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Current Great Lakes-St. Lawrence Water Levels Current Levels | Weekly Forecast | General Resources | Education | Laws | News | Reference | Related Resources Levels Section: Current | Forecasted | Historical Levels & Hydrology Section: Home | Levels | Hydrology | Flows 
Current Levels
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
Weekly Water Levels Forecast 
Update for Friday July 3, 2009
(includes data summary)
Weather conditions: Cloudy, cool and rainy conditions were experienced across much of the Great Lakes basin this week. Temperatures barely reached 60 degrees in some locations on Monday, Tuesday and Wednesday. Light rain and a few heavier showers were also reported throughout the week. The upcoming holiday weekend looks very nice, with more seasonable temperatures and increasing sunshine. Water Level Conditions: Lake Superior is 1 inch below the level it was a year ago while Lakes Michigan-Huron, St. Clair, and Erie are 10, 5, and 4 inches, respectively, higher than their levels of a year ago. Lake Ontario is at the same level it was a year ago. Lake Superior is expected to rise 2 inches over the next month, while Lake Michigan-Huron is predicted to remain steady. Lakes St. Clair, Erie and Ontario are predicted to decline 3 to 5 inches over the next 30 days. Over the next several months, Lake Superior is predicted to be near its level of a year ago. Lakes Michigan-Huron, St. Clair, and Erie are forecasted to remain at or above last year's levels. Lake Ontario is forecasted to be at or below its levels of a year ago over the next six months. See the USACE Daily Levels web page for more water level information. Current outflows / channel conditions: In June, the outflow from Lake Superior through the St. Mary's River was near average, while the outflow from Lake Michigan-Huron through the St. Clair River was below average. The Detroit and Niagara Rivers carried near average flows during June. The outflow from Lake Ontario through the St. Lawrence River was above average. Alerts: 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.
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.
Education 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.
Laws The Great Lakes Charter: Principles for the Management of Great Lakes Water Resources Council of Great Lakes Governors
News Advisor Great Lakes Commission Focus International Joint Commission LEVEL News 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.
References 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.
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
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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