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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 February 5, 2010
(includes data summary)
Weather conditions: Arctic air continues to invade the Great Lakes Basin keeping temperatures below freezing. A few areas experienced light snow showers during the last few days with accumulations totaling less than an inch. The current weather pattern is keeping major storm systems to the south of the Great Lakes basin. Looking forward to the upcoming weekend, cold temperatures will persist with some areas seeing light snow showers. Water Level Conditions: Currently, Lakes Superior and Michigan-Huron are 3 and 5 inches, respectively, higher than their levels last year at this time. Lakes St. Clair is 5 inches below its level of a year ago, while Lake Erie remains near last years level. Lake Ontario is 8 inches below its level of a year ago. The water level of Lake Superior is expected to decline by 2 inches, over the next month, while Lake Michigan-Huron will remain steady. The water levels of Lake St. Clair, Lake Erie and Lake Ontario are expected to increase by 4, 2 and 1 inches, respectively, over the next month. Over the next few months, Lake Superior and Lake Michigan-Huron are forecasted to be above their water levels of a year ago. Lakes St. Clair, Erie and Ontario are forecasted to remain below last year's levels over the same time period. See the USACE Daily Levels web page for more water level information. Current outflows / channel conditions: The outflow from Lake Superior into the St. Marys River is forecasted to be below average. The outflow from Lake Huron into the St. Clair River is forecasted to be near average. Above average flows are expected for the Detroit River, Niagara River, and St. Lawrence River. Ice build-up in the connecting channels can greatly affect flows and may cause significant fluctuations in water levels. 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.
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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