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Marine Navigation Services - Water Level Information

St. Lawrence Ship Channel

Water Level Forecasts and Information Bulletin (No. 11-30)

This is the last forecast bulletin for 2011 navigation season.
The next bulletin will be published in May 2012.

Forecasts as of December 8, 2011, for the expected lowest water levels at the indicated stations in the St. Lawrence ship channel.

EXPECTED LOWEST WATER LEVEL ABOVE CHART DATUM

STATION	CHART DATUM (m)	WEEK 1 (9/12-15/12)	WEEK 2 (16/12-22/12>	WEEK 3 (23/12-29/12)	WEEK 4 (30/12-05/01)
MONTREAL	5.55	0.6m (2' 0")	N/A	N/A	N/A
SOREL	3.78	0.7m (2' 4")	N/A	N/A	N/A
TROIS-RIVIERES	2.90	0.9m (2' 11")	N/A	N/A	N/A

Note: These forecasts give the expected minimum water levels at the indicated locations and at the specified times to assist commercial shipping in short term planning of operations. Due to current conditions, levels should be closely monitored along with the weekly updates to water level forecasts.

This bulletin is produced and distributed on Thursday of each week during the navigation season.

Caution: It should be clearly understood that this information is a forecast of water levels which may be altered by short term hydro- meteorological factors. The vessel master or officer-in-charge has the ultimate responsibility for the vessel safety at all times.

Pertinent Current Information

1. Lake Ontario

	Lake Level (m)	Compare to LTA (m)	Outflow (cms)
Last Week	74.57	0.04	7570
Current	74.61	0.07	7740

2. Ottawa River Outflow :

	Total Outflow (cms)		Outflow into Lake St. Louis (cms)
	Outflow	Difference from Previous Week	Outflow	Difference from Previous Week
Last Week	1730	390 (29%)	630	190 (43%)
Current	2290	560 (32%)	920	290 (46%)

Additional information may be obtained from :

Waterways Management

Canadian Coast Guard
5th floor, 200 Kent Street
Ottawa, Ontario
K1A 0E6

Tel: (613)998-1381
Fax: (613)991-2473