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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 19, 2010
(includes data summary)
Weather conditions: High pressure and sunny skies brought unseasonably warm temperatures and spring-like weather across the Great Lakes basin this past week. Record high temperatures were recorded in several locations across the northern part of the basin. This Friday may be the last day of above average temperatures as a low pressure system makes its way into the basin. Look for cooler temperatures and a chance for rain and snow this weekend. The cool temperatures are expected to persist into next week. Water Level Conditions: Currently, Lakes Superior and Michigan-Huron are near their levels from 2009. Lake St. Clair is 7 inches below its level of a year ago while Lakes Erie and Ontario are 15 and 16 inches, respectively, below their levels of a year ago. Much of the difference between last year's and this year's levels of Lakes Erie and Ontario can be attributed to the significant amount of snow that fell in 2009 versus what has fallen this year. Over the next month, the water levels of Lakes Superior and Michigan-Huron are expected to increase by 1 and 2 inches respectively. Lake St. Clair is predicted to rise an inch over the next thirty days while Lakes Erie and Ontario are expected to rise approximately 5 and 6 inches, respectively, over the same timeframe. Over the next few months, all of the Great Lakes are expected to be below their levels of a year ago. See the USACE Daily Levels web page for more water level information. Forecasted water levels: The outflow from Lake Superior into the St. Mary's River is forecasted to be below average. The outflow from Lake Huron into the St. Clair River is forecasted to be near average. Near average flows are expected for the Detroit River and Niagara River. The St. Lawrence River is expected to have above average flows in March. 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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