Water Level Forecasts Bulletin

St. Lawrence Ship Channel

Forecasts as of November 16, 2017, for the expected lowest water levels at the indicated stations in the St. Lawrence ship channel.

Expected lowest water level above chart datum
Sector 3 days
(17/11 - 19/11)
4 to 7 days
(20/11 - 22/11)
7 to 10 days
(23/11 - 26/11)
11 to 14 days
(27/11 - 30/11)
Week 3
(01/12 - 07/12)
Week 4
(08/12 - 14/12)
Montreal 1.15 m 1.20 m 1.1 m 1.0 m 1.0 m 0.9 m
Sorel 1.20 m 1.15 m 1.0 m 0.9 m 1.0 m 0.9 m
Lake Saint Pierre 1.20 m 1.15 m 1.0 m 0.9 m 0.9 m 0.8 m
Trois-Rivieres 1.25 m 1.20 m 1.0 m 0.9 m 1.0 m 0.9 m

Notes:

  1. These forecasts give the expected minimum water levels above chart datum at the indicated locations and at the specified times to assist commercial shipping in short term planning of operations (1 to 4 weeks).
  2. This bulletin is produced by the Hydraulic Engineering sector, CCG, Headquaters on Monday and Thursday of each week.
  3. The Canadian Coast Guard provides no guaranties on water levels and assumes no responsibilities relative to damages or losses resulting from the use of this information.
  4. It should be clearly understood that this information is a forecast of water levels which may be altered by short term hydrometeorological factors. The vessel master or officer-in-charge has the ultimate responsibility for the vessel safety at all times.
  5. The maritime industry has the responsibility of adding a sufficient safety margin to these forecasts. Hydrodynamic phenomena can influence water levels observed at gauging stations used by MCTS, especially during low water periods.

Comment :

  1. Light increase of water levels on the short term due to forecasted precipitations for the end of the week followed by a gradual decrease of water levels on the long term.
  2. Uncertainties on expected lowest water levels can be provided on demand.

Pertinent current information

1. Lake Ontario

Pertinent current information at Lake Ontario
Weekly average water level Outflow at the Moses-Saunders dam
Level (m) Difference from
previous week
Outflow (m3/s) Difference from
previous week
Last week 74.89 0.05 8490 130 (2%)
Current 74.88 -0.01 8530 40 (0%)

2. Ottawa river outflow

L'information importante en matière du débit de la Rivière des Outaouais
Total outflow at the Carillon dam Outfow into Lake St. Louis
Outflow (m3/s) Difference from
previous week
Outflow (m3/s) Difference from
previous week
Last week 4060 2200 (118%) 1770 1150 (185%)
Current 3000 -1060 (-26%) 1230 -540 (-31%)
Montreal expected lowest water level above chart datum chart image Sorel expected lowest water level above chart datum chart image Lake Saint Pierre expected lowest water level above chart datum chart image Trois-Rivieres expected lowest water level above chart datum chart image

Additional information may be obtained from:

Samir Gharbi, Ph.D., ing.
Waterways acting Manager
Canadian Coast Guard Programs
Central and Arctic Region
101 Champlain Boulevard
Québec (Quebec), G1K 7Y7
Phone: 418-648-7493
Cell: 418-454-5230
Fax: 418-648-6690
Samir.Gharbi@dfo-mpo.gc.ca