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 and operational requirements: 

The Board is no longer deviating by releasing outflows above Plan 2014 prescribed flows, since Lake Ontario reached its peak and began its seasonal decline. High inflows from the upper Great Lakes will continue for the foreseeable future and, in response, Plan 2014 will continue to prescribe very high outflows. Lake Ontario outflows are at the maximum rate while maintaining currents in the St. Lawrence River that allow for commercial navigation. For more information: https://ijc.org/en/loslrb/lake-ontario-water-levels-declining-board-adjusts-outflow-strategy.

 

DATE HOUR/ FROM/DE    TO/À   
(YYYY-MM-DD) HEURE (m3/s) (ft3/s) (m3/s) (ft3/s)
2020-07-04 0001 9,220 325,600 9,110 321,700
2020-06-27 0001 9,330 329,500 9,220 325,600
2020-06-20 0001 9,470 334,400 9,330 329,500
2020-06-13 0001 9,510 335,800 9,470 334,400
2020-06-10 1701 8,750 309,000 9,510 335,800
2020-06-08 1401 9,510 335,800 8,750 309,000
2020-06-06 0001 9,550 337,300 9,510 335,800
2020-05-30 0001 9,580 338,300 9,550 337,300
2020-05-23 0001 9,680 341,800 9,580 338,300
2020-05-20 1401 9,800 346,100 9,680 341,800
2020-05-16 0001 9,880 348,900 9,800 346,100
2020-05-08 1301 9,850 347,800 9,880 348,900
2020-05-05 1301 9,760 344,700 9,850 347,800
2020-05-03 1701 9,000 317,800 9,760 344,700
2020-05-01 0001 9,650 340,800 9,000 317,800
2020-04-28 1401 9,580 338,300 9,650 340,800
2020-04-24 1901 9,450 333,700 9,580 338,300
2020-04-22 1501 9,300 328,400 9,450 333,700
2020-04-21 1201 9,000 317,800 9,300 328,400
2020-04-19 1301 8,900 314,300 9,000 317,800
2020-04-18 1301 8,800 310,800 8,900 314,300
2020-04-17 1401 8,450 298,400 8,800 310,800
2020-04-16 1401 8,600 303,700 8,450 298,400
2020-04-16 1001 8,800 310,800 8,600 303,700
2020-04-15 1601 8,500 300,200 8,800 310,800
2020-04-15 1001 8,300 293,100 8,500 300,200
2020-04-14 2001 8,200 289,600 8,300 293,100
2020-04-14 1401 8,100 286,000 8,200 289,600
2020-04-13 1601 8,400 296,600 8,100 286,000
2020-04-13 0001 8,600 303,700 8,400 296,600
2020-04-11 1301 8,500 300,200 8,600 303,700
2020-04-10 1601 8,400 296,600 8,500 300,200
2020-04-09 1301 8,800 310,800 8,400 296,600
2020-04-08 1101 8,600 303,700 8,800 310,800
2020-04-05 1801 8,800 310,800 8,600 303,700
2020-04-02 1101 8,500 300,200 8,800 310,800
2020-03-31 1001 8,700 307,200 8,500 300,200
2020-03-30 1901 8,900 314,300 8,700 307,200
2020-03-30 1001 9,200 324,900 8,900 314,300
2020-03-29 2301 9,500 335,500 9,200 324,900
2020-03-29 1501 9,900 349,600 9,500 335,500
2020-03-28 1501 10,200 360,200 9,900 349,600
2020-03-26 0901 10,000 353,100 10,200 360,200
2020-03-25 1101 9,850 347,800 10,000 353,100
2020-03-24 1101 9,650 340,800 9,850 347,800
2020-03-23 2001 9,450 333,700 9,650 340,800
2020-03-22 1101 9,600 339,000 9,450 333,700
2020-03-20 1901 9,750 344,300 9,600 339,000
2020-03-18 1001 9,600 339,000 9,750 344,300
2020-03-16 1301 9,400 332,000 9,600 339,000
2020-03-14 1101 9,100 321,400 9,400 332,000
2020-03-13 1401 9,400 332,000 9,100 321,400
2020-03-11 1101 9,800 346,100 9,400 332,000
2020-03-10 2101 10,000 353,100 9,800 346,100
2020-03-10 1401 10,300 363,700 10,000 353,100
2020-03-08 1101 10,000 353,100 10,300 363,700
2020-03-07 1401 9,700 342,600 10,000 353,100
2020-03-06 1901 9,500 335,500 9,700 342,600
2020-03-06 1101 9,100 321,400 9,500 335,500
2020-03-05 1901 8,900 314,300 9,100 321,400
2020-03-05 1101 8,600 303,700 8,900 314,300
2020-03-04 1901 8,900 314,300 8,600 303,700
2020-03-02 2201 9,100 321,400 8,900 314,300
2020-03-02 1001 8,900 314,300 9,100 321,400
2020-03-01 1001 8,700 307,200 8,900 314,300
2020-02-29 2001 8,500 300,200 8,700 307,200
2020-02-28 2001 9,000 317,800 8,500 300,200
2020-02-28 1701 9,400 332,000 9,000 317,800
2020-02-28 1001 9,900 349,600 9,400 332,000
2020-02-26 1601 10,300 363,700 9,900 349,600
2020-02-24 1901 10,600 374,300 10,300 363,700
2020-02-23 1801 10,300 363,700 10,600 374,300
2020-02-22 1101 9,500 335,500 10,300 363,700
2020-02-21 1201 9,000 317,800 9,500 335,500
2020-02-20 1601 9,400 332,000 9,000 317,800
2020-02-19 1301 9,700 342,600 9,400 332,000
2020-02-18 0901 10,100 356,700 9,700 342,600
2020-02-16 1301 9,700 342,600 10,100 356,700
2020-02-15 1701 9,400 332,000 9,700 342,600
2020-02-15 1001 8,700 307,200 9,400 332,000
2020-02-14 1501 8,400 296,600 8,700 307,200
2020-02-13 1901 9,500 335,500 8,400 296,600
2020-02-12 1201 9,300 328,400 9,500 335,500
2020-02-11 1501 8,800 310,800 9,300 328,400
2020-02-10 1601 8,200 289,600 8,800 310,800
2020-02-09 1601 7,600 268,400 8,200 289,600
2020-02-09 1001 7,300 257,800 7,600 268,400
2020-02-08 1901 7,500 264,900 7,300 257,800
2020-02-08 1001 8,200 289,600 7,500 264,900
2020-02-07 1801 9,200 324,900 8,200 289,600
2020-02-07 1501 10,200 360,200 9,200 324,900
2020-02-02 1201 10,000 353,100 10,200 360,200
2020-02-01 1201 9,600 339,000 10,000 353,100
2020-01-31 1201 9,000 317,800 9,600 339,000
2020-01-29 1701 8,700 307,200 9,000 317,800
2020-01-23 1601 8,300 293,100 8,700 307,200
2020-01-22 1601 7,700 271,900 8,300 293,100
2020-01-21 1301 7,200 254,300 7,700 271,900
2020-01-20 1601 7,000 247,200 7,200 254,300
2020-01-19 1801 7,500 264,900 7,000 247,200
2020-01-18 1901 8,200 289,600 7,500 264,900
2020-01-17 1801 9,000 317,800 8,200 289,600
2020-01-17 1001 8,800 310,800 9,000 317,800
2020-01-16 1301 9,450 333,700 8,800 310,800
2020-01-15 1801 9,250 326,700 9,450 333,700
2020-01-15 0001 9,000 317,800 9,250 326,700
2020-01-14 1201 8,750 309,000 9,000 317,800
2020-01-12 1501 9,000 317,800 8,750 309,000
2020-01-12 1001 9,400 332,000 9,000 317,800
2020-01-12 0001 9,900 349,600 9,400 332,000
2020-01-11 1601 10,400 367,300 9,900 349,600
2020-01-10 1701 10,200 360,200 10,400 367,300
2020-01-10 0001 10,400 367,300 10,200 360,200
2020-01-09 1601 10,600 374,300 10,400 367,300
2020-01-07 1101 10,400 367,300 10,600 374,300
2020-01-05 1201 10,300 363,700 10,400 367,300
2020-01-04 1901 10,500 370,800 10,300 363,700
2020-01-03 1601 10,700 377,900 10,500 370,800
2020-01-02 1201 10,500 370,800 10,700 377,900
2020-01-01 2001 10,300 363,700 10,500 370,800
2020-01-01 1001 10,000 353,100 10,300 363,700
2019-12-31 0801 9,200 324,900 10,000 353,100

 

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

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