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Great Lakes Levels and Hydrology
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 May 11, 2012
(includes data summary)
Weather conditions: The Great Lakes basin has experienced substantial precipitation so far for the month of May, especially in the Michigan-Huron, Erie and Ontario basins. Temperatures were near seasonal averages across the region this past week. Pleasant weather and seasonal temperatures are expected in the Great Lakes basin this weekend, with a few scattered showers and thunderstorms possible in parts of the basin. Water Level Conditions: Lake Superior is 1 inch higher than it was last year and Lake Michigan-Huron is at its level of a year ago. Lakes St. Clair, Erie, and Ontario are 2, 4, and 9 inches, respectively, lower than a year ago. Over the next month, Lakes Superior and Michigan-Huron are forecasted to rise 3 and 2 inches, respectively, from their current levels. The water levels of Lakes St. Clair and Erie are both expected to fall 1 inch, while the level of Lake Ontario is expected to rise 1 inch over the next thirty days. See the Daily Levels web page for more water level information. Forecasted outflows / channel conditions: Lake Superior's outflow through the St. Marys River is projected to be below average for the month of May. Lake Huron's outflow into the St. Clair River and the outflow from Lake St. Clair into the Detroit River are expected to be below average throughout the month of May. Lake Erie's outflow through the Niagara River is forecasted to be above average and the outflow of Lake Ontario into the St. Lawrence River is predicted to be below average in May. Alerts: The water level of Lake Superior is below chart datum and is forecasted to remain below chart datum through July. 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.
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
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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