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) |
| 2019-10-19 | 0001 | 8,920 | 315,000 | 8,870 | 313,200 |
| 2019-10-13 | 1601 | 8,600 | 303,700 | 8,920 | 315,000 |
| 2019-10-13 | 1501 | 7,900 | 279,000 | 8,600 | 303,700 |
| 2019-10-11 | 1601 | 8,970 | 316,800 | 7,900 | 279,000 |
| 2019-10-05 | 0001 | 9,090 | 321,000 | 8,970 | 316,800 |
| 2019-09-28 | 0001 | 9,270 | 327,400 | 9,090 | 321,000 |
| 2019-09-21 | 0001 | 9,530 | 336,500 | 9,270 | 327,400 |
| 2019-09-14 | 0001 | 9,870 | 345,400 | 9,530 | 336,500 |
| 2019-09-07 | 0001 | 10,000 | 353,100 | 9,780 | 345,400 |
| 2019-08-31 | 0001 | 10,110 | 357,000 | 10,000 | 353,100 |
| 2019-08-21 | 0001 | 10,400 | 367,300 | 10,110 | 357,000 |
| 2019-06-13 | 0001 | 10,350 | 365,500 | 10,400 | 367,300 |
| 2019-06-12 | 0001 | 10,300 | 363,700 | 10,350 | 365,500 |
| 2019-06-11 | 0001 | 10,250 | 362,000 | 10,300 | 363,700 |
| 2019-06-10 | 0001 | 10,200 | 360,200 | 10,250 | 362,000 |
| 2019-06-06 | 1001 | 10,000 | 353,100 | 10,200 | 360,200 |
| 2019-06-05 | 2101 | 9,800 | 346,100 | 10,000 | 353,100 |
| 2019-06-04 | 0901 | 9,500 | 335,500 | 9,800 | 346,100 |
| 2019-06-03 | 1801 | 9,400 | 332,000 | 9,500 | 335,500 |
| 2019-06-03 | 1101 | 9,100 | 321,400 | 9,400 | 332,000 |
| 2019-06-02 | 1701 | 9,000 | 317,800 | 9,100 | 321,400 |
| 2019-06-01 | 1201 | 8,800 | 310,800 | 9,000 | 317,800 |
| 2019-05-31 | 0901 | 8,600 | 303,700 | 8,800 | 310,800 |
| 2019-05-27 | 0001 | 8,500 | 300,200 | 8,600 | 303,700 |
| 2019-05-23 | 1401 | 8,400 | 296,600 | 8,500 | 300,200 |
| 2019-05-22 | 1601 | 8,200 | 289,600 | 8,400 | 296,600 |
| 2019-05-22 | 0901 | 8,100 | 286,000 | 8,200 | 289,600 |
| 2019-05-21 | 1501 | 8,000 | 282,500 | 8,100 | 286,000 |
| 2019-05-21 | 0601 | 7,800 | 275,500 | 8,000 | 282,500 |
| 2019-05-19 | 0001 | 7,600 | 268,400 | 7,800 | 275,500 |
| 2019-05-17 | 1401 | 7,400 | 261,300 | 7,600 | 268,400 |
| 2019-05-16 | 2001 | 7,100 | 250,700 | 7,400 | 261,300 |
| 2019-05-14 | 1801 | 7,300 | 257,800 | 7,100 | 250,700 |
| 2019-05-11 | 0901 | 7,000 | 247,200 | 7,300 | 257,800 |
| 2019-05-10 | 0901 | 7,400 | 261,300 | 7,000 | 247,200 |
| 2019-05-10 | 0001 | 7,600 | 268,400 | 7,400 | 261,300 |
| 2019-05-08 | 1401 | 7,400 | 261,300 | 7,600 | 268,400 |
| 2019-05-08 | 0001 | 7,200 | 254,300 | 7,400 | 261,300 |
| 2019-05-07 | 0001 | 7,000 | 247,200 | 7,200 | 254,300 |
| 2019-05-06 | 0001 | 6,800 | 240,100 | 7,000 | 247,200 |
| 2019-05-04 | 1601 | 6,500 | 229,500 | 6,800 | 240,100 |
| 2019-05-04 | 0001 | 6,300 | 222,500 | 6,500 | 229,500 |
| 2019-05-02 | 1501 | 6,100 | 215,400 | 6,300 | 222,500 |
| 2019-04-29 | 1301 | 5,900 | 208,400 | 6,100 | 215,400 |
| 2019-04-28 | 1601 | 5,500 | 194,200 | 5,900 | 208,400 |
| 2019-04-26 | 1601 | 5,700 | 201,300 | 5,500 | 194,200 |
| 2019-04-25 | 1201 | 6,000 | 211,900 | 5,700 | 201,300 |
| 2019-04-24 | 1601 | 5,800 | 204,800 | 6,000 | 211,900 |
| 2019-04-24 | 0001 | 5,600 | 197,800 | 5,800 | 204,800 |
| 2019-04-22 | 1001 | 5,900 | 208,400 | 5,600 | 197,800 |
| 2019-04-20 | 2001 | 6,400 | 226,000 | 5,900 | 208,400 |
| 2019-04-20 | 1201 | 7,000 | 247,200 | 6,400 | 226,000 |
| 2019-04-20 | 0001 | 7,400 | 261,300 | 7,000 | 247,200 |
| 2019-04-18 | 2001 | 7,600 | 268,400 | 7,400 | 261,300 |
| 2019-04-15 | 1401 | 8,000 | 282,500 | 7,600 | 268,400 |
| 2019-04-15 | 0001 | 8,400 | 296,600 | 8,000 | 282,500 |
| 2019-04-14 | 1201 | 8,710 | 307,600 | 8,400 | 296,600 |
| 2019-04-13 | 0001 | 8,680 | 306,500 | 8,710 | 307,600 |
| 2019-04-06 | 0001 | 8,620 | 304,400 | 8,680 | 306,500 |
| 2019-03-26 | 0001 | 8,820 | 311,500 | 8,620 | 304,400 |
| 2019-03-23 | 0001 | 8,680 | 306,500 | 8,820 | 311,500 |
| 2019-03-16 | 0001 | 8,670 | 306,200 | 8,680 | 306,500 |
| 2019-03-09 | 0001 | 8,700 | 307,200 | 8,670 | 306,200 |
| 2019-02-27 | 1901 | 8,600 | 303,700 | 8,700 | 307,200 |
| 2019-02-26 | 1601 | 8,500 | 300,200 | 8,600 | 303,700 |
| 2019-02-21 | 1401 | 8,400 | 296,600 | 8,500 | 300,200 |
| 2019-02-17 | 1201 | 8,300 | 293,100 | 8,400 | 296,600 |
| 2019-02-16 | 1201 | 8,100 | 286,000 | 8,300 | 293,100 |
| 2019-02-14 | 1201 | 7,800 | 275,500 | 8,100 | 286,000 |
| 2019-02-12 | 1601 | 8,100 | 286,000 | 7,800 | 275,500 |
| 2019-02-11 | 1601 | 8,300 | 293,100 | 8,100 | 286,000 |
| 2019-02-10 | 1201 | 8,000 | 282,500 | 8,300 | 293,100 |
| 2019-02-09 | 1201 | 7,730 | 273,000 | 8,000 | 282,500 |
| 2019-02-07 | 1501 | 7,600 | 268,400 | 7,730 | 273,000 |
| 2019-02-03 | 1101 | 7,860 | 277,600 | 7,600 | 268,400 |
| 2019-02-02 | 0001 | 7,470 | 263,800 | 7,860 | 277,600 |
| 2019-01-30 | 0001 | 7,200 | 254,300 | 7,470 | 263,800 |
| 2019-01-28 | 1301 | 6,900 | 243,700 | 7,200 | 254,300 |
| 2019-01-27 | 1301 | 6,700 | 236,600 | 6,900 | 243,700 |
| 2019-01-23 | 1601 | 6,400 | 226,000 | 6,700 | 236,600 |
| 2019-01-20 | 1901 | 6,230 | 220,000 | 6,400 | 226,000 |
| 2019-01-16 | 1701 | 6,500 | 229,500 | 6,230 | 220,000 |
| 2019-01-14 | 1601 | 6,300 | 222,500 | 6,500 | 229,500 |
| 2019-01-13 | 1601 | 6,700 | 236,600 | 6,300 | 222,500 |
| 2019-01-12 | 1601 | 7,100 | 250,700 | 6,700 | 236,600 |
| 2019-01-11 | 1701 | 8,540 | 301,600 | 7,100 | 250,700 |
| 2019-01-05 | 0001 | 8,380 | 295,900 | 8,540 | 301,600 |
To view outflow change records from previous years, please use the links below: