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LakeQuality
Late afternoon sun over Slim Lake, scattering a bright path across wind-textured water

Jefferson County Lake Quality

New York, 25 lakes, measured by NY DEC

The county-level average smooths over real differences — a single agricultural watershed near the southwest corner can pull the average down even if the rest of the county runs clean. The 25 monitored lakes in Jefferson County carry whatever clarity, phosphorus, and chlorophyll-a readings NY DEC has published, shown as reported.

Most of the county's monitored lakes are shallow, under 50 feet, which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed.

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Where to stay near Jefferson County

Top-rated places to stay near Jefferson County

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Quick Answers for Jefferson County

Cleanest lakes in Jefferson County →Cleanest lakes in New York →Best swimming lakes in New York →

Planning a trip? Check special fishing regulations for Butterfield Lake — or check the official New York fishing regulations.

All Lakes in Jefferson County

25 lakes · 0 ranked on readings, 25 without enough sampling0 lakes ranked on readings · 25 without enough sampling, hidden

#LakeClarityPhosphorusAlgaeTrophicMax DepthAccess
Butterfield LakeJefferson11.3 ftNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Millsite LakeJefferson27.9 ftNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Cranberry PondJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
South Colwell PondJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samples8 ft✓ Public
North Colwell PondJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Goose PondJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Floodwood PondJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Crystal LakeJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samples24 ftNot recorded
Henderson PondJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lakeview PondJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samples8 ft✓ Public
Lucky Star LakeJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Perch LakeJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake of the WoodsJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Red LakeJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samples41 ft✓ Public
Sixberry LakeJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Mud LakeJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Clear LakeJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samples44 ftNot recorded
Crystal LakeJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Hyde LakeJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samples24 ft✓ Public
Moon LakeJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samples20 ftNot recorded
Muskellunge LakeJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Payne LakeJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samples16.1 ft✓ Public
Dority PondJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Rutland LakeJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Pleasant LakeJeffersonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded

NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.

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Other Counties in New York

Seneca County

4 lakes

Hamilton County

198 lakes

Herkimer County

110 lakes

Essex County

129 lakes

Lewis County

33 lakes

Franklin County

134 lakes

Browse every New York lake, or the full directory of lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..

Source: the New York Department of Environmental Conservation. See data sources.