Lake Ontario Outflow Changes


Outflows from Lake Ontario are established on a weekly basis 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 feet per second.

DATE HOUR/ FROM/DE    TO/À   
YYYY-MM-DD HEURE (m3/s) (ft3/s) (m3/s) (ft3/s)
2018-12-06 1601 8,300 293,100 8,450 298,400
2018-12-04 1601 8,200 289,600 8,300 293,100
2018-12-03 1201 7,900 279,000 8,200 289,600
2018-12-02 1101 8,200 289,600 7,900 279,000
2018-11-29 1601 8,100 286,000 8,200 289,600
2018-11-28 1201 7,940 280,400 8,100 286,000
2018-11-27 1201 7,600 268,400 7,940 280,400
2018-11-26 1201 8,000 282,500 7,600 268,400
2018-11-21 1201 7,800 275,500 8,000 282,500
2018-11-19 1601 8,100 286,000 7,800 275,500
2018-11-16 1601 7,800 275,500 8,100 286,000
2018-11-15 1601 8,100 286,000 7,800 275,500
2018-11-10 1201 8,000 282,500 8,100 286,000
2018-11-06 1601 7,850 277,200 8,000 282,500
2018-11-03 1201 7,700 271,900 7,850 277,200
2018-11-03 0001 7,500 264,900 7,700 271,900
2018-11-02 1201 7,820 276,200 7,500 264,900
2018-10-29 1201 7,600 268,400 7,820 276,200
2018-10-28 1601 7,100 250,700 7,600 268,400
2018-10-27 1601 7,600 268,400 7,100 250,700
2018-10-26 1601 7,900 279,000 7,600 268,400
2018-10-24 1401 7,700 271,900 7,900 279,000
2018-10-23 1401 8,010 282,900 7,700 271,900
2018-10-14 1501 6,800 240,100 7,500 264,900
2018-10-14 1601 7,500 264,900 8,010 282,900
2018-10-12 1601 7,980 281,800 6,800 240,100
2018-10-07 1501 6,500 229,500 7,000 247,200
2018-10-07 1601 7,000 247,200 7,500 264,900
2018-10-07 1701 7,500 264,900 7,980 281,800
2018-10-05 0001 7,990 282,200 7,600 268,400
2018-10-05 1601 7,600 268,400 6,500 229,500
2018-10-03 1201 7,600 268,400 7,990 282,200
2018-10-01 1601 7,990 282,200 7,600 268,400
2018-09-29 0001 8,060 284,600 7,990 282,200
2018-09-25 1401 7,700 271,900 8,060 284,600
2018-09-24 1001 8,060 284,600 7,700 271,900
2018-09-22 0001 8,100 286,000 8,060 284,600
2018-09-14 0001 7,800 275,500 8,100 286,000
2018-09-12 1201 7,800 275,500 7,580 267,700
2018-09-12 1501 7,580 267,700 7,800 275,500
2018-09-09 1601 8,210 289,900 7,800 275,500
2018-09-08 0001 8,400 296,600 8,210 289,900
2018-08-25 0001 8,420 297,300 8,400 296,600
2018-08-18 0001 8,510 300,500 8,420 297,300
2018-08-11 0001 8,630 304,800 8,510 300,500
2018-08-04 0001 8,660 305,800 7,380 260,600
2018-08-04 0701 7,380 260,600 8,010 282,900
2018-08-04 0801 8,010 282,900 8,630 304,800
2018-07-28 0001 8,690 306,900 8,660 305,800
2018-07-21 0001 8,740 308,700 8,690 306,900
2018-07-14 0001 8,820 311,500 8,740 308,700
2018-07-07 0001 9,120 322,100 8,820 311,500
2018-06-30 0001 9,200 324,900 9,120 322,100
2018-06-24 0601 8,700 307,200 9,200 324,900
2018-06-17 1601 9,110 321,700 8,700 307,200
2018-06-16 0001 9,290 328,100 9,110 321,700
2018-06-09 0001 9,400 332,000 9,290 328,100
2018-06-04 0401 8,600 303,700 9,400 332,000
2018-06-03 0001 9,250 326,700 8,750 309,000
2018-06-03 0501 8,750 309,000 7,750 273,700
2018-06-03 2101 7,750 273,700 8,600 303,700
2018-06-02 0001 9,360 330,500 9,250 326,700
2018-05-26 0001 9,400 332,000 9,360 330,500
2018-05-23 1601 9,330 329,500 9,400 332,000
2018-05-21 1601 9,100 321,400 9,330 329,500
2018-05-19 1601 8,900 314,300 9,100 321,400
2018-05-18 2001 8,700 307,200 8,900 314,300
2018-05-17 0001 8,350 294,900 8,500 300,200
2018-05-17 1401 8,500 300,200 8,700 307,200
2018-05-15 1201 8,200 289,600 8,500 300,200
2018-05-15 2001 8,500 300,200 8,350 294,900
2018-05-14 1201 8,000 282,500 8,200 289,600
2018-05-13 1201 7,800 275,500 8,000 282,500
2018-05-12 0001 7,600 268,400 7,800 275,500
2018-05-09 1401 7,400 261,300 7,600 268,400
2018-05-07 1201 7,600 268,400 7,400 261,300
2018-05-01 1201 7,900 279,000 7,600 268,400
2018-04-30 1801 8,200 289,600 7,900 279,000
2018-04-29 1601 8,400 296,600 8,200 289,600
2018-04-28 0001 8,700 307,200 8,750 309,000
2018-04-28 1601 8,750 309,000 8,400 296,600
2018-04-19 1601 8,670 306,200 8,700 307,200
2018-04-17 0001 8,000 282,500 8,590 303,400
2018-04-17 1601 8,590 303,400 8,670 306,200
2018-04-16 0001 8,590 303,400 8,000 282,500
2018-04-14 0001 8,580 303,000 8,590 303,400
2018-04-07 0001 8,520 300,900 8,580 303,000
2018-03-31 0001 8,550 301,900 8,520 300,900
2018-03-29 0001 8,950 316,100 8,550 301,900
2018-03-24 0001 9,130 322,400 8,950 316,100
2018-03-17 0001 9,160 323,500 9,130 322,400
2018-03-04 0001 9,000 317,800 9,160 323,500
2018-02-28 1201 8,900 314,300 9,000 317,800
2018-02-26 1401 8,750 309,000 8,900 314,300
2018-02-25 2001 8,600 303,700 8,750 309,000
2018-02-24 1201 8,100 286,000 8,600 303,700
2018-02-23 1301 8,400 296,600 8,100 286,000
2018-02-22 2001 8,600 303,700 8,400 296,600
2018-02-16 2001 8,700 307,200 8,600 303,700
2018-02-15 0001 8,500 300,200 8,700 307,200
2018-02-14 1201 8,300 293,100 8,500 300,200
2018-02-12 1001 8,810 311,100 8,600 303,700
2018-02-12 2001 8,600 303,700 8,300 293,100
2018-02-11 0001 8,700 307,200 8,810 311,100
2018-02-10 0001 8,600 303,700 8,700 307,200
2018-02-07 2001 8,850 312,500 8,600 303,700
2018-02-05 1201 8,600 303,700 8,850 312,500
2018-02-02 1201 8,200 289,600 8,600 303,700
2018-01-31 1001 7,600 268,400 8,000 282,500
2018-01-31 1801 8,000 282,500 8,200 289,600
2018-01-30 1001 8,600 303,700 8,000 282,500
2018-01-30 1801 8,000 282,500 7,600 268,400
2018-01-29 1401 8,200 289,600 8,600 303,700
2018-01-28 1201 7,550 266,600 8,200 289,600
2018-01-26 0001 8,130 287,100 8,360 295,200
2018-01-26 0901 8,360 295,200 7,800 275,500
2018-01-26 1901 7,800 275,500 7,550 266,600
2018-01-25 0001 7,890 278,600 8,130 287,100
2018-01-22 0001 7,650 270,200 7,890 278,600
2018-01-21 0001 7,420 262,000 7,650 270,200
2018-01-20 0001 7,190 253,900 7,420 262,000
2018-01-13 0001 7,100 250,700 7,190 253,900
2018-01-12 0001 6,830 241,200 7,100 250,700
2018-01-10 0001 6,230 220,000 6,430 227,100
2018-01-10 1201 6,430 227,100 6,830 241,200


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

Flow Changes - 2017

Flow Changes - 2016

Flow Changes - 2015

Flow Changes - 2014

Flow Changes - 2013

Flow Changes - 2012

Flow Changes - 2011