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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 April 26, 2013
(includes data summary)
Weather conditions: Wet conditions continued across the Great Lakes basin this week due to heavy rain, wet soil conditions, and continued snow melting in the northern areas. Overall, the basin has received 180% of average precipitation for the month of April, with the Michigan-Huron basin receiving over 200% of average. Temperatures dropped below average on Wednesday and Thursday but are expected to warm up over the weekend. Expect low chances of precipitation over the weekend with above average temperatures heading into next week. Water Level Conditions: The water levels of the Great Lakes have risen significantly over the past month. Lakes Superior and Michigan-Huron are 2 and 7 inches, respectively, lower than their levels of a year ago. Lakes St. Clair, Erie, and Ontario are 6, 8, and 3 inches, respectively, lower than at this time last year. Over the next month, Lakes Superior and Michigan-Huron are both forecasted to rise 3 inches. The water levels of lakes St. Clair, Erie, and Ontario are expected to rise 1, 2, and 3 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 April. 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 April. 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 April. 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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