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Great Lakes Levels and Hydrology
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Levels & Hydrology Section: Home | Levels | Hydrology | Flows

What's New
Waukesha predicts $206M Lake Michigan water project done by 2020, two years late
Milwaukee Business Journal (11/20)
Waukesha, Wis., is likely to miss its court-ordered 2018 deadline to secure a new source of drinking water, and instead would complete a planned $206 million system to tap Lake Michigan in 2020.

Coalition urges adoption of regulation plan for Lake Ontario, St. Lawrence River
Watertown Daily Times (11/13)
A coalition of elected officials and environmental and business interests is urging the U.S. and Canadian governments to stop delaying the implementation of a new plan to regulate the flows of Lake Ontario and the St. Lawrence River.

Raging Lake Michigan waves bring New Buffalo home to the brink
Harbor Country News (11/12)
With a double whammy of 60-mph wind gusts and 20-plus-foot waves in recent weeks, some areas along the Great Lakes shoreline have endured the worst beating in years.

November wild on Great Lakes; water levels back up
Cheboygan Daily Tribune (11/11)
The Witch Of November is a seafaring term coined from the combination of weather conditions that have produced the worst month for loss of life on the Great Lakes during storms that often last for days and create waves that have gone as high as 35 feet.

Water levels bounce back in Georgian Bay
Wasaga Sun (11/10)
In Lake Huron, which includes Georgian Bay, Ontario, the water level remains a half-metre (20 inches) above chart datum of 176 metres.

Erosion concerns after big waves hit St. Joseph, Michigan
WSBT-TV - Mishawaka, IN (11/6)
For the second time in one week, waves on Lake Michigan exceeded what is normal for this time of year, causing erosion concerns.

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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 October 24, 2014 (includes data summary)

Weather conditions: Temperatures in the Great Lakes basin have oscillated between above average and below average during the past 7 days. Notable precipitation took place throughout much of the basin last weekend and on Monday. This weekend, temperatures in the region are predicted to be generally above average. These above average temperatures will continue into the early part of the workweek when several cities including Chicago, IL, and Flint, MI, will see temperatures over ten degrees above average on Monday. Rain showers are forecasted for the majority of the basin on Sunday and Monday.

Water Level Conditions: Lakes Superior and Michigan-Huron are both 10 and 22 inches, respectively, above their levels of a year ago. Lakes St. Clair and Erie are 8 and 16 inches, respectively, above what they were at this time last year while Lake Ontario is 2 inches below its level of a year ago. Lakes Superior and Michigan-Huron are both predicted to decline 2 inches over the next 30 days. Lakes St. Clair, Erie and Ontario are projected to fall 3 to 4 inches over the next month. 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 October. Lake Michigan-Huronís outflow into the St. Clair River is predicted to be near average, while Lake St. Clairís outflow into the Detroit River is predicted to be above average in October. 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 October.

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: November 21, 2014
Maintained by: Christine Manninen, manninen@glc.org
Selected Photos: Copyright ©John and Ann Mahan
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