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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
St. Lawrence, Lake Ontario levels debate moves to Washington
North Country Public Radio (9/17)
The effort to update the 55-year-old plan for managing water levels on the St. Lawrence River and Lake Ontario in Northern New York is coming to a close.

Water levels in the Great Lakes are up in 2014
The London Free Press (9/17)
Water levels in the Great Lakes are up this year, thanks to an abundance of rainfall. Itís a welcome rebound ó levels havenít been this high since 1999.

Monroe, Wayne County, N.Y. leaders blast lake level plan
Democrat & Chronicle (9/17)
Top leaders from Monroe and Wayne counties in N.Y. voiced their strong opposition to a plan that would change regulatory guidelines for the Lake Ontario and St. Lawrence River highs and lows.

St. Lawrence, Lake Ontario levels debate moves to Washington
North Country Public Radio (9/17)
The effort to update the 55-year-old plan for managing water levels on the St. Lawrence River and Lake Ontario in Northern New York is coming to a close.

Lake Michigan levels rise above average
WXMI-TV - Grand Rapids, MI (9/13)
After a few years of below average lake levels, Lake Michigan is starting to slowly rebound.

Lake Huron surpasses 95-year average
The Manitoulin Expositor (9/10)
Water levels on Lakes Huron and Michigan have surpassed the 95-year average for September with no signs of slowing down just yet.

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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 September 12, 2014 (includes data summary)

Weather conditions: A strong storm system ripped through the Great Lakes basin this week, bringing more heavy rain, strong winds, and large waves on the lakes themselves. Many locations received more than 2 inches of rain Wednesday and wave heights on Lake Superior topped 14 feet. Much cooler air filtered into the region in the wake of the storm system. More showers are possible late Friday and into Saturday, before the sun returns on Sunday. To date in September, the Great Lakes basin as a whole has received almost double its average precipitation.

Water Level Conditions: Lakes Superior and Michigan-Huron are 8 and 19 inches, respectively, above their levels of a year ago. Lakes St. Clair and Erie are 11 and 6 inches, respectively, above what they were at this time last year, while Lake Ontario is at the same level as a year ago. Lakes Superior and Michigan-Huron are both each predicted to fall an inch over the next month. Lakes St. Clair, Erie, and Ontario are projected to fall 4, 4, and 7 inches, respectively, over the next 30 days. See the Great Lakes Water Levels web page for more water level information.

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

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.

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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: September 22, 2014
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Selected Photos: Copyright ©John and Ann Mahan
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