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Also: Lake St. Clair
 

Great Lakes Levels and Hydrology
What's New | Current Levels | Weekly Levels Forecast | Related Resources
 
Levels & Hydrology Section: Home | Levels | Hydrology | Flows

 
What's New
Climate affects how the Great Lakes grow and flow
Great Lakes Echo (1/28)
New climate projections suggest increases in maximum and minimum daily temperatures in the Lake Michigan basin by as much as 8 degrees by 2099.

Great Lakes water levels to hit 20 year high
WDET - Detroit, MI (1/20)
Great Lakes water levels are predicted to rise nine inches above average this summer.

Great Lakes rebound, but rising tides pose problems
Detroit News (1/19)
The return of higher waters isn't necessarily welcomed by all.

Are the Great Lakes' levels normal?
Wisconsin State Journal (1/12)
For the first time in about 25 years, the water level of the all the Great Lakes is above normal. Lakes Superior, Michigan and Huron are about 5 inches above the long term average.

COMMENTARY: Time to save Lake Ontario
Watertown Daily Times (1/8)
A representative from The Nature Conservancy supports a new water levels management plan for Lake Ontario and the St. Lawrence River.

Higher water, speeding freighters result in property damage on Harsens Island
The Voice (1/6)
The water levels of the Great Lakes, whether low or high, can cause problems for landowners.

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Great Lakes Real-Time Water Level Gauging Stations

These maps were prepared in partnership with the National Oceanic & Atmospheric Administration (NOAA) and its Center for Operational Oceanographic Products and Services (CO-OPS).

NOAA Logo - Link to NOAA Website
Coordinating Committee Logo - Link to CC Website

Lake Superior | St. Marys River | Lake Michigan | Lake Huron | St. Clair River
Lake St. Clair | Detroit River | Lake Erie | Niagara River | Lake Ontario | St. Lawrence

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Weekly Water Levels Forecast
New! Update for Friday January 16, 2015 (includes data summary)

Weather conditions: The Great Lakes basin experienced below average temperatures over the previous week. Temperatures briefly rose to above average readings by Sunday or Monday in most areas, but returned to below normal by Wednesday. Light snow occurred throughout the week. Heavy snow occurred over the weekend in western Michigan, northern Illinois and Indiana, and moderate snow fell early in the week over Western New York and northern Ohio and Pennsylvania. Temperatures are predicted to be below normal through Wednesday, with another brief warm-up expected on Saturday in the Western portion of the basin and Sunday in the Eastern portion. Moderate snowfall is expected throughout the coming week, with the most snow occurring in the eastern portion of the Lake Ontario basin.

Weather Conditions: Lakes Superior and Michigan-Huron are 10 and 22 inches, respectively, above their levels of a year ago. Lakes St. Clair and Erie are 18 and 7 inches, respectively, above what they were at this time last year, while Lake Ontario is 4 inches below its level of a year ago. Lakes Superior and Michigan-Huron are predicted to fall 3 and 1 inches, respectively, over the next 30 days. In addition, Lake St. Clair is projected to remain at its current level during the next month, while Lakes Erie and Ontario are expected to rise 1 and 2 inches, respectively. Ice building in the connecting channels can cause significant water level fluctuations, especially in Lake St. Clair. See the Great Lakes Water Levels web page for more water level information.

Lake Level Conditions: Lakes Superior and Michigan-Huron are 10 and 22 inches, respectively, above their levels of a year ago. Lakes St. Clair and Erie are 18 and 7 inches, respectively, above what they were at this time last year, while Lake Ontario is 4 inches below its level of a year ago. Lakes Superior and Michigan-Huron are predicted to fall 3 and 1 inches, respectively, over the next 30 days. In addition, Lake St. Clair is projected to remain at its current level during the next month, while Lakes Erie and Ontario are expected to rise 1 and 2 inches, respectively. Ice building in the connecting channels can cause significant water level fluctuations, especially in Lake St. Clair. See the Daily Levels page for more water level information.

Forecasted outflows / channel conditions: Lake Superiorís outflow through the St. Maryís River is forecasted to be above average for the month of January. Lake Michigan-Huronís outflow into the St. Clair River and Lake St. Clairís outflow into the Detroit River are projected to be above average in January. In addition, the outflow of Lake Erie into the Niagara River and Lake Ontarioís outflow into the St. Lawrence River are predicted to be above average in January.

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. Ice information can be found at the National Ice Center's webpage.

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Related Resources
GLIN: Agencies and Organizations, Hydrology
GLIN: Current Great Lakes-St. Lawrence Water Levels
GLIN: Environmental Research in the Great Lakes Region
GLIN: Forecasted Great Lakes-St. Lawrence Water Levels
GLIN: Great Lakes-St. Lawrence Hydrology
GLIN: Great Lakes-St. Lawrence Water Flows
GLIN: Historical Great Lakes-St. Lawrence Water Levels
GLIN: Weather and Climate in the Great Lakes Region

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CC Data This page was created under the guidance of the binational Coordinating Committee on Great Lakes Basic Hydraulic and Hydrologic Data. This symbol is used throughout the GLIN hydrology section to indicate data or references prepared under the auspices of the Coordinating Committee.

 

 
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Updated: January 30, 2015
Maintained by: Christine Manninen, manninen@glc.org
Selected Photos: Copyright ©John and Ann Mahan
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