St. Lawrence Ship Channel

Forecasts as of May 22, 2018, 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 (23/05 - 25/05)	4 to 7 days (26/05 - 28/05)	7 to 10 days (29/05 - 01/06)	11 to 14 days (02/06 - 05/06)	Week 3 (06/06 - 12/06)	Week 4 (13/06 - 19/06)
Montreal	1.75 m	1.75 m	1.7 m	1.6 m	1.4 m	1.4 m
Sorel	1.60 m	1.60 m	1.5 m	1.4 m	1.2 m	1.2 m
Lake Saint Pierre	1.65 m	1.60 m	1.6 m	1.4 m	1.2 m	1.2 m
Trois-Rivieres	1.65 m	1.60 m	1.5 m	1.4 m	1.2 m	1.2 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. Gradual decrease of water levels for the following weeks.
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	75.25	0.08	7540	-360 (-5%)
Current	75.28	0.03	8270	730 (10%)

2. Ottawa river outflow

Pertinent current information at Ottawa river outflow

	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	5660	1420 (33%)	2690	860 (47%)
Current	5610	-50 (-1%)	2670	-20 (-1%)

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Additional information may be obtained from:

Frédéric Filion, Eng.
Waterways manager
Canadian Coast Guard Programs
Central Region
101 Champlain Boulevard
Québec (Quebec), G1K 7Y7
Phone: 418-648-7493
Cell: 418-446-1056
Frederic.Filion@dfo-mpo.gc.ca