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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 August 28, 2015 (includes data summary)

Weather conditions: The past 7 days were a break from the heat of the previous week, with below normal temperatures over much of the basin, except the Lake Ontario basin where temperatures ranged from 2°F below to 4°F above normal. Precipitation amounts ranged from about 0.75 inches below normal over much of the Lake Michigan basin to up to 1.5 inches above normal over the Lake Superior basin and parts of the Lake Huron, Erie, and Ontario basins. Runoff over the last 7 days has been within the normal to above normal range for this time of year. Warmer temperatures are expected to return over the weekend, with highs reaching the upper 80s in the southern portion of the basin by Tuesday and continuing into Wednesday. The 7-day precipitation forecast calls for total rainfall amounts of over an inch in southwest Wisconsin and parts of southern Michigan on Friday and Saturday, but lower amounts across the rest of the basin and little precipitation for the remainder of the week.

Lake Level Conditions: A brief rise on Lake Superior over the last 3 days interrupted its normal seasonal decline, and as a result, the forecast shows Lake Superior starting at 602.69 ft, one inch above its level of 30 days ago. All other lakes are at lower levels than this time last month. All lakes are above their levels of one year ago. Lake Superior is 1 inch above last year’s level, Lake Michigan-Huron is 9 inches above last year’s level, Lake Erie is 8 inches above, and Lakes St. Clair and Ontario are both 6 inches above last year’s levels. Over the next 30 days, Lakes Superior is projected to fall 1 inch and Lake Michigan-Huron is expected to fall 2 inches in the same period. Water levels in Lakes St. Clair, Erie, and Ontario are predicted to drop 3, 5, and 8 inches, respectively. See the Daily Levels page for more water level information.

Forecasted outflows / channel conditions: Lake Superior’s outflow through the St. Mary’s River is predicted to be above average for the month of August. Lake Michigan-Huron’s outflow into the St. Clair River and Lake St. Clair’s outflow into the Detroit River are forecasted to be near average in August. The August outflow of Lake Erie into the Niagara River is projected to be above average, and Lake Ontario’s outflow into the St. Lawrence River is expected to be above average in August.

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: September 5, 2015
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