With the current lake level still being over a half meter higher than normal-translates to flood stage. This past Wednesday the IJC decided to reduce the outflow from the Mosses Saunders dam. The amount of the reduction may seem small but 1 cm over the course of a week is still badly needed. We need to get the lake level down faster not slower as the summer/fall storm season approaches, which in past years has sent enormous waves crashing onto the shores. See below for the latest IJC news release
Friday August 23rd, the average level is at 75.51 M (247.736 Feet)
Per Fisheries and Oceans Canada, Since 2009, the August lake level average has been 74.98 M
The average lake level for August 2017 was 75.43 M
Surface water temperature by the lift bridge is 18 C / 65 F
Next reading date is: Friday September 6th, 2019
Reading date / Lake Average 2019
Aug 16 – 75.585
Aug 09 – 75.65
Aug 02 – 75.72
July 26 – 75.78
July 19 - 75.85
July 11 - 75.89
July 05 - 75.93
June 28 - 75.95
June 21 - 75.95
June 14 – 75.984
June 07 – 75.97
May 30 - 75.94
May 24 - 75.86
May 17 - 75.795
May 03 - 75.51
Apr 29 - 75.41
Apr 12 - 75.10
Mar 29 - 75.018
Mar 15 - 75.0
Mar 08 - 74.97
Feb 22 - 75.00
Feb 08 - 74.96
Jan 25 - 74.88
Jan 11 - 74.81
++++++++++++++++++++++++++++++++++++++++++++++
Reading date / Lake Average 2018
Dec 28 – 74.78
Dec 14 – 74.72
Nov 30 – 74.696
Nov 16 – 74.68
Nov 02 – 74.67
Oct 19 – 74.614
Oct 05 – 74.72
Sept 21 – 74.785
Sept 07 – 74.86
Aug 24 – 74.91
Aug 10 – 74.98
Jul 30 – 75.12
Jul 13 – 75.129
Jun 29 – 75.228
Jun 15 – 75.25
Jun 01 – 75.33
May 18 – 75.35
May 04 – 75.23
Apr 20 – 75.08
Apr 06 – 74.97
Mar 23 – 74.918
Mar 09 – 74.99
Feb 23 – 74.973
Feb 09 – 74.90
Jan 26 – 74.95
Jan 12 – 74.81 M
++++++++++++++++++++++++++++++++++++++++++++++++
Reading date / Lake Average 2017
Dec 27 – 74.71 M
Dec 08 – 74.795
Nov 24 – 74.89
Nov 09 – 74.929
Oct 27 – 74.83
Oct 10 – 74.95
Sept 29 – 74.99
Sept 15 – 75.12
Sept 01 – 75.28
Aug 18 - 75.47
Aug 04 - 75.6
July 22 - 75.71
And courtesy of the IJC,, their numbers
International Lake Ontario - St. Lawrence River Board
Conseil international du lac Ontario et du fleuve Saint-Laurent
The Lake Ontario outflow was reduced to 10,110 m3/s at 12:01 AM on August 21, 2019. This flow rate is 200 m3/s above the normal safe navigation flow limit that applies at the current Lake Ontario elevation as defined by the regulation plan. This flow remains a record-high value for this time of the year. The average Lake Ontario outflow is expected to remain at 10,110 m3/s for the coming week. Actual outflows will depend on conditions in the St. Lawrence River.
Week Ending: Average this time
Wed, 21 Aug 2019 of the year (c)
Lake Ontario / Lac Ontario
Actual end of week level: 75.48 (247.64) 74.86 (245.60)
Computed Plan 2014 Level (a): 75.56 (247.90)
Computed Preproject Level (b): 76.05 (249.51)
Weekly Mean Outflow: 10360 (365900) 7690 (271600)
Weekly Total Supply: 8440 (298100) 6430 (227100)
Lake St. Lawrence at Long Sault Dam 72.84 (238.98) 73.33 (240.58)
Weekly Mean Level:
Lake St. Louis at Pointe-Claire Weekly 21.80 (71.52) 21.20 (69.55)
Mean Level:
Montreal Harbour at Jetty #1 Weekly Mean 6.86 (22.51) 6.29 (20.64)
Level:
Ottawa River at Carillon Weekly Mean 830 (29300) 1130 (39900)
Outflow:
Preliminary Lake Ontario Outflow for Week 10110 (357000) 7630 (269400)
Ending Fri, 30 Aug 2019:
Levels are in metres (feet) IGLD 1985. Supply and flows are in cubic metres (feet) per second m³/s (ft³/s).
(a) Levels that would have occurred with strict adherence to Plan 2014.
(b) Levels that would have occurred had there been no Lake Ontario regulation.
(c) For comparison purposes, Lake Ontario water level data since 1918 are used to be consistent with those published in the US and Canadian Great Lakes bulletins (
http://www.waterlevels.gc.ca/C&A/bulletin-eng.html). Other averages are for the periods as follows: Lake Ontario outflows and levels at Long Sault and Pointe-Claire since 1960; Montreal since 1967; and Ottawa River outflow at Carillon since 1963.
The regulation plan for Lake Ontario specifies a weekly average outflow from Saturday through the following Friday, inclusive. To provide timely information for the coming week to the hydropower and Seaway operators, and our readers, we complete the regulation plan calculations each Thursday. Our calculations use the data available at the time, which are from the previous seven days (Thursday through Wednesday). Since the two time periods do not exactly coincide, their data are usually slightly different.
The table shows the actual flow for the week ending Wednesday. It also gives the preliminary flow for the coming week ending Friday. We emphasize that this is the preliminary flow, since unforeseen flow changes may occur after we have issued our notice. When these flow changes occur, they are reflected in the subsequent week's notice.
Le tableau indique le débit réel hebdomadaire se terminant le mercredi. On trouve aussi le débit préliminaire de la semaine suivante se terminant le vendredi. Nous insistons sur le fait que ce débit est préliminaire, étant donné que des changements imprévisibles peuvent avoir lieu après l'envoi du message. Lorsque de tels changements surviennent, ils sont incorporés dans l'évaluation de la semaine suivante.
Information in this report is compiled from provisional data provided by: Environment & Climate Change Canada, Fisheries and Oceans Canada, Hydro Quebec, Ontario Power Generation Inc, the New York Power Authority, and the U.S. National Ocean and Atmospheric Administration.
Visit the Board's website at
https://ijc.org/en/loslrb to find out more.