Lake Ontario Outflow Changes

Outflows from Lake Ontario are established by the International Lake Ontario - St. Lawrence River Board in accordance with the current regulation plan and the International Joint Commission's Orders of Approval. The table below displays the outflow changes that have occurred this year. All flows are reported in cubic metres and cubic feet per second.

Latest conditions:

As of 1 March 2021, Lake Ontario outflows are as prescribed by Plan 2014. The average Lake Ontario outflow is expected to be 8080 m³/s for the coming week, which is the amount specified by the regulation plan. For more information, see the Board's latest news release: https://ijc.org/en/loslrb/flood-risk-diminishes-very-high-outflows-continue

DATE HOUR/ FROM/DE    TO/À   
(YYYY-MM-DD) HEURE (m3/s) (ft3/s) (m3/s) (ft3/s)
2021-03-06 0001 8,140 287,500 8,080 285,300
2021-03-01 0001 8,600 303,700 8,140 287,500
2021-02-21 1501 8,400 296,600 8,600 303,700
2021-02-20 1201 8,000 282,500 8,400 296,600
2021-02-19 1201 7,600 268,400 8,000 282,500
2021-02-18 1801 7,400 261,300 7,600 268,400
2021-02-18 0701 7,000 247,200 7,400 261,300
2021-02-17 1101 6,600 233,100 7,000 247,200
2021-02-16 1401 7,000 247,200 6,600 233,100
2021-02-12 1401 7,400 261,300 7,000 247,200
2021-02-11 1601 8,300 293,100 7,400 261,300
2021-02-10 1901 8,500 300,200 8,300 293,100
2021-02-09 2001 8,800 310,800 8,500 300,200
2021-02-05 1801 8,200 289,600 8,800 310,800
2021-02-04 1201 7,700 271,900 8,200 289,600
2021-02-03 1401 7,100 250,700 7,700 271,900
2021-02-01 1501 6,900 243,700 7,100 250,700
2021-01-31 1801 7,200 254,300 6,900 243,700
2021-01-28 1601 7,700 271,900 7,200 254,300
2021-01-26 1001 7,200 254,300 7,700 271,900
2021-01-24 1701 8,400 296,600 7,200 254,300
2021-01-23 1701 9,200 324,900 8,400 296,600
2021-01-19 1501 9,400 332,000 9,200 324,900
2021-01-16 1701 9,200 324,900 9,400 332,000
2021-01-14 1201 9,500 335,500 9,200 324,900
2021-01-12 1201 9,400 332,000 9,500 335,500
2021-01-09 1501 9,300 328,400 9,400 332,000
2021-01-07 1301 9,200 324,900 9,300 328,400
2021-01-05 1001 9,400 332,000 9,200 324,900
2021-01-04 1701 9,500 335,500 9,400 332,000
2021-01-03 1301 9,400 332,000 9,500 335,500
2021-01-01 0801 8,090 285,700 9,400 332,000
2020-12-26 0001 8,110 286,400 8,090 285,700

 

To view outflow change records from previous years, please use the links below:

Flow Changes - 2020

Flow Changes - 2019

Flow Changes - 2018

Flow Changes - 2017

Flow Changes - 2016

Flow Changes - 2015

Flow Changes - 2014

Flow Changes - 2013

Flow Changes - 2012

Flow Changes - 2011