Clay-Asbury South Lake
Clay-Asbury South Lake in Clay County, Florida has a water quality grade of B (Good). Water clarity: 6 ft visibility. Phosphorus: 19 µg/L. Surface area: 61 acres.
- Clarity
- 6 ft
- Area
- 61 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
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Clay-Asbury South Lake is a 61-acre mesotrophic lake in Clay County, Florida. Water quality is graded B based on 1 sampling years through 2023. 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. 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)
Murky, only visible to about 6 ft. Phosphorus level: 19 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6 ft | Not graded |
| Phosphorus | 19 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Clay-Asbury South Lake
Compare lakeside cabins, hotels, and vacation rentals near Clay-Asbury South Lake in Clay 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.
Top-rated places to stay near Clay-Asbury South Lake
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Planning a whole trip? See where to stay at Florida’s top lakes →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 61 acres |
No bathymetric survey has been published for Clay-Asbury South Lake, so its depth is not documented here.
Fishing Clay-Asbury South Lake
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +2.375 m/yr | 3 |
| Phosphorus | ↑ Improving | -1.75 µg/L/yr | 3 |
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)
EPA Impairment Status
Clay-Asbury South Lake 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 FL2424 · Official waterbody report · Matched by proximity (2.54 km)
County Ranking
Ranked #8 of 17 lakes in Clay County
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. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Clay-Asbury South Lake?
- Clay-Asbury South Lake in Clay County, Florida has a water quality grade of B (Good). Water clarity: 6 ft visibility. Phosphorus: 19 µg/L. Surface area: 61 acres.
Is Clay-Asbury South Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Clay-Asbury South Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
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 Florida Lake Rankings
Other Grade B 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)
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