Cleve Branch Lake
Calvert County, MarylandView mapDirections
MDE publishes the water-quality measurements for Cleve Branch Lake. Here is what has been measured.
- Impaired · Mercury
- Limited data
Cleve Branch Lake in Calvert County, Maryland has water-quality measurements published by MDE, shown here as reported. Water clarity: 3 ft visibility.
Cleve Branch Lake is a lake in Calvert County, Maryland. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-10-20. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Cleve Branch Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Cleve Branch Lake is safe to swim in today is a call for the Maryland Department of the Environment and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Cleve Branch Lake
These are the measurements MDE publishes for Cleve Branch 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 3 ft of visibility. TSI 62.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| 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. | 62 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Cleve Branch Lake
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Fishing Cleve Branch Lake
Water quality readings over time
2 seasons of samples on record (2021–2022). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Worsening2 years
EPA Impairment Status
Cleve Branch Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 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 MD-021311010873-Lake_Lariat · Official waterbody report
Nearby Lakes in Calvert County
Frequently asked questions about Cleve Branch Lake
Where is Cleve Branch Lake?
- Cleve Branch Lake is a lake in Calvert County, Maryland. Its water-quality measurements are published by MDE and shown on this page as reported.
What is the water quality of Cleve Branch Lake?
- Cleve Branch Lake in Calvert County, Maryland has water-quality measurements published by MDE, shown here as reported. Water clarity: 3 ft visibility.
Is Cleve Branch Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Cleve Branch Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
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Where this data comes from
31 measurements from 1 monitoring station, 2021–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples31 samples · 2021–2022
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