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Weekly Forecast

ARMY CORPS OF ENGINEERS WEEKLY GREAT LAKES WATER LEVEL UPDATE

Apr 19, 2024

 

       

WEATHER CONDITIONS

Over the last week, temperatures across the Great Lakes basin have been above seasonal average. Areas on the western side of the basin saw the greatest departure from normal as temperatures rose to 10⁰ F above average. Most of the Great Lakes basin received precipitation during the week in the range of 0.5 to an 1.0 inch. Looking at weekend weather, northern Michigan, Wisconsin, and Minnesota are expected to receive mixed precipitation until early Saturday while areas east of Lakes Ontario and Erie have a chance of rain all day Saturday. Temperatures are anticipated to drop on Saturday before rising on Sunday and carrying into early next week. Rain is expected to be sweeping west to east across the basin starting mid-day Monday until late Wednesday.

LAKE LEVEL CONDITIONS

The forecasted April 19th water levels are above those of this time in March for all lakes. Lakes St. Clair, Erie and Ontario are projected to be 6 to 7 inches higher than the previous month, while Lakes Superior and Michigan-Huron are 1 and 3 inches above, respectively. Lakes Superior, Michigan-Huron, Erie, and Ontario are forecast to be below their levels from last year, ranging from 11 inches below for Superior to one inch below for Erie. Lake St. Clair is projected to be above the average water level from last year at this time by one inch. The forecasted water level for April 19th is above the long-term average for Lakes St. Clair and Erie by 12 and 14 inches respectively, while Michigan-Huron and Ontario are 2 and 1 inch above. Lake Superior is projected to be one inch below the long-term average for April. By next month, water levels on Lakes Superior, Michigan-Huron and Ontario are forecast to increase by 3 to 4 inches while Erie is projected to stay the same and St. Clair to decrease by 1 inch. See our Daily Levels web page for more water level information.

FORECASTED MONTHLY OUTFLOWS/CHANNEL CONDITIONS

Lake Superior’s outflow into the St. Mary’s River is expected to be slightly below average for April.  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 April. 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 April.

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. Find ice information at National Ice Center’s website.

SUPERIOR

MICH-HURON

ST. CLAIR

ERIE

ONTARIO

Forecasted Water Level for Apr 19, 2024 (feet)

601.18

578.94

575.43

572.87

245.77

Chart Datum (feet)

601.10

577.50

572.30

569.20

243.30

Difference from chart datum (inches)

+1

+17

+38

+44

+30

Difference from average water level for Mar 19, 2024 (inches*)

+1

+3

+7

+7

+6

Difference from average water level for Apr 19, 2023 (inches*)

-11

-4

+1

-1

-9

 

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

-1

+2

+12

+14

+1

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

-17

-33

-20

-17

-29

Year of highest recorded monthly mean

1986

2020

2020

2020

1973

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

+20

+33

+42

+48

+35

Year of lowest recorded monthly mean

1926

1964

1926

1934

1935

 

Projected net change in levels by May 19, 2024 (inches)

+3

+3

-1

0

+4

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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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.