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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

Jun 22, 2018

 

WEATHER CONDITIONS

The past week temperatures were above average throughout the Great Lakes basin.  Many parts of the basin received precipitation over the weekend and into early this week.  Of particular note, the western Lake Superior basin received heavy rainfall that resulted in major flooding and damage in northwestern Wisconsin and in Michigan’s Upper Peninsula, where Bayfield’s 3 Day rainfall total was over 15 inches and Hancock’s 24 hour rainfall total was shy of 7 inches.  Over the weekend there is a good chance of showers in the eastern half of the Great Lakes basin, and in early next week there is a likelihood of showers on the western half over the Lake Michigan basin and western Lake Superior.

LAKE LEVEL CONDITIONS

The water levels across the Great Lakes are above their long-term average levels for June. Lakes Michigan-Huron, St. Clair, and Erie are all above their levels from last year by 3 to 4 inches. Lake Superior is 5 inches below its level from last year, while Lake Ontario is 23 inches below last year when it reached its record high. In the last month, lakes Superior, Michigan-Huron and St. Clair rose 3, 2 and 1 inches, respectively, while lakes Erie and Ontario have declined 1 and 4 inches, respectively.  In the next month, lake Superior is forecasted to rise another inch, while lakes St. Clair, Erie and Ontario are forecasted to continue to fall, by 1, 3 and 4 inches, respectively. Lake Michigan-Huron is forecasted to remain at it’s current level into the next month.  See our Daily Levels web page for more water level information.

FORECASTED MONTHLY OUTFLOWS/CHANNEL CONDITIONS

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

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 Jun 22, 2018 (feet)

602.30

580.71

576.54

573.79

246.72

Chart Datum (feet)

601.10

577.50

572.30

569.20

243.30

Difference from chart datum (inches)

+14

+38

+51

+55

+41

Difference from average water level for May 22, 2018 (inches*)

+3

+2

+1

-1

-4

Difference from average water level for Jun 22, 2017 (inches*)

-5

+4

+4

+3

-23

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

+5

+18

+22

+22

+6

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

-7

-13

-7

-6

-24

Year of highest recorded monthly mean

1986

1986

1986

1986

2017

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

29

49

50

57

40

Year of lowest recorded monthly mean

1926

1964

1934

1934

1935

Projected change in levels by Jul 22, 2018 (inches)

+1

0

-1

-3

-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, 1918-2017

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.