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Weekly Forecast

ARMY CORPS OF ENGINEERS WEEKLY GREAT LAKES WATER LEVEL UPDATE

Aug 12, 2022

 

       

WEATHER CONDITIONS

Over the past week, most places throughout the basin have experienced temperatures transition from well above normal to near or slightly below normal for this time of year. The more seasonable temperatures are forecast to continue in the coming week. A cold front moved across the Great Lakes basin towards the end of the weekend and into the early work week that brought heavy rain to some areas of the basin. The coming week is forecast to be fairly dry across the region with the chance of isolated showers.

LAKE LEVEL CONDITIONS

Forecasted water levels for August 12th indicate that Lake Superior is 1 inch above its water level from a month ago and Lake Michigan-Huron is near its level from last month. Lakes St. Clair, Erie, and Ontario are all below their levels from a month ago by 1, 1, and 6 inches, respectively. The forecasted water levels for August 12th also show that water levels are below last year’s levels on all lakes besides, Lake Superior, which is 4 inches above its level from last year. Also, the forecasted water levels are above their August long-term average level by 4 to 13 inches on Lakes Superior, Michigan-Huron, St. Clair, and Erie. Lake Ontario is below its August monthly average water level by 4 inches. By September 12th, water levels are forecast to decline on Lakes Michigan-Huron, St. Clair, Erie, and Ontario by 2, 3, 4, and 7 inches, respectively. Lake Superior is forecast to be near its current level in one month. See our Daily Levels web page for more water level information. See our Daily Levels web page for more water level information.

FORECASTED MONTHLY OUTFLOWS/CHANNEL CONDITIONS

Forecasts show Lake Superior’s outflow through the St. Marys River, Lake Michigan-Huron’s outflow through St. Clair River, Lake St. Clair’s outflow through Detroit River, Lake Erie’s outflow through Niagara River, and Lake Ontario’s outflow through St. Lawrence River will be above average in August.

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 Aug 12, 2022 (feet)

602.53

580.09

575.82

572.74

245.37

Chart Datum (feet)

601.10

577.50

572.30

569.20

243.30

Difference from chart datum (inches)

+17

+31

+42

+42

+25

Difference from average water level for Jul 12, 2022 (inches*)

+1

0

-1

-1

-6

Difference from average water level for Aug 12, 2021 (inches*)

+4

-9

-8

-9

-3

 

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

+4

+9

+13

+11

-4

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

-8

-24

-18

-18

-31

Year of highest recorded monthly mean

2019

2020

2020

2019

1947

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

+25

+41

+43

+45

+31

Year of lowest recorded monthly mean

2007

1964

1934

1934

1934

 

Projected net change in levels by Sep 12, 2022 (inches)

0

-2

-3

-4

-7

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, 1918-2021

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 on Thursday afternoon or Friday morning depending on data availability.

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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.