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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 March 29, 2013
(includes data summary)
Weather conditions: The Great Lakes basin recorded very little precipitation this week and temperatures were generally below normal. However, above normal temperatures are expected to move into the area for the first time this spring. A rain and snow mix is expected to fall towards the end of the weekend. The new work week is expected to see temperatures rebound back to their seasonal average as the precipitation exits the area. Water Level Conditions: The water level of Lake Superior is 4 inches below its level of one year ago, while Lake Michigan-Huron is 15 inches lower. Lakes St. Clair, Erie, and Ontario are 15, 17, and 15 inches, respectively, lower than their levels of a year ago. Over the next month, Lakes Superior and Michigan-Huron are forecasted to rise 3 and 4 inches, respectively. The water levels of Lakes St. Clair, Erie and Ontario are expected to increase 5, 5 and 7 inches, respectively, over the next thirty days. See the Great Lakes Water 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 March. Lake Huron’s outflow into the St. Clair River and the outflow from Lake St. Clair into the Detroit River are also expected to be below average throughout the month of March. Lake Erie’s outflow through the Niagara River is predicted to be below average and the outflow of Lake Ontario into the St. Lawrence River is expected to be below average in March. Alerts: Official records are based on monthly average water levels and not daily water levels. Lake Superior and Lake Michigan-Huron are below chart datum. 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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