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Water Level Forecasts Bulletin

St. Lawrence Ship Channel

Water Level Forecasts Bulletin ( PDF Version, CSV, Others WFS and WMS formats )

Forecasts as of : November 17, 2022

Relatively stable water levels for the following weeks.

Forecasted water levels [m above CD]
Stations 3 days
(18/11 - 20/11)
4 to 6 days
(21/11 - 23/11)
7 to 10 days
(24/11 - 27/11)
11 to 14 days
(28/11 - 01/12)
Week 3
(02/12 - 08/12)
Week 4
(09/12 - 15/12)
Montreal
#15520
▼ 0.07
■ -0.05
▲ -0.12
0.21
0.01
-0.08
0.40
0.16
0.05
0.42
0.06
-0.05
0.71
0.04
-0.05
0.96
0.17
0.11
Sorel
#15930
▼ 0.33
■ 0.19
▲ 0.13
0.50
0.22
0.15
0.76
0.44
0.35
0.76
0.35
0.28
0.97
0.31
0.24
1.12
0.46
0.42
Lake Saint Pierre
#15975
▼ 0.38
■ 0.20
▲ 0.14
0.56
0.22
0.16
0.86
0.48
0.38
0.85
0.38
0.32
1.01
0.33
0.27
1.14
0.47
0.45
Trois-Rivieres
#03360
▼ 0.45
■ 0.28
▲ 0.21
0.60
0.30
0.22
0.94
0.55
0.46
0.92
0.43
0.37
1.07
0.36
0.32
1.17
0.45
0.44
  • Minimum water level forecast over the period for which there is a 15% probability of exceedance (PE 15 %).
  • Modeled minimum water level forecast over the period without uncertainties.
  • Minimum water level forecast over the period for which there is a 85% probability of exceedance (PE 85 %).
  • Recommended value for planning purposes.



Notes :
  1. The water levels associated with the probabilities of exceedance shown in the table are calculated from historical errors between forecasted and observed water levels. As a guide, there is a probability of about 15% that future water levels will be below the forecasted water levels for which there is a 85% probability of exceedance.
  2. The data in this bulletin, released Monday and Thursday of each week, is produced by the Hydraulic Engineering Sector of the Canadian Coast Guard, Headquarters, to help Commercial Mariners plan their activities for the next 4 weeks.
  3. The Canadian Coast Guard makes no warranty on the information contained in this bulletin and assumes no responsibility for any loss or damage incurred as a result of the use of this information.
  4. Hydro-meteorological factors can influence future water levels. The master of the vessel or the officer on duty is responsible for the safety of the vessel at all times.
  5. It is the responsibility of the maritime industry to maintain a sufficient safety margin in relation to these forecasts.
  6. The presence of ice could induce large variations in water levels. The water levels forecast in this bulletin do not take into account the potential variations resulting from the presence and possible management of this ice.
Observed and forecasted daily minimum water levelsa

Graphique du niveau d'eau minimal attendu par rapport au zéro des cartes pour Montreal

Graphique du niveau d'eau minimal attendu par rapport au zéro des cartes pour Sorel

Graphique du niveau d'eau minimal attendu par rapport au zéro des cartes pour Lake Saint Pierre

Graphique du niveau d'eau minimal attendu par rapport au zéro des cartes pour Trois-Rivieres

a. Water level modeled from available hydro-meteorological data (observed and forecast).

Relevant current information

Lake Ontario Outflows [m3/s]
   Current year Historical meanb (1900-2020)
Last week65006850
Current week63906840

Ottawa River at Carillon Dam Outflows [m3/s]
   Current year Historical meanb (1900-2020)
Last week14101868
Current week14701897

b. As published by International Lake Ontario - St. Lawrence River Board



For more information, contact the Waterways Division at:

MPO.GCC.NiveauxEauSL-CCG.WaterLevelSL.DFO@dfo-mpo.gc.ca

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