Cld Lake
Flagler County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Cld Lake. Here is what has been measured.
- Eutrophic
- Impaired · Mercury
Cld Lake in Flagler County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 1.3 ft visibility. Phosphorus: 35.7 µg/L.
Cld Lake is a productive, nutrient-rich eutrophic lake in Flagler County, Florida. Overall water quality is improving over recent sampling years. Compared to the 8 other monitored lakes in Flagler County, Cld Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-02-20. 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. Cld Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), pH / acidity. Check local advisories before you swim.
Whether Cld 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 Cld Lake
These are the measurements Florida DEP publishes for Cld Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1.3 ft of visibility. Phosphorus 35.7 µg/L. TSI 64.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 35.7µg/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. | 64 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Cld Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Cld Lake typically sits around 77°F at the surface in October. Summer average is about 86°F. Usually warmest in Jul (about 87°F) and coldest in Jan (about 60°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (60°F) to its warmest (87°F).
Typical surface water temperature by month, from 63 field readings (2010–2025) via the EPA Water Quality Portal. See the full Cld Lake water temperature breakdown →
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Stays near Cld Lake
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Fishing Cld Lake
Water Quality Trend: Improving
Based on 5 years of monitoring (2020–2024).
Water clarity
Improving5 years
Phosphorus
Stable-0.15 µg/L/yr5 years
EPA Impairment Status
Cld Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL2630B · Official waterbody report
Nearby Lakes in Flagler County
Frequently asked questions about Cld Lake
Where is Cld Lake?
- Cld Lake is a lake in Flagler County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Cld Lake?
- Cld Lake in Flagler County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 1.3 ft visibility. Phosphorus: 35.7 µg/L.
Is Cld Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Cld Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), pH / acidity. Check local advisories before you swim.
What is the water temperature of Cld Lake?
- Cld Lake typically sits around 77°F at the surface in October, from 63 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
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Where this data comes from
79 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- St. Johns River Water Management District
21FLSJWM_WQX79 samples · 2020–2025
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
Impairment status from EPA ATTAINS 303(d) database