Home > Missions > Great Lakes Information > Great Lakes Water Levels > Water Level Forecast > Weekly Great Lakes Water Levels

Weekly Great Lakes Water Levels

We do not have the ability to offer email updates at this time.  The Weekly Forecast of Great Lakes Water Levels is updated each week on Thursday afternoon.

Click here for a printer friendly version.

Weekly Forecast

WEEKLY GREAT LAKES WATER LEVEL UPDATE

September 19, 2014

 

WEATHER CONDITIONS

Fall like weather arrived in the Great Lakes basin this week.  Other than some light precipitation to start the work week, conditions were largely dry across the region.  Look for scattered showers at times this weekend accompanied by warmer temperatures.  To date in September, the Great Lakes basin as a whole has received above average precipitation.

LAKE LEVEL CONDITIONS

Lakes Superior and Michigan-Huron are 9 and 19 inches, respectively, above their levels of a year ago. Lakes St. Clair and Erie are 14 and 7 inches, respectively, above what they were at this time last year, while Lake Ontario is 1 inch above its level from a year ago.  Lakes Superior and Michigan-Huron are predicted to fall 1 and 2 inches, respectively over the next month.  Lakes St. Clair, Erie, and Ontario are projected to fall 6, 5, and 6 inches, respectively, over the next 30 days.  See our Daily Levels web page for more water level information.

FORECASTED MONTHLY OUTFLOWS/CHANNEL CONDITIONS

Lake Superior’s outflow through the St. Mary’s River is forecasted to be well above average for the month of September.  Lake Michigan-Huron’s outflow into the St. Clair River and Lake St. Clair’s outflow into the Detroit River are predicted to be near average in September.  In addition, the outflow of Lake Erie into the Niagara River and Lake Ontario’s outflow into the St. Lawrence River are projected to be above average in September.

ALERTS

Official records are based on monthly average water levels and not daily water levels.  Users of the Great Lakes, connecting channels and St. Lawrence River should keep informed of current conditions before undertaking any activities that could be affected by changing water levels.  Mariners should utilize navigation charts and refer to current water level readings.

SUPERIOR

MICH-HURON

ST. CLAIR

ERIE

ONTARIO

Forecasted Water Level for Sep 19, 2014 (feet)

602.69

579.07

575.03

571.88

245.28

Chart Datum (feet)

601.10

577.50

572.30

569.20

243.30

Difference from chart datum (inches)

+19

+19

+33

+32

+24

Difference from average water level for Aug 19, 2014 (inches*)

+1

+1

+1

-2

-7

Difference from average water level for Sep 19, 2013 (inches*)

+9

+19

+14

+7

+1

Difference from long-term monthly average of Sep (inches)

+7

0

+7

+6

+1

Difference from highest monthly average of record for Sep (inches)

-6

-35

-22

-20

-26

Year of highest recorded monthly mean

1985

1986

1986

1986

1947

Difference from lowest monthly average of record for Sep (inches)

+27

+29

+37

+37

+33

Year of lowest recorded monthly mean

2007

1964

1934

1934

1934

Projected change in levels by Oct 19, 2014 (inches)

-1

-2

-6

-5

-6

ALL DATA SHOWN IN THIS SUMMARY ARE REFERENCED TO IGLD 1985

*VALUES FOR SPECIFIC DAY ARE BASED ON 3-DAY DAILY AVERAGE AROUND SPECIFIED DATE

LONG TERM AVERAGE PERIOD OF RECORD, 1918-2013

FORECASTED INFORMATION PROVIDED BY

RECORDED DATA (1918 – present)

FOR MORE INFORMATION VISIT

Department of the Army

provided by

Detroit District Great Lakes Homepage

Detroit District, Corps of Engineers

NOAA, Great Lakes Online

International Joint Commission

Detroit District Home

(301) 713-9596

Great Lakes Information Network

1-888-694-8318 ext. 1

 

 

 

Detroit District Disclaimer

NOTICE:  All data contained herein is preliminary in nature and therefore subject to change. The data is for general information purposes ONLY and SHALL NOT be used in technical applications such as, but not limited to, studies or designs. All critical data should be obtained from and verified by the United States Army Corps of Engineers, Detroit District, Engineering and Technical Services, Great Lakes Hydraulics and Hydrology Office, 477 Michigan Ave., Detroit, MI 48226. The United States of America assumes no liability for the completeness or accuracy of the data contained herein and any use of such data inconsistent with this disclaimer shall be solely at the risk of the user.