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)
2019-08-21	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:

Flow Changes - 2018