Clw Lake
Marion County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Clw Lake. Here is what has been measured.
- Mesotrophic
- Impaired · Algal growth
Clw Lake in Marion County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 5.2 ft visibility. Phosphorus: 18.4 µg/L.
Clw Lake is a mesotrophic lake in Marion County, Florida. Water clarity is improving over recent sampling years. Compared to the 17 other monitored lakes in Marion County, Clw Lake ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-03-31. Methodology: how these readings are compared.
Swimming conditions
Readings onlyRecreation use not supported
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. Clw Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for algal growth, mercury, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Clw 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 Clw Lake
These are the measurements Florida DEP publishes for Clw 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 5.2 ft. Phosphorus 18.4 µg/L. TSI 50.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 5.2ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 18.4µg/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. | 50 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Clw Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Clw Lake typically sits around 80°F at the surface in October. Summer average is about 85°F. Usually warmest in Jul (about 86°F) and coldest in Jan (about 61°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (61°F) to its warmest (86°F).
Typical surface water temperature by month, from 118 field readings (2010–2025) via the EPA Water Quality Portal. See the full Clw Lake water temperature breakdown →
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Stays near Clw Lake
Compare lakeside cabins, hotels, and vacation rentals near Clw Lake in Marion 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.
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Fishing Clw Lake
Water Quality Trend: Stable
Based on 5 years of monitoring (2020–2024).
Water clarity
Improving5 years
Phosphorus
Worsening+0.69 µg/L/yr5 years
EPA Impairment Status
Clw Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL2790A · Official waterbody report
Nearby Lakes in Marion County
Frequently asked questions about Clw Lake
Where is Clw Lake?
- Clw Lake is a lake in Marion County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Clw Lake?
- Clw Lake in Marion County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 5.2 ft visibility. Phosphorus: 18.4 µg/L.
Is Clw Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Clw Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for algal growth, mercury, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
What is the water temperature of Clw Lake?
- Clw Lake typically sits around 80°F at the surface in October, from 118 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
Explore Clw Lake across LakeQuality
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Where this data comes from
97 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_WQX97 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