-Johnson Lake
Where is Clay-Johnson Lake?
- Clay-Johnson Lake is a lake in Clay County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Clay-Johnson Lake?
- Clay-Johnson Lake in Clay County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 6 ft visibility. Phosphorus: 12 µg/L.
Is Clay-Johnson Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Clay-Johnson Lake?
- No published bathymetric survey covers Clay-Johnson Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 44 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Clay-Johnson Lake across LakeQuality
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Where this data comes from
255 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_WQX255 samples · 2020–2025
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.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)