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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
Great Lakes water levels: One lake to be almost 1 foot higher this summer
MLive (4/28)
The Great Lakes water levels forecasts show mixed expectations for this summer. One lake is expected to be much higher than last summer, while the other Great Lakes should be lower than last summer.

Lake Michigan reaches highest level since 1998
The Journal Times (4/22)
Lake Michiganís water level has officially rebounded from its historic low of 576 feet, recorded in January 2013.

Climate changes causes erosion concerns on Lake Huronís west coast
Blackburn News (4/20)
Coastal Resources Manager Geoff Peach explains that with a higher lake level, warmer temperatures, and more intense rainfall predicted for this summer, the threat of more severe erosion increases along the shoreline.

COMMENTARY: Low or high, Great Lakes water levels always blamed on global warming
Michigan Capitol Confidential (4/17)
Michigan legislators once tried restricting the sale of bottled water for fear of running out. Today, water levels are once again high and rising.

Feds eye Michigan for possible drought, but forecasters skeptical
MLive (4/16)
The National Weather Service's Climate Prediction Center highlighted much of lower Michigan and the far western portion of the Upper Peninsula in an area where drought development is likely now through the end of July.

Bay City state park officials hope high water levels mean less beach muck this year
MLive (4/7)
Bay City State Recreation Officials are hoping elevated water levels lead to another summer with low levels of muck and a high number of beach-goers along Michiganís Saginaw Bay.

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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 April 24, 2015 (includes data summary)

Weather conditions: Sunny skies and daily high temperatures in the 60's and 70's characterized the weather in the Great Lakes basin last weekend. However, temperatures began falling on Sunday, the skies became overcast, and heavy rain fell in many areas of the basin that day. Temperatures continued dropping through the workweek, as the daily high temperatures on Wednesday were around 30 degrees lower than what they had been during the weekend. Temperatures are expected to rise slightly this weekend, but will remain cooler than average into the coming workweek. Rain showers are predicted in the southwestern and south-central portion of the Great Lakes basin on Saturday.

Lake Level Conditions: Lakes Superior and Michigan-Huron are 7 and 17 inches, respectively, above what they were at this time last year. Lake St. Clair is 7 inches above its level of a year ago, while Lake Erie is 2 inches below last yearís level. Lake Ontario is 11 inches below its level of a year ago. Lakes Superior and Michigan-Huron are expected to rise 3 inches over the next month. Lakes St. Clair, Erie, and Ontario are projected to rise 4,5, and 7 inches, respectively, during the next 30 days. 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 April. Lake Michigan-Huronís outflow into the St. Clair River and Lake St. Clairís outflow into the Detroit River are predicted to be above average in April. The April outflow of Lake Erie into the Niagara River is forecast to be near average, but Lake Ontarioís outflow into the St. Lawrence River is predicted to be less than average in April.

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: May 4, 2015
Maintained by: Christine Manninen, manninen@glc.org
Selected Photos: Copyright ©John and Ann Mahan
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