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  Current Great Lakes-St. Lawrence Water Levels
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Levels Section: Current | Forecasted | Historical
Levels & Hydrology Section: Home | Levels | Hydrology | Flows

Current Levels

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

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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 November 20, 2015 (includes data summary)

Weather conditions: Temperatures throughout the Great Lakes basin were near average at the beginning of last weekend. However, they rose during the weekend, and the vast majority of the basin experienced temperatures that were more than 10 degrees above normal on Sunday. Temperatures continued to climb during the workweek, and the average temperature on Wednesday in many cities, such as Cleveland, OH and Duluth, MN, was more than 20 degrees above average. To date, Lakes Erie and Ontario have experienced significantly below average precipitation this month. This weekend, temperatures will start out around average on Friday, and will drop through Sunday. Cities such as Chicago, IL and Kalamazoo, MI are projected to experience high temperatures on Sunday not exceeding 30 degrees. On Monday, the basin will experience moderate temperatures. Considerable precipitation in the form of snow in the northern part of the basin, rain/snow mix in the central part, and rain in the southern part, is expected on Saturday. On Sunday, snow is expected in much of the basin.

Lake Level Conditions: Lake Superior is 3 inches below its level of a year ago, while Lake Michigan-Huron is an inch above last yearís level. The level of Lakes St. Clair, Erie and Ontario are both 4 to 5 inches above what they were at this time last year. The water levels of Lakes Superior and Michigan-Huron are at the same level as they were a month ago, while Lakes St. Clair, Erie, and Ontario are 4,2, and 3 inches, respectively, lower than they were. Over the next 30 days, all lakes, with the exception of Lake St. Clair are expected to continue their seasonal decline. Lakes Superior and Michigan-Huron are predicted to fall 3 and 2 inches, respectively, while Lakes Erie and Ontario are both forecasted to decline 2 inches. Levels will remain above their long term average levels for this time of year, although Lake Ontario appears to be approaching its average level currently. See the Daily Levels page for more water level information.

Forecasted outflows / channel conditions: Lake Superiorís outflow through the St. Maryís River is predicted to be above average for the month of October. Lake Michigan-Huronís outflow into the St. Clair River and Lake St. Clairís outflow into the Detroit River are forecasted to be above average in October. Likewise, the October outflow of Lake Erie into the Niagara River is projected to be above average, and Lake Ontarioís outflow into the St. Lawrence River is expected 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. Ice information can be found at the National Ice Center's webpage.

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General Resources
Current Month's Daily Lake Averages
U.S. Army Corps of Engineers (USACE), Detroit District
This page displays tabular average Great Lakes water level data for the past four months. You can view the information in feet or meters.

Great Lakes Water Level Photo Gallery
GLERL / Great Lakes Sea Grant Extension Office
Geographically organized, this gallery features both current and historical coastal images and links to related water level updates.

Great Lakes Water Levels
NOAA, Great Lakes Environmental Research Laboratory (GLERL)
Includes historical hydrographs illustrating monthly water levels 1860-present, as well as information about the current situation and the year's outlook.

Hourly Station Levels
Department of Fisheries and Oceans (DFO), Canadian Hydrographic Service
CHS gauging stations' hourly water levels data and graphs for the past and current month. Elevation in meters above chart datum, referenced to IGLD (1985). Data are provisional.

Recent and Forecasted Water Levels on the Great Lakes
Department of Fisheries and Oceans (DFO), Canadian Hydrographic Service
Includes average monthly water levels for the previous year and the current year to date. Period of record is 1918-1996. Elevations are in meters referred to chart datum and IGLD (1985).

Tides and Water Levels
Department of Fisheries and Oceans (DFO), Marine Environmental Data Service
Provides last daily and latest weekly averages. Elevations are in meters IGLD.

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TEACH Great Lakes: Water Levels
Water levels are part of the ebb and flow of nature. Learn about the three types of water level fluctuations, how levels are measured on the Great Lakes, and what's causing the recent drop.

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The Great Lakes Charter: Principles for the Management of Great Lakes Water Resources
Council of Great Lakes Governors

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Great Lakes Commission

International Joint Commission

Environment Canada, Water Issues Division, Great Lakes-St. Lawrence Regulation Office
Features articles each month about water levels of the Great Lakes and St. Lawrence.

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Great Lakes Water Levels Home Page
U.S. Army Corps of Engineers (USACE), Detroit District
A regularly updated page of links to information on Great Lakes hydrology. Includes current conditions, recent water levels, forecasted levels, general news and information, multimedia, reference materials, and more!

Great Lakes Water Level Photo Gallery
GLERL / Great Lakes Sea Grant Extension Office
Geographically organized, this gallery features both current and historical coastal images and links to related water level updates.

Living with the Lakes
U.S. Army Corps of Engineers/Great Lakes Commission
This 40-page full-color publication offers a thorough overview of water \r\nlevel changes, impacts and regulation, as well as advice on shoreline \r\nprotection. Published jointly by the U.S. Army Corps of Engineers-Detroit District and the Great Lakes Commission.

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Related Resources
GLIN: Agencies and Organizations, Hydrology
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 28, 2015
Selected Photos: Copyright ©John and Ann Mahan
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