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Weekly Great Lakes Water Levels

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Weekly Forecast

WEEKLY GREAT LAKES WATER LEVEL UPDATE

May 26, 2016

 

WEATHER CONDITIONS

Temperatures last Thursday leading into this week were average for most of the basin. Above average temperatures experienced Tuesday, Wednesday,  and today are expected to continue to next Thursday. Majority of the basin experienced lower than normal precipitations over the last seven days especially in the Lake Superior basin. Temperatures over the next seven days are expected to be at or above average throughout the basin. Scattered thunderstorms are expected over the holiday weekend with less than 1 inch of accumulation. Sunshine and continued above average temperatures are expected in the beginning of next week continuing through midweek.

LAKE LEVEL CONDITIONS

Lakes Superior and Erie are the same level as one month ago, Lakes Michigan-Huron and St. Clair are 1 inch higher than one month ago.  Conversely, Lake Ontario is 3 inches lower than one month ago. Levels on Lake Superior are 3 inches below the level of 1 year ago, while levels on the other lakes are all higher than levels of one year ago by at least 8 inches. Projections for the next month indicate a 2 inch rise in Lakes Superior and Michigan-Huron, a 1 inch rise in Lakes St. Clair and Ontario, and no change for Lake Erie. See our Daily Levels web page for more water level information.

FORECASTED MONTHLY OUTFLOWS/CHANNEL CONDITIONS

Just like the past several months, Lake Superior’s outflow through the St. Mary’s River is predicted to be above average in  May. Lake Michigan-Huron’s outflow into the St. Clair River and Lake St. Clair’s outflow into the Detroit River are forecasted to be above average for the month of May. Moreover, the May outflow of Lake Erie into the Niagara River is projected to be above average, and outflow of Lake Ontario into the St. Lawrence River is predicted to be above average in May.

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 May 20, 2016 (feet)

602.03

580.12

575.79

573.00

246.26

Chart Datum (feet)

601.10

577.50

572.30

569.20

243.30

Difference from chart datum (inches)

+11

+31

+42

+46

+36

Difference from average water level for Apr 20, 2016 (inches*)

0

+1

+1

0

-3

Difference from average water level for May 20, 2015 (inches*)

-3

+8

+11

+13

+9

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

+6

+14

+15

+14

+2

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

-9

-18

-13

-13

-26

Year of highest recorded monthly mean

1986

1986

1986

1986

1973

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

29

43

43

48

37

Year of lowest recorded monthly mean

1926

1964

1934

1934

1935

Projected change in levels by Jun 20, 2016 (inches)

+2

+2

+1

0

+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, 1918-2015

FORECASTED INFORMATION PROVIDED BY

RECORDED DATA (1918 – present)

FOR MORE INFORMATION VISIT

Department of the Army

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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.