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

Cortland County Lake Quality

New York, 11 lakes, measured by NY DEC

Cortland County has 11 monitored lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. The 11 monitored lakes in Cortland 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 Cortland County

Top-rated places to stay near Cortland County

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Quick Answers for Cortland County

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

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

All Lakes in Cortland County

11 lakes · 0 ranked on readings, 11 without enough sampling0 lakes ranked on readings · 11 without enough sampling, hidden

#LakeClarityPhosphorusAlgaeTrophicMax DepthAccess
Upper Little York LakeCortland11 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Ellis LakeCortland7.8 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Song LakeCortland15.4 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Tully LakeCortland11.9 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Solon PondCortlandNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Goodale LakeCortlandNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Beaver PondCortlandNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Stump PondCortlandNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Bloody PondCortlandNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
High LakeCortlandNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Dean PondCortlandNo recent samplesNo recent samplesNo recent samplesNo recent samples16.4 ftNot 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.