Lake Ontario outflows increased, water level begins slow decline

To increase the rate of decline in Lake Ontario levels, the International Lake Ontario-St. Lawrence River Board increased the flow June 14 to 10,400 m3/s (367,300 cfs). This is the highest outflow ever continuously released from Lake Ontario, surpassing the flows released in previous high-water years.

In 1973, a maximum outflow of 9,910 m3/s (350,000 cfs) was continuously released from June 2 through August 3; and in 1998, a continuous outflow of about 10,190 m3/s (359,900 cfs) was released for 13 days in March, prior to the Seaway season opening.

The current flow rate of 10,400 m3/s (367,300 cfs) is also higher than what was achieved with the off-and-on flow pattern that occurred from May 20 to June 11, 1993.

The board continues to monitor the system and will convene again today, June 19, to assess the impact from the change in outflow. Information can be found on the board’s Facebook page. For more detailed information, click here.

Maritime Editorial