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Lake Level Information

Lake Erie and Ontario Water Levels:

  • Weekly Lake Erie and Lake Ontario Level and Flow Statements – These statements are also available by calling toll free at 1-800-833-6390. This service is provided in support of the International Lake Ontario - St. Lawrence River Board by the Buffalo District Corps of Engineers. The statements are updated each week.

Weekly Lake Erie Update

As of May 122021 the mean water level on Lake Erie was 573.13 feet (174.69 m). The long term average for the month of May is 571.94 feet (174.33 m).

The water level relative to chart datum for the following locations was: 

Toledo 4.0 feet (1.21 m)
Cleveland 3.9 feet (1.18 m)
Erie 3.9 feet (1.19 m)
Buffalo 3.9 feet (1.19 m)

The Lake Erie mean outflow was 255,700 ft3/s (7240 m3/s).

The Lake Erie levels and outflows may be obtained by calling the Buffalo District Public Affairs Office at (716) 879-4349.

Weekly Lake Ontario Update

As of May 12, 2021 the mean water level on Lake Ontario was 245.21 feet (74.74 m). The long term average for the month of May is 246.16 feet (75.03 m).

The water level relative to chart datum for the following locations was: 

Ogdensburg 1.6 feet (0.48 m)
Cornwall 1.6 feet (0.50 m)
Summerstown 1.4 feet (0.43 m)
Pointe Claire 3.1 feet (0.95 m)
Port of Montreal 2.2 feet (0.66 m)

The Lake Ontario mean outflow was 285,000 ft3/s (8070 m3/s).

More information is available on the International Lake Ontario - St. Lawrence River Board's internet site http://ijc.org/en/loslrb, or you can also contact the office of the secretary of the United States Section of the Board at (513) 684-2010.

Note: All water levels are reported with reference to International Great Lakes Datum 1985.