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Weekly Forecast

ARMY CORPS OF ENGINEERS WEEKLY GREAT LAKES WATER LEVEL UPDATE

Jun 14, 2024

 

       

WEATHER CONDITIONS

Last week temperatures remained near normal in the 60s and 70s Fahrenheit with temperatures sneaking into the 80s over the past few days in the western Great Lakes basin. Most of the basin received precipitation during the last week with the majority occurring in the Lake Erie and Lake Ontario regions. The basin will continue to see sporadic rain events over the next week with the most occurring in the Lake Superior region. A large heat wave will hit the basin starting early next week and sticking around for multiple days. Temperatures are expected to be in the 90s Fahrenheit with heat indices up to near 100 degrees Fahrenheit. Part of the basin including Southern Michigan, Indiana, and Ohio could experience extreme heat and should take necessary precautions.

LAKE LEVEL CONDITIONS

The predicted June 14th lake levels for Lakes Superior, Michigan-Huron, and St. Clair are 2 to 3 inches above their levels of a month ago, while Lakes Erie and Ontario are within an inch of what they were last month. Lakes Superior and Ontario are 11 and 12 inches lower than their respective levels last year, while Lake Michigan-Huron is 2 inches lower, Lake St. Clair is near the same level, and Lake Erie is one inch above. All lakes are well above their record low June levels, with the closest being Lake Superior at 22 inches higher and the largest difference at Lake Erie at 46 inches higher. Additionally, all lakes are within 10 inches of their respective long-term monthly average June levels. By July 14th, Lakes Superior and Michigan-Huron are expected to rise 2 inches and 1 inch, respectively. Lakes St. Clair, Erie, and Ontario are expected to fall 2, 2, and 1 inch in the next month. For more information, please see our Daily Levels web page.

FORECASTED MONTHLY OUTFLOWS/CHANNEL CONDITIONS

Lake Superior’s outflow into the St. Marys River is expected to be slightly below average for June.  Lake Michigan-Huron’s outflow through the St. Clair River and Lake St. Clair’s outflow into the Detroit River are projected to be slightly above average for June. Lake Erie’s outflow through the Niagara River, and Lake Ontario’s outflow from the St. Lawrence River are projected to be above average in June.

ALERTS

Water levels shown are still-water surface elevations over the entire lake surface. Water levels at specific locations may differ due to meteorological influences. Official records are based on monthly average water levels and not daily water levels. Great Lakes, connecting channels, and St. Lawrence River users should keep informed of current conditions before undertaking any activities affected by changing water levels. Mariners should use navigation charts and refer to current water level readings.

SUPERIOR

MICH-HURON

ST. CLAIR

ERIE

ONTARIO

Forecasted Water Level for Jun 14, 2024 (feet)

601.71

579.53

575.66

572.90

245.87

Chart Datum (feet)

601.10

577.50

572.30

569.20

243.30

Difference from chart datum (inches)

+7

+24

+40

+44

+31

Difference from average water level for May 14, 2024 (inches*)

+3

+2

+3

0

-1

Difference from average water level for Jun 14, 2023 (inches*)

-11

-2

0

+1

-12

 

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

-2

+3

+10

+10

-5

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

-17

-31

-22

-20

-38

Year of highest recorded monthly mean

2019

2020

2020

2019

2019

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

+22

+35

+40

+46

+30

Year of lowest recorded monthly mean

1926

1964

1934

1934

1935

 

Projected net change in levels by Jul 14, 2024 (inches)

+2

+1

-2

-2

-1

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, 1918-2023

FORECASTED INFORMATION PROVIDED BY

RECORDED DATA (1918 – present)

FOR MORE INFORMATION VISIT

Department of the Army

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Detroit District Great Lakes Homepage

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1-888-694-8313 ext. 1

 

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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 and will be posted by close of business on Friday.

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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 Construction Division, Hydraulics and Hydrology Branch, 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.