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

St. Lawrence County Lake Quality

New York, 103 lakes, measured by NY DEC

St. Lawrence County in New York carries 103 monitored lakes — one of the lake-richer counties in our dataset. Coverage that dense usually reflects active lake-association sampling alongside state-agency monitoring. The 103 monitored lakes in St. Lawrence 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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Quick Answers for St. Lawrence County

Cleanest lakes in St. Lawrence County →Cleanest lakes in New York →Best swimming lakes in New York →

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

All Lakes in St. Lawrence County

103 lakes · 0 ranked on readings, 103 without enough sampling0 lakes ranked on readings · 103 without enough sampling, hidden

Include not-rated lakes (103)

Lake	Clarity	Phosphorus	Algae	Trophic	Max Depth	Access
Silver LakeSt. Lawrence	15.1 ft	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
Upper LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Lake OzoniaSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	52.5 ft	Not recorded
Weller PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	9.8 ft	Not recorded
Sterling PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Clear PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	23 ft	Not recorded
Five Falls ReservoirSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
South Colton ReservoirSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Rainbow Falls ReservoirSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	40 ft	Not recorded
Joe Indian PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Blake Falls ReservoirSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Barney PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Stark Falls ReservoirSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	50 ft	Not recorded
Kildare PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Jordan LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Amber LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Deer PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Windfall PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Catamount PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	6.6 ft	Not recorded
Massawepie LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	72.2 ft	Not recorded
Horseshoe PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	44 ft	Not recorded
Long PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Town Line PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	49.9 ft	Not recorded
Deer PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	44.9 ft	Not recorded
Jocks PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	18 ft	Not recorded
Sampson PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	4.9 ft	Not recorded
Grass River FlowSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	7.9 ft	Not recorded
Pleasant LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	12.1 ft	Not recorded
Clear PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	9.8 ft	Not recorded
Chandler PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Leonard PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Crooked LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Carry Falls ReservoirSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Long PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	8.9 ft	Not recorded
Pine MarshSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	4.9 ft	Not recorded
Tracy PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	18 ft	Not recorded
Tooley PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	9.8 ft	Not recorded
Cook PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	21 ft	Not recorded
Moosehead PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	27.9 ft	Not recorded
Greenfield PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	27.9 ft	Not recorded
Long PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	36.1 ft	Not recorded
Round PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	24 ft	Not recorded
Portaferry LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	80.1 ft	Not recorded
Boyd PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	43 ft	Not recorded
Clear LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	40 ft	Not recorded
Warm Brook FlowSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	27.9 ft	Not recorded
Arbuckle PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Green PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Lower LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Hickory LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Mud LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Black LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	16.1 ft	Not recorded
Pleasant LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	32 ft	Not recorded
Mud LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Yellow LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	5.2 ft	Not recorded
Grass LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	50.5 ft	Not recorded
Sylvia LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	129.9 ft	Not recorded
Mud PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Huckleberry LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Wolf LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Chub LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	30 ft	Not recorded
Trout LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	80.1 ft	Not recorded
Cedar LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	67.9 ft	Not recorded
Clear LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Bonner LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Twin PondsSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Pine Hill PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Jones PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	57.1 ft	Not recorded
Streeter LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	17.1 ft	Not recorded
Long LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	24.9 ft	Not recorded
Round LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	40 ft	Not recorded
Dry Timber LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	24.9 ft	Not recorded
Rock LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	19 ft	Not recorded
Long LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	Not recorded
Sucker LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Twin LakesSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Star LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	42.7 ft	Not recorded
Muskrat PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	14.1 ft	Not recorded
Lost PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	3.9 ft	Not recorded
Chaumont PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Heath PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Otter PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	15.1 ft	Not recorded
Spring PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	30.8 ft	Not recorded
Hornet PondsSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	19 ft	Not recorded
Otter PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	32.2 ft	Not recorded
Lake MarianSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	152.9 ft	Not recorded
Scott PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Bassout PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	29.9 ft	Not recorded
Olmstead PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	Not recorded
Cranberry LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	31.2 ft	Not recorded
Burntbridge PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	4.9 ft	Not recorded
Dog PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	46.9 ft	Not recorded
Panther PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	55.1 ft	Not recorded
Eagle Crag LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	49.9 ft	Not recorded
Mount Arab LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	54.1 ft	Not recorded
Bridge Brook PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	24.9 ft	Not recorded
Horseshoe LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	13.5 ft	Not recorded
Hitchins PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	33.1 ft	Not recorded
Lows LakeSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Long PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	23 ft	Not recorded
Little Trout PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	65.9 ft	Not recorded
Trout PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	83 ft	Not recorded
Raquette PondSt. Lawrence	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not 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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Source: the New York Department of Environmental Conservation. See data sources.