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Weekly Great Lakes Water Levels

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Weekly Forecast

WEEKLY GREAT LAKES WATER LEVEL UPDATE

January 30, 2015

 

WEATHER CONDITIONS

Northern parts of the Great Lakes Basin experienced warmer than average temperatures for most of the past week with several places 10 to 15 degrees above normal while the southern portion of the basin saw normal temperatures. The basin experienced slightly less than average precipitation over the previous week, with the exception of northern Minnesota. Temperatures across the basin are expected to be near or above average before plunging over the weekend. In the coming week, most of the basin will experience frigid temperatures with highs that are 10 to 15 degrees below average. The basin will likely see near-average precipitation for the coming week with most of the precipitation likely occurring before the coming workweek.

LAKE LEVEL CONDITIONS

Lakes Superior and Michigan-Huron are 9 and 21 inches, respectively, above their levels of a year ago. Lakes St. Clair and Erie are 6 and 6 inches, respectively, above what they were at this time last year. Lake Ontario is 4 inches below its level of a year ago.  Lakes Superior and Michigan-Huron are predicted to fall 2 and 1 inches, respectively, over the next month.  Lake St. Clair is projected to rise 15 inches during the next month, Lakes Erie is expected to rise by 2 inches, and Lake Ontario is expected to remain constant. Ice continues to build in the connecting channels, especially the St. Clair River. This build up of ice has restricted flow in the river and has caused the level of Lake St. Clair to recede. Water levels may fluctuate significantly while ice is present. 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 above average for the month of January.  Lake Michigan-Huron’s outflow into the St. Clair River and Lake St. Clair’s outflow into the Detroit River are projected to be above average in January.  In addition, the outflow of Lake Erie into the Niagara River and Lake Ontario’s outflow into the St. Lawrence River are predicted to be above average in January.

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. Ice information can be found at the National Ice Center’s website.

SUPERIOR

MICH-HURON

ST. CLAIR

ERIE

ONTARIO

Forecasted Water Level for Jan 30, 2015 (feet)

601.97

579.04

573.29

571.16

244.59

Chart Datum (feet)

601.10

577.50

572.30

569.20

243.30

Difference from chart datum (inches)

+10

+18

+12

+24

+15

Difference from average water level for Dec 30, 2014 (inches*)

-4

-2

-16

-3

+2

Difference from average water level for Jan 30, 2014 (inches*)

+9

+21

+6

+6

-4

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

+6

+8

-4

+4

0

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

-9

-27

-42

-30

-24

Year of highest recorded monthly mean

1986

1987

1986

1987

1946

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

+26

+36

+34

+35

+29

Year of lowest recorded monthly mean

1926

2013

1936

1935

1935

Projected change in levels by Mar 2, 2015 (inches)

-2

-1

+15

+2

0

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

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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.