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Weekly Great Lakes Water Levels

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Weekly Forecast

WEEKLY GREAT LAKES WATER LEVEL UPDATE

April 18, 2014

 

WEATHER CONDITIONS

Heavy rainfall impacted the Michigan-Huron basin last weekend, while another winter storm brought significant snow to the Lake Superior basin on Wednesday and Thursday.  The heavy rain pushed many rivers in central lower Michigan above flood stage and the additional snow may add to the flood threat across the northern portions of the basin.  Temperature continued to be cooler than average across the lakes.  Looking ahead into the weekend, another storm system is poised to bring more rain to the region, but warmer temperature should accompany the rainfall.

LAKE LEVEL CONDITIONS

Lakes Superior and Michigan-Huron are both 13 inches above their levels of a year ago.   Lakes St. Clair, Erie and Ontario are 7, 9, and 5 inches, respectively, above what their level was this time last year. Lakes Superior and Michigan-Huron are predicted to climb 4 inches each over the next 30 days. Lakes St. Clair and Erie are both projected to rise 4 and 2 inches, respectively in the next month, while Lake Ontario will rise 4 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 predicted to be above average for the month of April.  Lake Michigan-Huron’s outflow into the St. Clair River is predicted to be below average, while Lake St. Clair’s outflow into the Detroit River is expected to be near average.  In addition, the outflow of Lake Erie into the Niagara River and Lake Ontario’s outflow into the St. Lawrence River are projected to be near average in April.

ALERTS

Official records are based on monthly average water levels and not daily water levels.  Lake Michigan‑Huron is below chart datum. 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. Ice information can be found at the National Ice Center’s website.

SUPERIOR

MICH-HURON

ST. CLAIR

ERIE

ONTARIO

Forecasted Water Level for Apr 18, 2014 (feet)

601.25

577.79

574.15

571.78

245.73

Chart Datum (feet)

601.10

577.50

572.30

569.20

243.30

Difference from chart datum (inches)

+2

+3

+22

+31

+29

Difference from average water level for Mar 18, 2014 (inches*)

+2

+7

+7

+11

+14

Difference from average water level for Apr 18, 2013 (inches*)

+13

+13

+7

+9

+5

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

0

-11

-1

+2

+1

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

-17

-44

-32

-28

-30

Year of highest recorded monthly mean

1986

1986

1986

1985

1973

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

+21

+20

+27

+35

+34

Year of lowest recorded monthly mean

1926

1964

1926

1934

1935

Projected change in levels by May 18, 2014 (inches)

+4

+4

+4

+2

+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, 1918-2013

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

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.