Black Lake
St. Lawrence County, New York7,856 acresView mapDirections
No nutrient or algae sampling on record from NY DEC for this lake.
- Impaired · Nutrients (phosphorus, nitrogen)
- 16 ft max depth
Black Lake in St. Lawrence County, New York has water-quality measurements published by NY DEC, shown here as reported. Maximum depth: 16.1 ft. Surface area: 7856 acres.
Black Lake is a 7,856-acre lake in St. Lawrence County, New York with a maximum depth of 16 feet (8-foot average).
Source: EPA Water Quality Portal sampling records, NYSDEC. Methodology: how these readings are compared.
What Black Lake is good for
From access and monitoring records, not editorial picks.
- Big water7,856 acres
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Black Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Black Lake is safe to swim in today is a call for the New York Department of Environmental Conservation and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Black Lake
These are the measurements NY DEC publishes for Black Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. TSI undefined.
Ask about Black Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
16.1 ft
Average depth
8.2 ft
Surface area
7,856 acres
Shoreline
59.1 mi
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Stays near Black Lake
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Fishing Black Lake
EPA Impairment Status
Black 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: Recreation.
Source: EPA ATTAINS assessment unit NY0906-0001 · Official waterbody report
Nearby Lakes in St. Lawrence County
Frequently asked questions about Black Lake
Where is Black Lake?
- Black Lake is a lake in St. Lawrence County, New York. Its water-quality measurements are published by NY DEC and shown on this page as reported.
What is the water quality of Black Lake?
- Black Lake in St. Lawrence County, New York has water-quality measurements published by NY DEC, shown here as reported. Maximum depth: 16.1 ft. Surface area: 7856 acres.
Is Black Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Black Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Black Lake?
- Black Lake has a maximum depth of 16.1 feet and an average depth of 8.2 feet. The lake covers 7856 acres.
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Where this data comes from
Measurements for Black Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database