Clay-Asbury South Lake
Clay County, Florida61 acresView mapDirections
Florida DEP publishes the water-quality measurements for Clay-Asbury South Lake. Here is what has been measured.
- Mesotrophic
Clay-Asbury South Lake in Clay County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 6 ft visibility. Phosphorus: 19 µg/L. Surface area: 61 acres.
Clay-Asbury South Lake is a 61-acre mesotrophic lake in Clay County, Florida. Overall water quality is improving over recent sampling years. Compared to the 16 other monitored lakes in Clay County, Clay-Asbury South Lake ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2023-09-25. 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-Asbury South 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-Asbury South Lake
These are the measurements Florida DEP publishes for Clay-Asbury South 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 19 µg/L. TSI 49.
| 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 | 19µg/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. | 49 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Clay-Asbury South Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
61 acres
No bathymetric survey has been published for Clay-Asbury South Lake, so its depth is not documented here.
Stays via Stay22
Stays near Clay-Asbury South Lake
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Fishing Clay-Asbury South Lake
Water quality readings over time
3 seasons of samples on record (2022–2024). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Improving3 years
Phosphorus
Improving-1.75 µg/L/yr3 years
Reservoir Info (USACE NID)
Clay-Asbury South Lake is a man-made reservoir impounded by the Lake Asbury South Dam (completed 1967), built primarily for recreation on the Tr-Black Creek; earth-type dam, 31 ft tall and 1,040 ft long.
- Surface area
- 61 ac
- Normal storage
- 561 ac-ft
- Max storage
- 1,033 ac-ft
- Drainage area
- 1.69 sq mi
- Hazard class
- High
- Owner
- LAKE ASBURY MUNICIPAL SERVICES BENEFIT DISTRICT (LAMSBD)
All listed purposes: Recreation;Other.
Source: USACE National Inventory of Dams, NID ID FL00153 · Operator website · Matched by proximity (0.42 km)
Nearby Lakes in Clay County
Frequently asked questions about Clay-Asbury South Lake
Where is Clay-Asbury South Lake?
- Clay-Asbury South 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-Asbury South Lake?
- Clay-Asbury South Lake in Clay County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 6 ft visibility. Phosphorus: 19 µg/L. Surface area: 61 acres.
Is Clay-Asbury South Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Clay-Asbury South Lake across LakeQuality
Planning a trip around Castillo de San Marcos?
Clay-Asbury South Lake is about 32 miles from Castillo de San Marcos National Monument. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Castillo de San Marcos →More lakes in Florida
Other Lakes in Florida
Mesotrophic Lakes in Florida
Where this data comes from
111 measurements from 3 monitoring stations, 2021–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX111 samples · 2021–2023
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.