Long Lake
Hamilton County, New York4,168 acresView mapDirections
No nutrient or algae sampling on record from NY DEC for this lake.
- Impaired · Mercury
- 45 ft max depth
Long Lake in Hamilton County, New York has water-quality measurements published by NY DEC, shown here as reported. Maximum depth: 44.9 ft. Surface area: 4168 acres.
Long Lake is a 4,168-acre lake in Hamilton County, New York with a maximum depth of 45 feet (11-foot average).
Source: EPA Water Quality Portal sampling records, NYSDEC. Methodology: how these readings are compared.
What Long Lake is good for
From access and monitoring records, not editorial picks.
- Deep water44.9 ft surveyed max depth
- Big water4,168 acres
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Long Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Long 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 Long Lake
These are the measurements NY DEC publishes for Long 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 Long Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
44.9 ft
Average depth
10.8 ft
Surface area
4,168 acres
Shoreline
44.3 mi
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Stays near Long Lake
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Fishing Long Lake
EPA Impairment Status
Long 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.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NY0903-0078 · Official waterbody report
Nearby Lakes in Hamilton County
Frequently asked questions about Long Lake
Where is Long Lake?
- Long Lake is a lake in Hamilton 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 Long Lake?
- Long Lake in Hamilton County, New York has water-quality measurements published by NY DEC, shown here as reported. Maximum depth: 44.9 ft. Surface area: 4168 acres.
Is Long Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Long Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Long Lake?
- Long Lake has a maximum depth of 44.9 feet and an average depth of 10.8 feet. The lake covers 4168 acres.
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Where this data comes from
Measurements for Long 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