This is the weekly bulletin of the International Lake Ontario - St. Lawrence River Board issued on August 11, 2017.  All water levels are reported with reference to the IGLD - 1985.
As of August 10, 2017:
The mean water level on Lake Ontario was 75.50 metres
The Long-term Average for the month of August is 74.88 metres
The water levels above Chart Datum for the following locations were:
  Brockville 1.15   metres
  Ogdensburg 1.12   metres
  Iroquois, above the dam 0.90 metres
  Iroquois, below the dam 0.82   metres
  Morrisburg 0.76 metres
  Cornwall 0.76   metres
  Summerstown 0.58 metres
  Ste. Anne-de Bellevue 0.51   metres
  Pointe Claire 1.43 metres
  Port of Montréal 1.33   metres
  Sorel 1.18   metres
  Trois-Rivières 1.30   metres
The Lake Ontario outflow was 9910 cubic metres per second