File
Lake Ontario Outflow Changes
The regulation plan (Plan 2014) specifies a weekly average Lake Ontario outflow from Saturday through the following Friday, inclusive. At times, the outflow is adjusted more frequently depending on conditions in the St. Lawrence River. For example, outflows were adjusted frequently in January and early February to promote and maintain stable ice conditions.
April 12-23, 2022 Update:
The outflow was reduced to allow Hydro-Québec to install safety booms near their facilities in the lower portion of the St. Lawrence River. Installation of these safety booms occurs every spring to improve safety for recreational users (e.g. swimmers and kayakers). Installation of the safety booms was successfully completed on April 23. This temporary period of reduced flows is considered a minor deviation from the regulation plan and will be offset as soon as conditions permit. For more information on the Board’s minor deviation authority, please read the Directive located here: https://ijc.org/en/loslrb/who/directives/deviations.
May 12, 2022 Update:
The outflow is expected to be maintained at 8,800 m3/s through May 22 to allow New York Power Authority to install a permanent safety barrier at Long Sault Dam. The plan-prescribed flow (L Limit) for May 14 through 20 is 8,930 m3/s. This temporary period of reduced flows is considered a minor deviation from the regulation plan and will be offset as soon as conditions permit. For more information on the Board’s minor deviation authority, please read the Directive located here: https://ijc.org/en/loslrb/who/directives/deviations.
| DATE | HOUR | OUTFLOW | OUTFLOW |
| (YYYY-MM-DD) | (HHMM) | (m3/s) | (cfs) |
| 2022-05-10 | 0501 | 8,800 | 310,800 |
| 2022-05-09 | 1201 | 9,040 | 319,200 |
| 2022-05-08 | 1201 | 8,950 | 316,100 |
| 2022-05-07 | 1101 | 8,800 | 310,800 |
| 2022-05-06 | 1201 | 8,650 | 305,500 |
| 2022-04-28 | 1201 | 8,550 | 301,900 |
| 2022-04-27 | 1201 | 8,450 | 298,400 |
| 2022-04-24 | 1101 | 8,300 | 293,100 |
| 2022-04-22 | 1701 | 8,100 | 286,000 |
| 2022-04-21 | 1601 | 7,900 | 279,000 |
| 2022-04-20 | 1101 | 7,600 | 268,400 |
| 2022-04-11 | 1201 | 8,100 | 286,000 |
| 2022-04-10 | 1201 | 7,900 | 279,000 |
| 2022-04-09 | 1201 | 7,550 | 266,600 |
| 2022-04-08 | 1501 | 7,700 | 271,900 |
| 2022-04-08 | 0901 | 7,900 | 279,000 |
| 2022-04-02 | 0001 | 8,730 | 308,300 |
| 2022-03-29 | 1101 | 8,690 | 306,900 |
| 2022-03-28 | 1101 | 8,600 | 303,700 |
| 2022-03-27 | 1101 | 8,300 | 293,100 |
| 2022-03-26 | 1801 | 8,100 | 286,000 |
| 2022-03-24 | 1401 | 8,000 | 282,500 |
| 2022-03-23 | 1101 | 8,620 | 304,400 |
| 2022-03-22 | 1101 | 8,300 | 293,100 |
| 2022-03-20 | 1401 | 8,000 | 282,500 |
| 2022-03-19 | 0001 | 8,700 | 307,200 |
| 2022-03-12 | 0001 | 8,660 | 305,800 |
| 2022-03-09 | 1201 | 8,600 | 303,700 |
| 2022-02-26 | 0001 | 8,520 | 300,900 |
| 2022-02-19 | 0001 | 8,180 | 288,900 |
| 2022-02-11 | 1201 | 8,210 | 289,900 |
| 2022-02-09 | 1201 | 8,100 | 286,000 |
| 2022-02-07 | 1201 | 7,900 | 279,000 |
| 2022-02-04 | 1201 | 7,700 | 271,900 |
| 2022-02-02 | 1201 | 7,500 | 264,900 |
| 2022-01-31 | 1201 | 7,300 | 257,800 |
| 2022-01-28 | 1201 | 7,100 | 250,700 |
| 2022-01-26 | 1201 | 6,900 | 243,700 |
| 2022-01-25 | 1101 | 6,700 | 236,600 |
| 2022-01-24 | 1101 | 6,500 | 229,500 |
| 2022-01-23 | 1501 | 6,200 | 219,000 |
| 2022-01-22 | 1601 | 6,450 | 227,800 |
| 2022-01-20 | 1601 | 6,200 | 219,000 |
| 2022-01-20 | 1501 | 6,600 | 233,100 |
| 2022-01-19 | 1501 | 7,000 | 247,200 |
| 2022-01-17 | 0401 | 6,600 | 233,100 |
| 2022-01-14 | 1801 | 7,200 | 254,300 |
| 2022-01-12 | 1801 | 7,950 | 280,800 |
| 2022-01-12 | 1301 | 7,600 | 268,400 |
| 2022-01-11 | 1701 | 7,400 | 261,300 |
| 2022-01-10 | 1501 | 8,100 | 286,000 |
| 2022-01-08 | 0001 | 8,310 | 293,500 |
| 2022-01-04 | 1201 | 8,410 | 297,000 |
| 2022-01-01 | 0001 | 8,530 | 301,200 |
To view outflow change records from previous years, please use the links below: