St. Lawrence Ship Channel

Forecasts as of : January 11, 2024

Water levels should remain relatively stable in the short term. A decrease in water levels is expected in the longer term, largely due to the management of upstream control structures, which will favour the formation of stable ice covers. Levels will rise again when ice conditions permit.

Forecasted water levels [m above CD]

Stations	3 days (12/01 - 14/01)	4 to 6 days (15/01 - 17/01)	7 to 10 days (18/01 - 21/01)	11 to 14 days (22/01 - 25/01)	Week 3 (26/01 - 01/02)	Week 4 (02/02 - 08/02)
Montreal #15520	▼ 1.17 ■ 0.90 ▲ 0.85	1.39 0.95 0.89	1.41 0.70 0.64	1.44 0.54 0.53	1.67 0.53 0.53	1.76 0.71 0.73
Sorel #15930	▼ 1.30 ■ 1.11 ▲ 1.07	1.50 1.17 1.12	1.52 0.98 0.91	1.53 0.82 0.81	1.67 0.82 0.82	1.73 0.88 0.88
Lake Saint Pierre #15975	▼ 1.41 ■ 1.12 ▲ 1.08	1.50 1.17 1.10	1.47 0.95 0.89	1.47 0.79 0.76	1.59 0.79 0.77	1.61 0.77 0.76
Trois-Rivieres #03360	▼ 1.52 ■ 1.14 ▲ 1.08	1.52 1.18 1.11	1.47 0.92 0.86	1.38 0.72 0.70	1.50 0.73 0.71	1.45 0.60 0.58

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.

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

Lake Ontario Outflows [m³/s]

	Current year	Historical meanb (1900-2020)
Last week	7400	6500
Current week	7420	6340

Ottawa River at Carillon Dam Outflows [m³/s]

	Current year	Historical meanb (1900-2020)
Last week	2480	1860
Current week	2320	1943

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