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Weekly Great Lakes Water Levels

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Weekly Forecast

WEEKLY GREAT LAKES WATER LEVEL UPDATE

Apr 29, 2016

 

WEATHER CONDITIONS

A week of variable temperatures has been the story for much of the Great Lakes Basin for the past week with the southern portions of the Lake Michigan basin swinging from 20 degrees above normal to nearly 15 degrees below normal. Eastern portions of the Great Lakes basin saw much less dramatic swings in temperature but still experienced some warm to cool temperature changes. Precipitation across the basin was also quite variable last week with portions of northern Lake Michigan and western Lake Superior receiving double or triple their average weekly rainfall for this time of year while portions of the Ontario and Erie basins received less than half their average rainfall. In the coming week temperatures should be more stable across the basin and most of the basin will see a good amount of sunshine. Temperatures are expected to be slightly cooler than normal for most of the basin. A chance for some rain exists for most of the basin with the heaviest amounts ocurring early in the week and on the southern shores of Lakes Erie and Ontario.

LAKE LEVEL CONDITIONS

Lake Superior is 2 inches higher than it was one month ago, but Lakes Michigan-Huron, Erie, and Ontario are all several inches higher than they were at this time last month.  Lake St. Clair is at the same level as last month. All lakes are above their average levels of a year ago. All of the lakes are forecasted to continue their seasonal rise for the next month. Over the next 30 days, the lakes are expected to rise 1 to 3 inches. 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 projected to be above average for the month of April. Lake Michigan-Huron’s outflow into the St. Clair River and Lake St. Clair’s outflow into the Detroit River are expected to be above average in April. Moreover, the April outflow of Lake Erie into the Niagara River is forecasted to be above average, and outflow of Lake Ontario into the St. Lawrence River is predicted to be above average in April.

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.

SUPERIOR

MICH-HURON

ST. CLAIR

ERIE

ONTARIO

Forecasted Water Level for Apr 29, 2016 (feet)

602.03

580.09

575.75

572.93

246.46

Chart Datum (feet)

601.10

577.50

572.30

569.20

243.30

Difference from chart datum (inches)

+11

+31

+41

+45

+38

Difference from average water level for Mar 29, 2016 (inches*)

+2

+6

0

+5

+4

Difference from average water level for Apr 29, 2015 (inches*)

+1

+10

+11

+14

+14

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

+10

+17

+18

+16

+9

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

-7

-17

-13

-14

-21

Year of highest recorded monthly mean

1986

1986

1986

1985

1973

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

31

47

46

49

43

Year of lowest recorded monthly mean

1926

1964

1926

1934

1935

Projected change in levels by May 29, 2016 (inches)

+3

+2

+2

+1

+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, 1918-2015

FORECASTED INFORMATION PROVIDED BY

RECORDED DATA (1918 – present)

FOR MORE INFORMATION VISIT

Department of the Army

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Detroit District, Corps of Engineers

NOAA, Great Lakes Online

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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.