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Weekly Great Lakes Water Levels

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Weekly Forecast

ARMY CORPS OF ENGINEERS WEEKLY GREAT LAKES WATER LEVEL UPDATE

Feb 23, 2018

 

WEATHER CONDITIONS

This past week temperatures during the day were below average, while night temperatures were above average across the basin.  Over the past week the majority of the basin received high amounts of precipitation, like northern Indiana which received 4-6 inches at the beginning of the week.  In response to precipitation, river flows increased in locations such as the Maumee River in Ohio and flood warnings were issued in cities such as Chicago.  Following expected showers this weekend, the upcoming week is expected to have temperatures in the 50s in most of the basin, excluding Lake Superior, where temperatures are expected to be colder.  The beginning of the week is forecasted to be dry, with a chance of showers starting Wednesday on the western portion of the basin and Wednesday night on the Eastern side.

LAKE LEVEL CONDITIONS

In the past month, water levels for Lakes Michigan-Huron, St. Clair, and Erie have risen by 1, 11 and 5 inches, respectively. Lake Superior declined by 3 inches since last month, and Lake Ontario remained at the same level.   Currently, water levels for all the Great Lakes remain above long-term average levels and higher than this time last year. Lake Superior continues to see water levels close to the record high February water level and is currently 2 inches below the record high from 1986. In the next month, Lake Superior is expected to decline an inch, while Lakes Michigan-Huron and St. Clair are expected to rise an inch.  Lake Erie and Lake Ontario are also expected to rise, by 5 and 2 inches, respectively. See our Daily Levels web page for more water level information.

FORECASTED MONTHLY OUTFLOWS/CHANNEL CONDITIONS

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

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 conditions can have a dramatic impact on actual channel depth and can lead to large short-term water level fluctuations website.

SUPERIOR

MICH-HURON

ST. CLAIR

ERIE

ONTARIO

Forecasted Water Level for Feb 23, 2018 (feet)

602.26

579.92

575.79

572.41

245.73

Chart Datum (feet)

601.10

577.50

572.30

569.20

243.30

Difference from chart datum (inches)

+14

+29

+42

+39

+29

Difference from average water level for Jan 23, 2018 (inches*)

-3

+1

+11

+5

0

Difference from average water level for Feb 23, 2017 (inches*)

+6

+11

+11

+2

+2

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

+12

+19

+28

+19

+12

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

-2

-14

-12

-12

-15

Year of highest recorded monthly mean

1986

1986

1986

1987

1952

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

32

46

63

51

44

Year of lowest recorded monthly mean

1926

1964

1926

1936

1936

Projected change in levels by Mar 23, 2018 (inches)

-1

+1

+1

+5

+2

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, 1918-2017

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.